Early partition table support

Adding infrastructure for partition table support. Backward compatible. Not ready for end user usage yet. Bumped version to 3.1.1 to demarcate this change.
6 years ago · ee0fac37f9
26 changed files with 2164 additions and 996 deletions
--- a/Binary/Clean.cmd
+++ b/Binary/Clean.cmd
@ -2,6 +2,7 @@
 setlocal
 if exist *.bin del *.bin
 if exist *.dat del *.dat
 if exist *.com del *.com
 if exist *.img del *.img
 if exist *.rom del *.rom
--- a/Doc/ChangeLog.txt
+++ b/Doc/ChangeLog.txt
@ -1,3 +1,8 @@
 Version 3.1.1
 -------------
 - WBW: Version bumped due to pervasive changes
 - WBW: Preliminary support for hard disk partition support (backward compatible)
 Version 3.1
 -----------
 - WBW: Refactored ROM Loader
--- a/Source/Apps/Assign.asm
+++ b/Source/Apps/Assign.asm
@ -22,7 +22,8 @@
 ;   2016-04-08 [WBW] Determine key memory addresses dynamically
 ;   2019-08-07 [WBW] Fixed DPB selection error
 ;   2019-11-17 [WBW] Added preliminary CP/M 3 support
 ;   2019-12-24 [WBW] Fixed location of BIOS save area
 ;   2019-12-24 [WBW] Fixed location of BIOS save area\
 ;   2020-04-29 [WBW] Updated for larger DPH (16 -> 20 bytes)
 ;_______________________________________________________________________________
 ;
 ; ToDo:
@ -546,7 +547,8 @@ dph_init2:
 	ld	a,(hl)		; unit to A
 	push	bc		; save loop control
 	push	hl		; save drive map pointer
 	ld	hl,16		; size of a DPH structure
 	;ld	hl,16		; size of a DPH structure
 	ld	hl,20		; size of a DPH structure
 	call	alloc		; allocate space for dph
 	jp	c,instovf	; handle overflow error
 	push	hl		; save DPH location
@ -1866,10 +1868,10 @@ stack	.equ	$		; stack top
 ; Messages
 ;
 indent	.db	"   ",0
 msgban1	.db	"ASSIGN v1.1a for RomWBW CP/M, 24-Dec-2019",0
 msgban1	.db	"ASSIGN v1.1b for RomWBW CP/M, 29-Apr-2020",0
 msghb	.db	" (HBIOS Mode)",0
 msgub	.db	" (UBIOS Mode)",0
 msgban2	.db	"Copyright 2019, Wayne Warthen, GNU GPL v3",0
 msgban2	.db	"Copyright 2020, Wayne Warthen, GNU GPL v3",0
 msguse	.db	"Usage: ASSIGN D:[=[{D:|<device>[<unitnum>]:[<slicenum>]}]][,...]",13,10
 	.db	"  ex. ASSIGN           (display all active assignments)",13,10
 	.db	"      ASSIGN /?        (display version and usage)",13,10
--- a/Source/Apps/Timer.asm
+++ b/Source/Apps/Timer.asm
@ -41,8 +41,11 @@ rmn	.equ	1		; intended CBIOS version - minor
 ;
 bf_sysver	.equ	$F1	; BIOS: VER function
 bf_sysget	.equ	$F8	; HBIOS: SYSGET function
 bf_sysset	.equ	$F9	; HBIOS: SYSGET function
 bf_sysgettimer	.equ	$D0	; TIMER subfunction
 bf_syssettimer	.equ	$D0	; TIMER subfunction
 bf_sysgetsecs	.equ	$D1	; SECONDS subfunction
 bf_syssetsecs	.equ	$D1	; SECONDS subfunction
 ;
 ;===============================================================================
 ; Code Section
@ -106,6 +109,15 @@ process00:
 	jr	process00	; continue looking for options
 ;
 process0:
 ;
 	; Test of API function to set seconds value
 	;ld	b,bf_sysset	; HBIOS SYSGET function
 	;ld	c,bf_syssetsecs	; SECONDS subfunction
 	;ld	de,0		; set seconds value
 	;ld	hl,1000		; ... to 1000
 	;rst	08		; call HBIOS, DE:HL := seconds value
 ;
 	; get and print seconds value
 	call	crlf2		; formatting
 ;
 process1:
--- a/Source/BPBIOS/diskdefs
+++ b/Source/BPBIOS/diskdefs
@ -297,121 +297,158 @@ diskdef wbw_rom1024
  os 2.2
 end
 # UNA 512KB ROM (128KB reserved, 384KB ROM Disk)
 # RomWBW 720K floppy media
 diskdef wbw_fd720
  seclen 512
  tracks 160
  sectrk 9
  blocksize 2048
  maxdir 128
  skew 0
  boottrk 4
  os 2.2
 end
 diskdef una_rom512
 # RomWBW 1.44M floppy media
 diskdef wbw_fd144
  seclen 512
  tracks 12
  sectrk 64
  tracks 160
  sectrk 18
  blocksize 2048
  maxdir 256
  skew 0
  boottrk 0
  boottrk 2
  os 2.2
 end
 # UNA 512KB ROM (128KB reserved, 896KB ROM Disk)
 # RomWBW 360K floppy media
 diskdef wbw_fd360
  seclen 512
  tracks 80
  sectrk 9
  blocksize 2048
  maxdir 128
  skew 0
  boottrk 4
  os 2.2
 end
 diskdef una_rom1024
 # RomWBW 1.20M floppy media
 diskdef wbw_fd120
  seclen 512
  tracks 28
  sectrk 64
  tracks 160
  sectrk 15
  blocksize 2048
  maxdir 256
  skew 0
  boottrk 0
  boottrk 2
  os 2.2
 end
 # RomWBW 8MB Hard Disk, LU 0-3
 # RomWBW 8MB Hard Disk, first 4 slices
 # Legacy format, 512 dir entries, 8,320 sectors / slice
 diskdef wbw_hd0
  seclen 512
  tracks 65
  sectrk 256
  tracks 1040
  sectrk 16
  blocksize 4096
  maxdir 512
  skew 0
  boottrk 1
  boottrk 16
  os 2.2
 end
 diskdef wbw_hd1
  seclen 512
  tracks 130
  sectrk 256
  tracks 2080
  sectrk 16
  blocksize 4096
  maxdir 512
  skew 0
  boottrk 66
  boottrk 1056
  os 2.2
 end
 diskdef wbw_hd2
  seclen 512
  tracks 195
  sectrk 256
  tracks 3120
  sectrk 16
  blocksize 4096
  maxdir 512
  skew 0
  boottrk 131
  boottrk 2096
  os 2.2
 end
 diskdef wbw_hd3
  seclen 512
  tracks 260
  sectrk 256
  tracks 4160
  sectrk 16
  blocksize 4096
  maxdir 512
  skew 0
  boottrk 196
  boottrk 3136
  os 2.2
 end
 # RomWBW 720K floppy media
 diskdef wbw_fd720
 # RomWBW 8MB Hard Disk
 # New format, 1024 dir entries, 8,192 sectors / slice
 # Pure filesystem image, no prefix
 diskdef wbw_hd_new
  seclen 512
  tracks 160
  sectrk 9
  blocksize 2048
  maxdir 128
  tracks 1024
  sectrk 16
  blocksize 4096
  maxdir 1024
  skew 0
  boottrk 4
  boottrk 2
  os 2.2
 end
 # RomWBW 1.44M floppy media
 diskdef wbw_fd144
 # RomWBW 8MB Hard Disk, first 4 slices
 # New format, 1024 dir entries, 8,192 sectors / slice
 # Assumes 256 sector (16 track) hard disk prefix
 diskdef wbw_hd0_new
  seclen 512
  tracks 160
  sectrk 18
  blocksize 2048
  maxdir 256
  tracks 1040
  sectrk 16
  blocksize 4096
  maxdir 1024
  skew 0
  boottrk 2
  boottrk 18
  os 2.2
 end
 # RomWBW 360K floppy media
 diskdef wbw_fd360
 diskdef wbw_hd1_new
  seclen 512
  tracks 80
  sectrk 9
  blocksize 2048
  maxdir 128
  tracks 2064
  sectrk 16
  blocksize 4096
  maxdir 1024
  skew 0
  boottrk 4
  boottrk 1042
  os 2.2
 end
 # RomWBW 1.20M floppy media
 diskdef wbw_fd120
 diskdef wbw_hd2_new
  seclen 512
  tracks 160
  sectrk 15
  blocksize 2048
  maxdir 256
  tracks 3112
  sectrk 16
  blocksize 4096
  maxdir 1024
  skew 0
  boottrk 2
  boottrk 2066
  os 2.2
 end
 diskdef wbw_hd3_new
  seclen 512
  tracks 4136
  sectrk 16
  blocksize 4096
  maxdir 1024
  skew 0
  boottrk 3114
  os 2.2
 end
--- a/Source/CBIOS/cbios.asm
+++ b/Source/CBIOS/cbios.asm
@ -252,9 +252,9 @@ DEVMAP:
 ;			    |			 |			    |
 ;      +--------------------+			 +-> [DPH]		    +-> [DPH]
 ;      |
 ;      V-----+-------+-------+-------+--------+-----+-----+-----+
 ; DPH: | XLT | 0000H | 0000H | 0000H | DIRBUF | DPB | CSV | ALV |
 ;      +---16+-----16+-----16+-----16+------16+-+-16+-+-16+-+-16+
 ;      V-----+-------+-------+-------+--------+-----+-----+-----+--------+
 ; DPH: | XLT | 0000H | 0000H | 0000H | DIRBUF | DPB | CSV | ALV | LBAOFF |
 ;      +---16+-----16+-----16+-----16+------16+-+-16+-+-16+-+-16+------32+
 ;		   (ONE DPH PER DRIVE)		|     |	    |
 ;						|     |	    +----------+
 ;						|     |		       |
@ -289,6 +289,7 @@ DPBMAP:
 	.DW	DPB_FD360	; MID_FD360
 	.DW	DPB_FD120	; MID_FD120
 	.DW	DPB_FD111	; MID_FD111
 	.DW	DPB_HDNEW	; MID_HDNEW (1024 DIR ENTRIES)
 ;
 DPBCNT	.EQU	($ - DPBMAP) / 2
 ;
@ -1199,6 +1200,7 @@ DSK_GETINF1:	; ERROR RETURN
 DSK_SELECT:
 	LD	B,E		; SAVE E IN B FOR NOW
 	CALL	DSK_GETINF	; GET D=UNIT, E=SLICE, HL=DPH ADDRESS
 	CALL	NZ,PANIC	; *DEBUG*
 	RET	NZ		; RETURN IF INVALID DRIVE (A=1, NZ SET, HL=0)
 	PUSH	BC		; WE NEED  B LATER, SAVE ON STACK
 ;
@ -1209,13 +1211,15 @@ DSK_SELECT:
 	LD	(SEKUNIT),A	; SAVE UNIT
 	LD	(SEKDPH),HL	; SAVE DPH ADDRESS
 ;
 	; UPDATE OFFSET FOR ACTIVE SLICE
 	; A TRACK IS ASSUMED TO BE 16 SECTORS
 	; THE OFFSET REPRESENTS THE NUMBER OF BLOCKS * 256
 	;   TO USE AS THE OFFSET
 	LD	H,65		; H = TRACKS PER SLICE, E = SLICE NO
 	CALL	MULT8		; HL := H * E (TOTAL TRACK OFFSET)
 	LD	(SEKOFF),HL	; SAVE NEW TRACK OFFSET
 	LD	A,E		; A := SLICE
 	LD	(SLICE),A	; SAVE IT
 	; UPDATE LBAOFF FROM DPH
 	LD	HL,(SEKDPH)
 	LD	A,16
 	CALL	ADDHLA
 	LD	DE,SEKLBA
 	LD	BC,4
 	LDIR
 ;
 	; RESTORE DE TO BC (FOR ACCESS TO DRIVE LOGIN BIT)
 	POP	BC		; GET ORIGINAL E INTO B
@ -1234,11 +1238,24 @@ DSK_SELECT:
 	LD	E,1		; ENABLE MEDIA CHECK/DISCOVERY
 	RST	08		; DO IT
 	LD	A,E		; RESULTANT MEDIA ID TO ACCUM
 	LD	(MEDID),A	; SAVE IT
 	OR	A		; SET FLAGS
 	LD	HL,0		; ASSUME FAILURE
 	RET	Z		; BAIL OUT IF NO MEDIA
 ;
 	; A HAS MEDIA ID, SET HL TO CORRESPONDING DPBMAP ENTRY
 	; CLEAR LBA OFFSET (DWORD)
 	LD	HL,0		; ZERO
 	LD	(SEKLBA),HL	; CLEAR FIRST WORD
 	LD	(SEKLBA+2),HL	; CLEAR SECOND WORD
 ;
 	; CHECK MBR OF PHYSICAL DISK BEING SELECTED
 	; WILL UPDATE MEDID AND LBAOFF IF VALID CP/M PARTITION EXISTS
 	CALL	DSK_MBR		; UPDATE MEDIA FROM MBR
 	LD	HL,0		; ASSUME FAILURE
 	RET	NZ		; ABORT ON I/O ERROR
 ;
 	; SET HL TO DPBMAP ENTRY CORRESPONDING TO MEDIA ID
 	LD	A,(MEDID)	; GET MEDIA ID
 	LD	HL,DPBMAP	; HL = DPBMAP
 	RLCA			; DPBMAP ENTRIES ARE 2 BYTES EACH
 	CALL	ADDHLA		; ADD OFFSET TO HL
@ -1249,12 +1266,22 @@ DSK_SELECT:
 	LD	D,(HL)		; DE = ADDRESS OF DESIRED DPB
 ;
 	; PLUG DPB INTO THE ACTIVE DPH
 	LD	HL,(SEKDPH)
 	LD	HL,(SEKDPH)	; POINT TO START OF DPH
 	LD	BC,10		; OFFSET OF DPB IN DPH
 	ADD	HL,BC		; HL := DPH.DPB
 	LD	(HL),E		; SET LSB OF DPB IN DPH
 	INC	HL		; BUMP TO MSB
 	LD	(HL),D		; SET MSB OF DPB IN DPH
 ;
 ;	; PLUG LBA OFFSET INTO ACTIVE DPH
 	LD	HL,(SEKDPH)	; POINT TO START OF DPH
 	LD	BC,16		; OFFSET OF LBA OFFSET IN DPH
 	ADD	HL,BC		; HL := DPH.LBAOFF PTR
 	EX	DE,HL		; DEST IS DPH.LBAOFF PTR
 	LD	HL,SEKLBA	; SOURCE IS LBAOFF
 	LD	BC,4		; 4 BYTES
 	LDIR			; DO IT
 ;
 #ENDIF
 ;
 DSK_SELECT2:
@ -1262,6 +1289,131 @@ DSK_SELECT2:
 	XOR	A		; FLAG SUCCESS
 	RET			; NORMAL RETURN
 ;
 ; CHECK MBR OF DISK TO SEE IF IT HAS A PARTITION TABLE.
 ; IF SO, LOOK FOR A CP/M PARTITION.  IF FOUND, GET
 ; UPDATE THE PARTITION OFFSET (LBAOFF) AND UPDATE
 ; THE MEDIA ID (MEDID).
 ;
 #IFDEF PLTWBW
 ;
 DSK_MBR:
 	; CHECK MEDIA TYPE, ONLY HARD DISK IS APPLICABLE
 	LD	A,(MEDID)	; GET MEDIA ID
 	CP	MID_HD		; HARD DISK?
 	JR	Z,DSK_MBR1	; IF SO, CONTINUE
 	XOR	A		; ELSE, N/A, SIGNAL SUCCESS
 	RET			; AND RETURN
 ;
 DSK_MBR1:
 	; FLUSH DSKBUF TO MAKE SURE IT IS SAFE TO USE IT.
 	CALL	BLKFLSH		; MAKE SURE DISK BUFFER IS NOT DIRTY
 	XOR	A		; CLEAR ACCUM
 	LD	(HSTACT),A	; CLEAR HOST BUFFER ACTIVE FLAG
 ;
 	; READ SECTOR ZERO (MBR)
 	LD	B,BF_DIOREAD	; READ FUNCTION
 	LD	A,(SEKUNIT)	; GET UNIT
 	LD	C,A		; PUT IN C
 	LD	DE,0		; LBA SECTOR ZERO
 	LD	HL,0		; ...
 	CALL	DSK_IO2		; DO IT
 	RET	NZ		; ABORT ON ERROR
 ;
 	; SWITCH TO BIOS BANK TO ACCESS DISK BUFFER
 	LD	A,(HB_CURBNK)	; GET CUR BANK
 	PUSH	AF		; SAVE CUR BANK
 	LD	A,(BNKBIOS)	; BIOS BANK
 	CALL	HB_BNKSEL	; DO IT
 ;
 	; CHECK SIGNATURE
 	LD	HL,(DSKBUF)	; DSKBUF ADR
 	LD	DE,$1FE		; OFFSET TO SIGNATURE
 	ADD	HL,DE		; POINT TO SIGNATURE
 	LD	A,(HL)		; GET FIRST BYTE
 	CP	$55		; CHECK FIRST BYTE
 	JR	NZ,DSK_MBR4	; NO MATCH, NO PART TABLE
 	INC	HL		; NEXT BYTE
 	LD	A,(HL)		; GET SECOND BYTE
 	CP	$AA		; CHECK SECOND BYTE
 	JR	NZ,DSK_MBR4	; NO MATCH, NO PART TABLE, ABORT
 ;
 	; TRY TO FIND OUR ENTRY IN PART TABLE AND CAPTURE LBA OFFSET
 	LD	B,4		; FOUR ENTRIES IN PART TABLE
 	LD	HL,(DSKBUF)	; DSKBUF ADR
 	LD	DE,$1BE+4	; OFFSET OF FIRST ENTRY PART TYPE
 	ADD	HL,DE		; POINT TO IT
 DSK_MBR2:
 	LD	A,(HL)		; GET PART TYPE
 	CP	$52		; CP/M PARTITION?
 	JR	Z,DSK_MBR3	; COOL, GRAB THE LBA OFFSET
 	LD	DE,16		; PART TABLE ENTRY SIZE
 	ADD	HL,DE		; BUMP TO NEXT ENTRY PART TYPE
 	DJNZ	DSK_MBR2	; LOOP THRU TABLE
 	JR	DSK_MBR4	; TOO BAD, NO CP/M PARTITION
 ;
 DSK_MBR3:
 	; WE HAVE LOCATED A VALID CP/M PARTITION
 	; HL POINTS TO PART TYPE FIELD OF PART ENTRY
 	; UPDATE MEDIA ID
 	LD	A,MID_HDNEW	; NEW MEDIA ID
 	LD	(MEDID),A	; SAVE IT
 ;
 	; CAPTURE THE LBA OFFSET
 	LD	DE,4		; LBA IS 4 BYTES AFTER PART TYPE
 	ADD	HL,DE		; POINT TO IT
 	LD	DE,SEKLBA	; LOC TO STORE LBA OFFSET
 	LD	BC,4		; 4 BYTES (32 BITS)
 	LDIR			; COPY IT
 ;
 DSK_MBR4:
 	; RESTORE BANK
 	POP	AF		; GET PREV BANK
 	CALL	HB_BNKSEL	; SELECT IT
 ;
 DSK_MBR5:
 ;
 	; DIFFERENT ALGORITHM FOR NEW HD FORMAT
 	LD	A,(MEDID)	; GET MEDIA ID
 	CP	MID_HDNEW	; NEW FORMAT?
 	JR	Z,DSK_MBR6	; IF SO, GO THERE
 ;
 	; OLD HD FORMAT, 65 TRACKS PER SLICE
 	LD	A,(SLICE)	; GET SLICE
 	LD	E,A		; E = SLICE NO
 	LD	H,65		; H = TRACKS PER SLICE
 	CALL	MULT8		; HL := H * E (TOTAL TRACK OFFSET)
 	LD	DE,0		; CLEAR HI WORD
 	LD	B,8		; 16 SPT, SHIFT 4 BITS
 	CALL	RL32		; DO IT
 	JR	DSK_MBR7	; DONE
 ;
 DSK_MBR6:
 	; NEW HD FORMAT, MULTIPLY SLICE BY 8MB
 	LD	DE,0		; CLEAR HIWORD
 	LD	H,0		; CLEAR HI BYTE OR LOWORD
 	LD	A,(SLICE)	; GET SLICE
 	LD	L,A		; PUT SLICE IN LOW BYTE
 	LD	B,14
 	CALL	RL32		; MULTIPLY BY 16384 SECTORS (8MB)
 ;
 DSK_MBR7:
 	; ADD IN LBA OFFSET
 	LD	BC,(SEKLBA)	; LBA OFFSET LOWORD
 	ADD	HL,BC
 	EX	DE,HL
 	LD	BC,(SEKLBA+2)	; LBA OFFSET HIWORD
 	ADC	HL,BC
 	EX	DE,HL
 	SET	7,D		; SET LBA ACCESS BIT
 	; RESAVE IT
 	LD	(SEKLBA),HL	; LOWORD
 	LD	(SEKLBA+2),DE	; HIWORD
 	; SUCCESSFUL FINISH
 	XOR	A		; SUCCESS
 	RET			; DONE
 ;
 #ENDIF
 ;
 ;
 ;
 DSK_STATUS:
@ -1297,7 +1449,7 @@ DSK_WRITE:
 ;
 ;
 #IFDEF PLTUNA
 ;
 DSK_IO:
 	PUSH	BC
 	LD	DE,(HSTTRK)	; GET TRACK INTO HL
@ -1338,15 +1490,10 @@ DSK_IO1:
 	RST	08
 	OR	A		; SET FLAGS BASED ON RESULT
 	RET
 #ELSE
 DSK_IO:
 ;
 ; TRANSLATE CP/M TRACK/SECTOR -> HBIOS TRACK/HEAD/SECTOR
 ; NEEDS TO HANDLE FLOPPY SEPARATE FROM HARD DISK
 #ELSE
 ;
 CHS:
 DSK_IO:
 	LD	A,(HSTUNIT)		; GET UNIT
 	LD	C,A			; UNIT -> C
 	PUSH	BC			; SAVE FUNC/UNIT
@ -1356,7 +1503,7 @@ CHS:
 	LD	A,D			; DEVICE TYPE -> A
 	AND	$F0			; ISOLATE HIGH BITS
 	CP	DIODEV_FD		; FLOPPY?
 	JR	NZ,CHSHD		; IF NOT, DO HD CHS XLAT
 	JR	NZ,LBA_IO		; IF NOT, DO LBA IO
 ;
 ; FLOPPY SPECIFIC TRANSLATION ASSUMES FLOPPY IS DOUBLE-SIDED AND
 ; USES LOW ORDER BIT OF TRACK AS HEAD VALUE
@ -1368,40 +1515,37 @@ CHS:
 	SRL	H			; SHIFT HEAD BIT OUT OF HL
 	RR	L			; ... AND INTO CARRY
 	RL	D			; CARRY BIT (HEAD) INTO D
 	JR	CHS2
 ;
 ; HARD DISK SPECIFIC TRANSLATION
 ; ASSUMES 16 HEADS PER CYLINDER AND 16 SECTORS PER TRACK
 	JR	DSK_IO2			; DO THE DISK I/O
 ;
 CHSHD:
 	LD	HL,(HSTTRK)		; GET TRACK VALUE
 	LD	A,L			; LSB OF TRACK TO A
 	AND	$0F			; ISOLATE HEAD IN LOW 4 BITS
 	LD	D,A			; STUFF IT IN D
 LBA_IO:
 	LD	A,(HSTUNIT)		; GET THE UNIT VALUE
 	LD	C,A			; PUT IT IN C
 	PUSH	BC			; SAVE FUNC/UNIT
 	; GET TRACK AND SHIFT TO MAKE ROOM FOR 4 BIT SECTOR VALUE
 	LD	HL,(HSTTRK)		; GET TRACK
 	LD	DE,0			; CLEAR HIWORD
 	LD	B,4			; X16 (16 SPT ASSUMED)
 	CALL	RL32			; DO IT
 	; COMBINE WITH SECTOR
 	LD	A,(HSTSEC)		; GET SECTOR
 	LD	E,A			; STUFF IT IN E
 	LD	A,B			; SAVE B (HBIOS FUNC)
 	LD	B,4			; PREPARE TO SHIFT OUT 4 BIT HEAD VALUE
 CHSHD1:
 	SRL	H			; SHIFT ONE BIT OUT
 	RR	L			; ... OF HL
 	DJNZ	CHSHD1			; DO ALL 4 BITS
 	LD	B,A			; RESTORE B (HBIOS FUNC)
 	; FALL THRU TO CHS2
 ;
 ; ALL TYPES OF TRANSLATION WIND UP HERE TO
 ; MAKE THE ACTUAL HBIOS CALL
 ;
 CHS2:
 	PUSH	DE			; SAVE HEAD/SECTOR	+ COULD MOVE
 	LD	DE,(HSTOFF)		; NOW GET SLICE OFFSET	| TO CHSHD,
 	ADD	HL,DE			; ADD IT TO TRACK VALUE	| NO SLICES
 	POP	DE			; RECOVER HEAD/SECTOR	+ FOR FLOPPY
 	OR	L
 	LD	L,A
 	; ADD IN LBA OFFSET FOR PARTITION AND/OR SLICE
 	LD	BC,(HSTLBA)		; LBA OFFSET LOWORD
 	ADD	HL,BC	
 	EX	DE,HL	
 	LD	BC,(HSTLBA+2)		; LBA OFFSET HIWORD
 	ADC	HL,BC
 	EX	DE,HL
 	SET	7,D			; MAKE SURE LBA ACCESS BIT SET
 	POP	BC			; RESTORE FUNC/UNIT
 	;JR	DSK_IO2			; DO THE DISK I/O (FALL THRU)
 ;
 ; MAKE HBIOS CALL
 ; HBIOS FUNC SHOULD STILL BE IN B
 ; UNIT SHOULD STILL BE IN C
 ;
 DSK_IO2:
 	PUSH	BC			; SAVE INCOMING FUNCTION, DEVICE/UNIT
 	LD	B,BF_DIOSEEK		; SETUP FOR NEW SEEK CALL
 	RST	08			; DO IT
@ -1411,10 +1555,11 @@ CHS2:
 	LD	A,(BNKBIOS)		; GET BIOS BANK
 	LD	D,A			; TRANSFER TO/FROM BIOS BANK
 	LD	E,1			; TRANSFER ONE SECTOR
 	;CALL	PC_ASTERISK		; *DEBUG*
 	RST	08			; DO IT
 	OR	A			; SET FLAGS
 	RET				; DONE
 ;
 #ENDIF
 ;
 ;==================================================================================================
@ -1504,9 +1649,11 @@ STR_SEC		.DB	" SEC=$"
 ;STR_READONLY	.DB	"\r\nCBIOS Err: Read Only Drive$"
 ;STR_STALE	.DB	"\r\nCBIOS Err: Stale Drive$"
 ;
 SECADR		.DW 	0		; ADDRESS OF SECTOR IN ROM/RAM PAGE
 ;SECADR		.DW	0		; ADDRESS OF SECTOR IN ROM/RAM PAGE
 DEFDRIVE	.DB	0		; DEFAULT DRIVE
 CCPBUF		.DW	0		; ADDRESS OF CCP BUF IN BIOS BANK
 MEDID		.DB	0		; TEMP STORAGE FOR MEDIA ID
 SLICE		.DB	0		; CURRENT SLICE
 ;
 #IFDEF PLTWBW
 BNKBIOS		.DB	0		; BIOS BANK ID
@ -1536,6 +1683,7 @@ SEKUNIT		.DB 	0		; DISK UNIT
 SEKDPH		.DW	0		; ADDRESS OF ACTIVE (SELECTED) DPH
 SEKOFF		.DW	0		; TRACK OFFSET IN EFFECT FOR SLICE
 SEKACT		.DB	TRUE		; ALWAYS TRUE!
 SEKLBA		.FILL	4,0		; LBA OFFSET
 ;
 ; RESULT OF CPM TO PHYSICAL TRANSLATION
 ;
@ -1547,6 +1695,7 @@ XLTUNIT		.DB	0
 XLTDPH		.DW	0
 XLTOFF		.DW	0
 XLTACT		.DB	TRUE		; ALWAYS TRUE!
 XLTLBA		.FILL	4,0		; LBA OFFSET
 ;
 XLTSIZ		.EQU	$ - XLT
 ;
@ -1560,6 +1709,7 @@ HSTUNIT		.DB	0		; DISK UNIT IN BUFFER
 HSTDPH		.DW	0		; CURRENT DPH ADDRESS
 HSTOFF		.DW	0		; TRACK OFFSET IN EFFECT FOR SLICE
 HSTACT		.DB	0		; TRUE = BUFFER HAS VALID DATA
 HSTLBA		.FILL	4,0		; LBA OFFSET
 ;
 ; SEQUENTIAL WRITE TRACKING FOR (UNA)LLOCATED BLOCK
 ;
@ -1695,11 +1845,28 @@ DPB_HD:
 	.DB	31		; BLM: BLOCK MASK
 	.DB	1		; EXM: EXTENT MASK
 	.DW	2047		; DSM: TOTAL STORAGE IN BLOCKS - 1 = (8MB / 4K BLS) - 1 = 2047
 	.DW  	511		; DRM: DIR ENTRIES - 1 = 512 - 1 = 511
 	.DW	512 - 1		; DRM: DIR ENTRIES - 1
 	.DB	11110000B	; AL0: DIR BLK BIT MAP, FIRST BYTE
 	.DB	00000000B	; AL1: DIR BLK BIT MAP, SECOND BYTE
 	.DW	0		; CKS: DIRECTORY CHECK VECTOR SIZE = 256 / 4
 	.DW  	16		; OFF: RESERVED TRACKS = 16 TRKS * (16 TRKS * 16 HEADS * 16 SECS * 512 BYTES) = 128K
 	.DW	16		; OFF: RESERVED TRACKS
 ;
 ;   BLOCKSIZE (BLS) = 4K, DIRECTORY ENTRIES = 1024
 ;
 	.DW	CKS_HD
 	.DW	ALS_HD
 	.DB	(4096 / 128)	; RECORDS PER BLOCK (BLS / 128)
 DPB_HDNEW:
 	.DW	64		; SPT: SECTORS PER TRACK
 	.DB	5		; BSH: BLOCK SHIFT FACTOR
 	.DB	31		; BLM: BLOCK MASK
 	.DB	1		; EXM: EXTENT MASK
 	.DW	2048 - 1 - 4	; DSM: STORAGE BLOCKS - 1 - RES TRKS
 	.DW	1024 - 1	; DRM: DIR ENTRIES - 1
 	.DB	11111111B	; AL0: DIR BLK BIT MAP, FIRST BYTE
 	.DB	00000000B	; AL1: DIR BLK BIT MAP, SECOND BYTE
 	.DW	0		; CKS: DIRECTORY CHECK VECTOR SIZE = 256 / 4
 	.DW	2		; OFF: RESERVED TRACKS
 ;__________________________________________________________________________________________________
 ;
 ; IBM 720KB 3.5" FLOPPY DRIVE, 80 TRKS, 36 SECS/TRK, 512 BYTES/SEC
@ -2650,7 +2817,8 @@ DPH_INIT:
 	LD	H,0		; ... INTO HL
 	ADD	HL,HL		; MULTIPLY
 	ADD	HL,HL		; ... BY SIZE
 	ADD	HL,HL		; ... OF DPH (16)
 	CALL	ADDHLA		; ...
 	ADD	HL,HL		; ... OF DPH (20)
 	ADD	HL,HL		; ... FOR TOTAL SIZE
 	CALL	ALLOC		; ALLOCATE THE SPACE
 	CALL	C,PANIC		; SHOULD NEVER ERROR
@ -2707,7 +2875,8 @@ DPH_INIT2:
 	LD	(HL),D		; ... DRIVE MAP
 	INC	HL		; AND BUMP TO START OF NEXT ENTRY
 	; UPDATE DPH ALLOCATION TOP
 	LD	A,16		; SIZE OF A DPH ENTRY
 	;LD	A,16		; SIZE OF A DPH ENTRY
 	LD	A,20		; SIZE OF A DPH ENTRY
 	EX	DE,HL		; HL := DPH POINTER
 	CALL	ADDHLA		; CALC NEW DPHTOP
 	LD	(DPHTOP),HL	; SAVE IT
--- a/Source/CBIOS/util.asm
+++ b/Source/CBIOS/util.asm
@ -430,3 +430,15 @@ PRTHEXBUF1:
 	INC	DE
 	DJNZ	PRTHEXBUF1
 	RET
 ;
 ; LEFT SHIFT DE:HL BY B BITS (B > 0)
 ;
 RL32:
 	OR	A			; CLEAR CARRY
 	RL	L
 	RL	H
 	RL	E
 	RL	D
 	DJNZ	RL32
 	RET
--- a/Source/CPM3/biosldr.z80
+++ b/Source/CPM3/biosldr.z80
@ -51,57 +51,67 @@
 	jp	0	; reserved for future expansion
 	jp	0	; reserved for future expansion
 boot:
 	  if cmdline
 mbrsec	equ	dtabuf
 boot:
 	; The main module (cpmldr.asm) does not expect the
 	; boot call to use much stack.	We use our own during
 	; this routine to avoid issues.
 	ld	(stksav),sp
 	ld	sp,stack
 boot1:
 	ld	de,msgunit
 	call	writestr
 	call	cin
 	push	af
 	call	cout
 	pop	af
 	; Do the real work
 	call	boot0
 	; Restore original stack and return
 	ld	sp,(stksav)
 	ret
 	sub	'0'
 	ld	(unit),a
 	jr	c,selerr
 boot0:
 	  if cmdline
 boot1:
 	; Get disk unit from user
 	ld	de,msgunit		; disk unit prompt
 	call	writestr		; display on console
 	call	cin			; get a character
 	push	af			; save it
 	call	cout			; echo character
 	pop	af			; restore it
 	sub	'0'			; convert to binary
 	ld	(unit),a		; save it
 	jr	c,selerr		; loop if below 0 entered
 	ld	bc,0F810h		; HBIOS, get disk unit count
 	call	0FFF0h			; do it, E := disk unit count
 	ld	a,(unit)		; get unit num back
 	cp	e			; compare to entry
 	jr	nc,selerr		; loop if too high
 	ld	de,msgslc
 	call	writestr
 	call	cin
 	push	af
 	call	cout
 	pop	af
 	sub	'0'
 	ld	(slice),a
 	jr	c,selerr
 	cp	10
 	jr	nc,selerr
 	jr	boot2
 	; Get disk slice from user
 	ld	de,msgslc		; slice prompt
 	call	writestr		; display on console
 	call	cin			; get a character
 	push	af			; save it
 	call	cout			; echo it
 	pop	af			; restore it
 	sub	'0'			; convert to binary
 	ld	(slice),a		; save it
 	jr	c,selerr		; loop if below 0 entered
 	cp	10			; check for over 9
 	jr	nc,selerr		; loop if over 9
 	ld	de,crlf			; linefeed
 	call	writestr		; ... to console
 	jr	boot2			; boot w/ unit & slice
 selerr:
 	ld	de,msginv
 	call	writestr
 	jr	boot1
 	; Display invalid entry message and restart
 	ld	de,msginv		; error message
 	call	writestr		; display on console
 	jr	boot1			; loop
 boot2:
 	ld	de,crlf
 	call	writestr
 	ld	sp,(stksav)
 	; Record unit & slice w/ HBIOS
 	ld	bc,0F9E0h		; HBIOS func: set boot info
 	ld	a,(unit)		; get unit
 	ld	d,a			; put in D
@ -112,6 +122,7 @@ boot2:
 	  else
 	; Get unit & slice from HBIOS
 	ld	bc,0F8E0h		; HBIOS func: get boot info
 	call	0FFF0h			; do it, D := boot unit, E: := slice
 	ld	a,d			; move unit to A
@ -121,27 +132,118 @@ boot2:
 	  endif
 	; Check that drive actually exists
 	ld	bc,0F810h		; HBIOS func: get disk count
 	call	0FFF0h			; do it, E=disk count
 	ld	a,(unit)		; get boot disk unit
 	cp	e			; compare to count
 	jp	nc,err_nodisk		; handle no disk err
 	; Sense media to determine media format
 	ld	a,(unit)		; Get boot unit
 	ld	c,a			; put in C
 	ld	b,18h			; HBIOS Media function
 	ld	e,1			; Enable media check/discovery
 	call	0FFF0H			; HBIOS call
 	ld	a,e		; Resultant media id to accum
 	or	a		; Set flags
 	;halt
 	;
 	; !!! Need to do something on error !!!
 	;
 	ret	z		; Bail out on error
 	jp	nz,err_diskio		; handle error
 	ld	a,e			; resultant media id to accum
 	ld	(medid),a		; save media id
 	or	a			; set flags, 0 is no media
 	jp	z,err_diskio		; handle no media error
 	; Initialize slice start LBA & sectors per slice
 	ld	hl,0			; assume slice starts
 	ld	(lba),hl		; ... at LBA offset
 	ld	(lba+2),hl		; ... of zero
 	ld	hl,16640		; assume legacy value for
 	ld	(sps),hl		; ... sectors per slice
 	; If not hard disk, skip partition & slice stuff
 	ld	a,(medid)		; get media id
 	cp	4			; hard disk?
 	jr	nz,boot9		; if not, jump ahead
 	; Read MBR
 	ld	de,8000h		; LBA address zero
 	ld	hl,0			; ... to read first sector
 	ld	bc,mbrsec		; read into MBR buffer
 	ld	(dma),bc		; save
 	ld	b,1			; one sector
 	ld	a,(unit)		; get bootunit
 	ld	c,a			; put in C
 	call	diskread		; do it, no return on err
 	; Check signature
 	ld	hl,(mbrsec+1FEh)	; get signature
 	ld	a,l			; first byte
 	cp	055h			; should be $55
 	jr	nz,boot5		; if not, no part table
 	ld	a,h			; second byte
 	cp	0AAh			; should be $AA
 	jr	nz,boot5		; if not, no part table
 	; Search part table for CP/M entry (type 0x52)
 	ld	b,4			; four entries in part table
 	ld	hl,mbrsec+1BEh+4	; offset of first part type
 boot3:
 	ld	a,(hl)			; get part type
 	cp	52h			; CP/M partition?
 	jr	z,boot4			; cool, grab the LBA offset
 	ld	de,16			; part table entry size
 	add	hl,de			; bump to next part type
 	djnz	boot3			; loop thru table
 	jr	boot5			; too bad, no CP/M partition
 boot4:
 	; Capture the starting LBA of the CP/M partition we found
 	ld	de,4			; LBA is 4 bytes after part type
 	add	hl,de			; point to it
 	ld	de,lba			; loc to store lba offset
 	ld	bc,4			; 4 bytes (32 bits)
 	ldir				; copy it
 	; For now, it is implied that a slice within a partition
 	; table will be in the "new" disk format.  So, we now
 	; adjust the sectors per slice and media id.
 	; Use new slice format sectors per slice value
 	ld	hl,16384		; new sectors per slice
 	ld	(sps),hl		; save it
 	; Update media id for new hard disk format
 	ld	a,10			; new media id
 	ld	(medid),a		; save it
 boot5:
 	; Adjust LBA offset based on target slice
 	ld	a,(slice)		; get boot slice, A is loop cnt
 	ld	hl,(lba)		; set DE:HL
 	ld	de,(lba+2)		; ... to starting LBA
 	ld	bc,(sps)		; sectors per slice
 boot6:
 	or	a			; set flags to check loop cntr
 	jr	z,boot8			; done if counter exhausted
 	add	hl,bc			; add one slice to low word
 	jr	nc,boot7		; check for carry
 	inc	de			; if so, bump high word
 boot7:
 	dec	a			; dec loop downcounter
 	jr	boot6			; and loop
 boot8:
 	ld	(lba),hl		; save new lba, low word
 	ld	(lba+2),de		; save new lba, high word
 boot9:
 	; Locate DPB corresponding to media id
 	ld	hl,dpb$start - dpb$sz
 	ld	de,dpb$sz
 	ld	b,a		; loop count
 dsk$login1:
 	ld	a,(medid)		; get media id
 	ld	b,a			; to loop count
 boot10:
 	add	hl,de			; next dpb
 	djnz	dsk$login1	; loop as needed
 	djnz	boot10			; loop as needed
 	; hl is ptr to desired dpb
 	; Stuff DPB ptr (HL) into DPH
 	ld	de,dph0			; load DPH pointer
 	ex	de,hl			; de = DPB adr, hl = DPH adr
 	push	de			; save DPB adr
@ -149,10 +251,10 @@ dsk$login1:
 	add	hl,de			; hl = adr of DPB field in DPH
 	pop	de			; recover DPB adr
 	ld	(hl),e			; update LSB
 	inc	hl
 	ld	(hl),d		; udpate MSB
 	inc	hl			; point to MSB
 	ld	(hl),d			; update MSB
 	ret
 	ret				; done
 wboot:
 	ld	a,81H
@ -162,15 +264,14 @@ const:
 	ld	a,82H
 	halt
 conin:
 	ld	bc,0080H	; unit 80h (console), func 0 = CIN
 	call	0FFF0H
 	ld	bc,0080h		; unit 80h (console), func 0 = CIN
 	call	0FFF0h			; do it
 	ld	a,e			; put in C
 	ret				; done
 conout:
 	ld	e,c			; output character in E
 	ld	bc,0180H	; unit 80h (console), func 1 = COUT
 	;rst	08		; do it
 	call	0FFF0H
 	ret			; return
 	ld	bc,0180h		; unit 80h (console), func 1 = COUT
 	jp	0FFF0h	
 list:
 	ld	a,85H
 	halt
@ -197,61 +298,100 @@ setsec:
 setdma:
 	ld	(dma),bc
 	ret
 read:
 	; Check device type
 	ld	a,(unit)		; get unit
 	ld	c,a			; BIOS Disk Unit in C
 	ld	b,12H		; HBIOS SEEK function
 	push	bc		; save it
 	;push	de		; save XDPH pointer
 	ld	b,17h			; HBIOS DEVICE function
 	rst	08			; Do it, D=device type
 	ld	a,d			; put in accum
 	and	0F0h			; isolate high bits
 	ld	b,1		; assume it is floppy, 1 head bit
 	ld	c,01h		; 1 bit head mask
 	cp	10h			; floppy?
 	jr	z,seek0	; yup, skip ahead
 	ld	b,4		; must be hard disk, 4 head bits
 	ld	c,0Fh		; 4 bit head mask
 seek0:
 	;pop	de		; recover XDPH pointer
 	push	bc		; save bc
 	ld	a,(slice)	; get slice
 	ld	e,a		; slice to E
 	ld	h,65		; number of tracks per slice
 	call	mult8		; HL now has track offset for slice
 	pop	bc		; recover bc
 	push	hl		; save track offset for now
 	ld	hl,(trk)	; get track value
 	ld	a,l		; lsb of track to a
 	and	c		; apply mask
 	ld	d,a		; save in d
 seek1:                          
 	srl	h		; shift one bit out
 	rr	l		; ... of hl
 	djnz	seek1		; do all bits
 	jr	nz,read2		; if not, do LBA i/o
 	; Floppy I/O
 	ld	de,(sect)		; sector -> de, head(d) becomes zero
 	ld	hl,(trk)		; track -> hl (low bit has head)
 	srl	h			; shift head bit out of hl
 	rr	l			; ... and into carry
 	rl	d			; carry bit (head) into d
 	jr	read3			; do the disk i/o
 ;	; *** Simplify this to get rid of slice!!! ***
 ;	ld	b,1			; assume it is floppy, 1 head bit
 ;	ld	c,01h			; 1 bit head mask
 ;	push	bc			; save bc
 ;	ld	a,(slice)		; get slice
 ;	ld	e,a			; slice to E
 ;	ld	h,65			; number of tracks per slice
 ;	call	mult8			; HL now has track offset for slice
 ;	pop	bc			; recover bc
 ;	push	hl			; save track offset for now
 ;	ld	hl,(trk)		; get track value
 ;	ld	a,l			; lsb of track to a
 ;	and	c			; apply mask
 ;	ld	d,a			; save in d
 ;read1:	
 ;	srl	h			; shift one bit out
 ;	rr	l			; ... of hl
 ;	djnz	read1			; do all bits
 ;	ld	a,(sect)		; get sector
 ;	ld	e,a			; stuff it in e
 ;	ex	de,hl			; DE=track, HL=head/sect
 ;	ex	(sp),hl			; save head/sect, HL = offset
 ;	add	hl,de			; HL has final track value
 ;	pop	de			; recover head/sect to de
 ;	jr	read3
 	; LBA I/O
 read2:
 	ld	hl,(trk)		; get track
 	ld	de,0			; clear hiword
 	ld	b,4			; x16 (16 spt assumed)
 	call	rl32			; do it
 	; combine with sector
 	ld	a,(sect)		; get sector
 	ld	e,a		; stuff it in e
 	ex	de,hl		; de=track, hl=head/sect
 	ex	(sp),hl		; save head/sect, hl = offset
 	add	hl,de		; hl has final track value
 	pop	de		; recover head/sect to de
 	pop	bc		; recover function & unit
 	;rst	08		; perform seek
 	call	0FFF0H
 	; Read Sector
 	ld	b,13h		; HBIOS read
 	ld	a,(unit)	; get boot unit
 	or	l			; combine
 	ld	l,a			; and back to L
 	; add in lba offset
 	ld	bc,(lba)		; lba offset loword
 	add	hl,bc			; add to cur loword
 	ex	de,hl			; swap
 	ld	bc,(lba+2)		; lba offset hiword
 	adc	hl,bc			; add w/ carry to cur hiword
 	ex	de,hl			; swap back
 	set	7,d			; set lba access bit
 read3:
 	; DE:HL has sector address to read (LBA or CHS)
 	ld	a,(unit)		; get disk unit
 	ld	c,a			; put in C
 	ld	hl,(dma)	; dma address
 	ld	a,(0FFE0H)	; current bank
 	ld	d,a		; ... to D
 	ld	e,1		; 1 sector
 	;rst	08
 	call	0FFF0H
 	ld	b,1			; read 1 sector
 	jr	diskread		; read sector and return
 diskread:
 	; Read disk sector(s)
 	; DE:HL is LBA, B is sector count, C is disk unit
 	; Seek to requested sector in DE:HL
 	push	bc			; save unit & count
 	ld	b,012h			; HBIOS func: seek
 	call	0FFF0h			; do it
 	pop	bc			; recover unit & count
 	jp	nz,err_diskio		; handle error
 	; Read sector(s) into buffer
 	ld	e,b			; transfer count
 	ld	b,013h			; HBIOS func: disk read
 	ld	hl,(dma)		; read into info sec buffer
 	ld	a,(0FFE0h)		; get current bank
 	ld	d,a			; put in D
 	call	0FFF0h			; do it
 	jp	nz,err_diskio		; handle error
 	xor	a			; signal success
 	ret				; and done
 	ret
 write:
 	ld	a,8EH
 	halt
@ -291,10 +431,11 @@ flush:
 	halt
 move:
 	ex	de,hl	; we are passed source in DE and dest in HL
 	ldir		; use Z80 block move instruction
 	ex	de,hl	; need next addresses in same regs
 	ret
 	; On input, DE=src, HL=dest
 	ex	de,hl			; swap HL/DE for LDIR
 	ldir				; Z80 block move
 	ex	de,hl			; swap back (required!)
 	ret				; done
 time:
 	ld	a,9AH
 	halt
@ -309,20 +450,19 @@ xmove:
 	halt
 cin:
 	; input character from console via hbios
 	ld	c,080H			; console unit to c
 	ld	b,00H			; hbios func: input char
 	call	0FFF0H			; hbios reads character
 	ld	a,e			; move character to a for return
 	ret
 	; Input character from console via HBIOS
 	ld	c,080H			; console unit to C
 	ld	b,00H			; HBIOS func: input char
 	call	0FFF0H			; HBIOS reads character
 	ld	a,e			; To A for return
 	ret				; done
 cout:
 	; output character to console via hbios
 	ld	e,a			; output char to e
 	ld	c,080H			; console unit to c
 	ld	b,01H			; hbios func: output char
 	call	0FFF0H			; hbios outputs character
 	ret
 	; Output character to console via HBIOS
 	ld	e,a			; output char to E
 	ld	c,080H			; console unit to C
 	ld	b,01H			; HBIOS func: output char
 	jp	0FFF0H			; output & return
 writestr:
 	push	af
@ -339,12 +479,8 @@ writestr2:
 	pop	af
 	ret
 ;
 ; multiply 8-bit values
 ; in:  multiply h by e
 ; out: hl = result, e = 0, b = 0
 ;
 mult8:
 	; Multiply: H := H * E
 	ld	d,0
 	ld	l,d
 	ld	b,8
@ -356,6 +492,46 @@ mult8_noadd:
 	djnz	mult8_loop
 	ret
 rl32:
 	; Left shift DE:HL by B bits (B > 0)
 	or	a			; clear carry
 	rl	l			; rotate L thru carry
 	rl	h			; rotate H thru carry
 	rl	e			; rotate E thru carry
 	rl	d			; rotate D thru carry
 	djnz	rl32			; loop B times
 	ret				; done
 err_nodisk:
 	ld	hl,str_err_nodisk
 	jr	err
 err_noslice:
 	ld	hl,str_err_noslice
 	jr	err
 err_diskio:
 	ld	hl,str_err_diskio
 	jr	err
 err_sig:
 	ld	hl,str_err_sig
 	jr	err
 err_api:
 	ld	hl,str_err_api
 	jr	err
 err:
 	push	hl
 	ld	de,str_err_prefix
 	call	writestr
 	pop	de
 	call	writestr
 	halt
 str_err_prefix	db	"\r\n\r\n*** ","$"
 str_err_nodisk	db	"Disk unit not available","$"
 str_err_noslice	db	"Disk unit does not support slices","$"
 str_err_diskio	db	"Disk I/O failure","$"
 str_err_sig	db	"No system image on disk","$"
 str_err_api	db	"HBIOS API failure","$"
 msgunit	db	13,10,13,10,'Boot CP/M 3 from Disk Unit: $'
 msgslc	db	'   Slice: $'
 msginv	db	13,10,13,10,'*** Invalid Selection ***$'
@ -411,7 +587,7 @@ dpb$hd:		; 8MB Hard Disk Drive
 	db	31		; blm: block mask
 	db	1		; exm: extent mask
 	dw	2047		; dsm: total storage in blocks - 1 = (8mb / 4k bls) - 1 = 2047
 	dw  	511		; drm: dir entries - 1 = 512 - 1 = 511
 	dw	512-1		; drm: dir entries - 1 = 512 - 1 = 511
 	db	11110000b	; al0: dir blk bit map, first byte
 	db	00000000b	; al1: dir blk bit map, second byte
 	dw	8000h		; cks: directory check vector size - permanent storage = 8000H
@ -489,6 +665,20 @@ dpb_fd111:	; 8" DS/DD Floppy Drive (1.11M)
 	db	2		; psh: 2 for 512 byte sectors
 	db	3		; phm: (512 / 128) - 1
 dpb$hdnew:	; 8MB Hard Disk Drive (new format)
 	dw	64		; spt: sectors per track
 	db	5		; bsh: block shift factor
 	db	31		; blm: block mask
 	db	1		; exm: extent mask
 	dw	2048 - 1 - 4	; dsm: total storage in blocks - 1 = 2048 - 1 - resvd tracks
 	dw	1024 - 1	; drm: dir entries
 	db	11111111b	; al0: dir blk bit map, first byte
 	db	00000000b	; al1: dir blk bit map, second byte
 	dw	8000h		; cks: directory check vector size - permanent storage = 8000H
 	dw	2		; off: reserved tracks
 	db	2		; psh: 2 for 512 byte sectors
 	db	3		; phm: (512 / 128) - 1
 dph0:	dw	0		; xlt, 0 means no translation
 	db	0,0,0,0,0,0,0,0,0	; scratch (9 bytes)
 	db	0		; mf: media flag
@ -524,6 +714,10 @@ trk	ds	2	; current track
 sect	ds	2	; current sector
 dma	ds	2	; current DMA address
 medid	ds	1	; media id
 lba	ds	4	; current lba
 sps	ds	2	; sectors per slice
 csvbuf	ds	128	; length (CSV) = ((DRM+1)/4)
 alvbuf	ds	512	; length (ALV) = ((DSM+1)/4)
 dirbuf	ds	512	; sector buffer
@ -531,6 +725,6 @@ dtabuf	ds	512	; sector buffer
 	ds	64
 stack	equ	$
 stksav	dw	0
 stksav	ds	2
 	end
--- a/Source/CPM3/boot.z80
+++ b/Source/CPM3/boot.z80
@ -41,7 +41,7 @@ tpa$bank	equ 0
 	if banked
 	; Clone page zero from bank 0 to additional banks
 	ld	b,3			; last bank
 	ld	b,4			; last bank
 	ld	c,0			; src bank
 init$2:
 	push	bc			; save bank id's
--- a/Source/CPM3/diskio.z80
+++ b/Source/CPM3/diskio.z80
@ -37,7 +37,7 @@
 	extrn	?bnkxlt
 	;extrn	phex8, cout
 	extrn	phex8, cout
    ; CP/M 3 Disk definition macros
@ -62,6 +62,7 @@ bell	equ 7
 	dw	dsk$init
 	db	0,0		; HBIOS Disk Unit/Slice (filled in at boot)
 dph0:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	0, 0		; LBA Offset
 	dw	dsk$write
 	dw	dsk$read
@ -69,6 +70,7 @@ dph0:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	dsk$init
 	db	0,0		; HBIOS Disk Unit/Slice (filled in at boot)
 dph1:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	0, 0		; LBA Offset
 	dw	dsk$write
 	dw	dsk$read
@ -76,6 +78,7 @@ dph1:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	dsk$init
 	db	0,0		; HBIOS Disk Unit/Slice (filled in at boot)
 dph2:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	0, 0		; LBA Offset
 	dw	dsk$write
 	dw	dsk$read
@ -83,6 +86,7 @@ dph2:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	dsk$init
 	db	0,0		; HBIOS Disk Unit/Slice (filled in at boot)
 dph3:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	0, 0		; LBA Offset
 	dw	dsk$write
 	dw	dsk$read
@ -90,6 +94,7 @@ dph3:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	dsk$init
 	db	0,0		; HBIOS Disk Unit/Slice (filled in at boot)
 dph4:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	0, 0		; LBA Offset
 	dw	dsk$write
 	dw	dsk$read
@ -97,6 +102,7 @@ dph4:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	dsk$init
 	db	0,0		; HBIOS Disk Unit/Slice (filled in at boot)
 dph5:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	0, 0		; LBA Offset
 	dw	dsk$write
 	dw	dsk$read
@ -104,6 +110,7 @@ dph5:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	dsk$init
 	db	0,0		; HBIOS Disk Unit/Slice (filled in at boot)
 dph6:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	0, 0		; LBA Offset
 	dw	dsk$write
 	dw	dsk$read
@ -111,6 +118,7 @@ dph6:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	dsk$init
 	db	0,0		; HBIOS Disk Unit/Slice (filled in at boot)
 dph7:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	0, 0		; LBA Offset
 	dw	dsk$write
 	dw	dsk$read
@ -118,6 +126,7 @@ dph7:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	dsk$init
 	db	0,0		; HBIOS Disk Unit/Slice (filled in at boot)
 dph8:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	0, 0		; LBA Offset
 	dw	dsk$write
 	dw	dsk$read
@ -125,6 +134,7 @@ dph8:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	dsk$init
 	db	0,0		; HBIOS Disk Unit/Slice (filled in at boot)
 dph9:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	0, 0		; LBA Offset
 	dw	dsk$write
 	dw	dsk$read
@ -132,6 +142,7 @@ dph9:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	dsk$init
 	db	0,0		; HBIOS Disk Unit/Slice (filled in at boot)
 dph10:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	0, 0		; LBA Offset
 	dw	dsk$write
 	dw	dsk$read
@ -139,6 +150,7 @@ dph10:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	dsk$init
 	db	0,0		; HBIOS Disk Unit/Slice (filled in at boot)
 dph11:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	0, 0		; LBA Offset
 	dw	dsk$write
 	dw	dsk$read
@ -146,6 +158,7 @@ dph11:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	dsk$init
 	db	0,0		; HBIOS Disk Unit/Slice (filled in at boot)
 dph12:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	0, 0		; LBA Offset
 	dw	dsk$write
 	dw	dsk$read
@ -153,6 +166,7 @@ dph12:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	dsk$init
 	db	0,0		; HBIOS Disk Unit/Slice (filled in at boot)
 dph13:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	0, 0		; LBA Offset
 	dw	dsk$write
 	dw	dsk$read
@ -160,6 +174,7 @@ dph13:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	dsk$init
 	db	0,0		; HBIOS Disk Unit/Slice (filled in at boot)
 dph14:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	0, 0		; LBA Offset
 	dw	dsk$write
 	dw	dsk$read
@ -167,6 +182,7 @@ dph14:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	dsk$init
 	db	0,0		; HBIOS Disk Unit/Slice (filled in at boot)
 dph15:	dph	0,dpb$max	; Real DPB filled in at disk login
 	dw	0, 0		; LBA Offset
 	cseg	; DPB must be resident
@ -176,8 +192,8 @@ dpb$max:
 	db  	31		; blm: block mask
 	db  	1		; exm: extent mask
 	dw  	2047		; dsm: total storage in blocks - 1 = (8mb / 4k bls) - 1 = 2047
 	dw  	511		; drm: dir entries - 1 = 512 - 1 = 511
 	db  	11110000b	; al0: dir blk bit map, first byte
 	dw  	1024 - 1	; drm: dir entries - 1
 	db  	11111111b	; al0: dir blk bit map, first byte
 	db  	00000000b	; al1: dir blk bit map, second byte
 	dw  	64		; cks: directory check vector size - 256 / 4
 	dw  	0		; off: reserved tracks = 16 trks * (16 trks * 16 heads * 16 secs * 512 bytes) = 128k
@ -228,13 +244,13 @@ dpb$rf:		; 4MB RAM Floppy Drive
 	db	2		; psh: 2 for 512 byte sectors
 	db	3		; phm: (512 / 128) - 1
 dpb$hd:		; 8MB Hard Disk Drive
 dpb$hd:		; 8MB Hard Disk Drive w/ 512 dir entries
 	dw  	64		; spt: sectors per track
 	db  	5		; bsh: block shift factor
 	db  	31		; blm: block mask
 	db  	1		; exm: extent mask
 	dw  	2047		; dsm: total storage in blocks - 1 = (8mb / 4k bls) - 1 = 2047
 	dw  	511		; drm: dir entries - 1 = 512 - 1 = 511
 	dw  	512 - 1		; drm: dir entries - 1 = 512 - 1 = 511
 	db  	11110000b	; al0: dir blk bit map, first byte
 	db  	00000000b	; al1: dir blk bit map, second byte
 	dw  	8000h		; cks: directory check vector size - permanent storage = 8000H
@ -312,6 +328,20 @@ dpb_fd111:	; 8" DS/DD Floppy Drive (1.11M)
 	db	2		; psh: 2 for 512 byte sectors
 	db	3		; phm: (512 / 128) - 1
 dpb$hdnew:	; 8MB Hard Disk Drive (new format)
 	dw	64		; spt: sectors per track
 	db	5		; bsh: block shift factor
 	db	31		; blm: block mask
 	db	1		; exm: extent mask
 	dw	2048 - 1 - 4	; dsm: total storage in blocks - 1 = 2048 - 1 - resvd tracks
 	dw	1024 - 1	; drm: dir entries
 	db	11111111b	; al0: dir blk bit map, first byte
 	db	00000000b	; al1: dir blk bit map, second byte
 	dw	8000h		; cks: directory check vector size - permanent storage = 8000H
 	dw	2		; off: reserved tracks
 	db	2		; psh: 2 for 512 byte sectors
 	db	3		; phm: (512 / 128) - 1
 	dseg	; rest is banked
@ -371,48 +401,152 @@ dsk$login:
 	;ld	a,'L'
 	;call	cout
 	push	de		; save DPH ptr
 	ld	(curdph),de		; save working DPH
 	ex	de,hl			; DPH adr to HL
 	dec	hl			; point to slice 
 	ld	a,(hl)			; get slice
 	ld	(slice),a		; save it
 	dec	hl			; point to disk unit
 	ld	a,(hl)			; get unit
 	ld	(unit),a		; save it
 	call	media			; update DPH for media
 	; Need to do something on error, but bioskrnl provides
 	; no way for us to return an error.
 	;jr	nz,???
 	ret
 	; check media
 	ld	a,(@rdrv)	; get disk unit
 	;halt
 media:
 	; Set retry address
 	ld	hl,media
 	ld	(retry$adr),hl
 	; Sense media to determine media format
 	ld	a,(unit)		; Get disk unit
 	ld	c,a			; put in C
 	ld	b,18h			; HBIOS Media function
 	ld	e,1			; Enable media check/discovery
 	;rst	08
 	call	0FFF0H			; HBIOS call
 	ld	a,e		; Resultant media id to accum
 	or	a		; Set flags
 	;halt
 	;
 	; !!! Need to do something on error !!!
 	;
 	jr	nz,dsk$login0	; continue if OK
 	pop	de		; else error
 	ret			; return
 dsk$login0:
 	jp	nz,err_diskio		; handle error
 	ld	a,e			; resultant media id to accum
 	ld	(medid),a		; save media id
 	or	a			; set flags, 0 is no media
 	jp	z,err_diskio		; handle no media error
 	; Initialize slice start LBA & sectors per slice
 	ld	hl,0			; assume slice starts
 	ld	(lba),hl		; ... at LBA offset
 	ld	(lba+2),hl		; ... of zero
 	ld	hl,16640		; assume legacy value for
 	ld	(sps),hl		; ... sectors per slice
 	; If not hard disk, skip partition & slice stuff
 	ld	a,(medid)		; get media id
 	cp	4			; hard disk?
 	jr	nz,media9		; if not, jump ahead
 	; Read MBR
 	ld	de,8000h		; LBA address zero
 	ld	hl,0			; ... to read first sector
 	ld	bc,mbrsec		; read into MBR buffer
 	ld	(dma),bc		; save
 	ld	a,(0FFE0h)		; get current HBIOS bank
 	ld	(bank),a		; set DMA bank
 	ld	a,(unit)		; get bootunit
 	ld	c,a			; put in C
 	ld	b,013h			; HBIOS func: disk read
 	call	dsk$io			; do it, no return on err
 	; Check signature
 	ld	hl,(mbrsec+1FEh)	; get signature
 	ld	a,l			; first byte
 	cp	055h			; should be $55
 	jr	nz,media5		; if not, no part table
 	ld	a,h			; second byte
 	cp	0AAh			; should be $AA
 	jr	nz,media5		; if not, no part table
 	; Search part table for CP/M entry (type 0x52)
 	ld	b,4			; four entries in part table
 	ld	hl,mbrsec+1BEh+4	; offset of first part type
 media3:
 	ld	a,(hl)			; get part type
 	cp	52h			; CP/M partition?
 	jr	z,media4			; cool, grab the LBA offset
 	ld	de,16			; part table entry size
 	add	hl,de			; bump to next part type
 	djnz	media3			; loop thru table
 	jr	media5			; too bad, no CP/M partition
 media4:
 	; Capture the starting LBA of the CP/M partition we found
 	ld	de,4			; LBA is 4 bytes after part type
 	add	hl,de			; point to it
 	ld	de,lba			; loc to store lba offset
 	ld	bc,4			; 4 bytes (32 bits)
 	ldir				; copy it
 	; For now, it is implied that a slice within a partition
 	; table will be in the "new" disk format.  So, we now
 	; adjust the sectors per slice and media id.
 	; Use new slice format sectors per slice value
 	ld	hl,16384		; new sectors per slice
 	ld	(sps),hl		; save it
 	; Update media id for new hard disk format
 	ld	a,10			; new media id
 	ld	(medid),a		; save it
 media5:
 	; Adjust LBA offset based on target slice
 	ld	a,(slice)		; get boot slice, A is loop cnt
 	ld	hl,(lba)		; set DE:HL
 	ld	de,(lba+2)		; ... to starting LBA
 	ld	bc,(sps)		; sectors per slice
 boot6:
 	or	a			; set flags to check loop cntr
 	jr	z,boot8			; done if counter exhausted
 	add	hl,bc			; add one slice to low word
 	jr	nc,boot7		; check for carry
 	inc	de			; if so, bump high word
 boot7:
 	dec	a			; dec loop downcounter
 	jr	boot6			; and loop
 boot8:
 	ld	(lba),hl		; save new lba, low word
 	ld	(lba+2),de		; save new lba, high word
 media9:
 	; Locate DPB corresponding to media id
 	ld	hl,dpb$start - dpb$sz
 	ld	de,dpb$sz
 	ld	b,a		; loop count
 dsk$login1:
 	ld	a,(medid)		; get media id
 	ld	b,a			; to loop count
 media10:
 	add	hl,de			; next dpb
 	djnz	dsk$login1	; loop as needed
 	djnz	media10			; loop as needed
 	; hl is ptr to desired dpb
 	pop	de		; restore DPH ptr
 	;halt
 	; Stuff DPB ptr (HL) and LBA offset into DPH
 	; DPH: DPB @ +12, LBA @ +25
 	ld	de,(curdph)		; load DPH pointer
 	ex	de,hl			; de = DPB adr, hl = DPH adr
 	push	de			; save DPB adr
 	ld	de,12			; offset of DPB in DPH
 	add	hl,de			; hl = adr of DPB field in DPH
 	pop	de			; recover DPB adr
 	ld	(hl),e			; update LSB
 	inc	hl
 	ld	(hl),d		; udpate MSB
 	inc	hl			; point to MSB
 	ld	(hl),d			; update MSB
 	ld	de,12			; 12 more bytes to LBA
 	add	hl,de			; HL points to LBA offset field
 	ld	de,lba			; DE points to LBA offset
 	ex	de,hl			; swap for copy
 	ld	bc,4			; 4 bytes
 	ldir				; do it
 	xor	a			; signal success
 	ret				; done
 ; disk READ and WRITE entry points.
 		; these entries are called with the following arguments:
@ -429,116 +563,119 @@ dsk$login1:
 		; if necessary, then return an error code in <A>
 dsk$read:
 ;	ld	ix,30H
 ;	halt
 	ld	a,13h		; HBIOS disk read function
 	ld	(func),a	; save it
 	jr	dsk$rw		; common disk read/write code
 	;ld	a,'R'
 	;call	cout
 dsk$write:
 	ld	a,14h		; HBIOS disk write function
 	ld	(func),a	; save it
 	jr	dsk$rw		; common disk read/write code
 	push	de		; save XDPH pointer
 	call	dsk$seek	; disk seek
 	pop	hl		; restore pointer to HL
 	ret	nz		; abort on seek error
 ;
 	dec	hl		; point to unit field of XDPH
 	dec	hl
 	ld	c,(hl)		; BIOS Disk Unit in C
 	ld	b,13H		; HBIOS READ function
 	ld	hl,(@dma)	; Dest buffer adr
  if	banked
 	ld	a,(@dbnk)	; destination bank
 	call	?bnkxlt
  else
 	ld	a,(0FFE0H)	; get current bank
  endif
 	ld	d,a		; set desk bank
 	ld	e,1		; 1 sector
 	rst	08		; do it
 	;call	0FFF0H
 dsk$rw:
 	; Common disk read/write routine
 	; Assumes func is set to HBIOS read or write
 	;call	phex8
 	ret			; return
 	; Save XDPH address
 	ld	(curdph),de		; save to curdph
 ;	lxi h,read$msg		; point at " Read "
 ;	mvi a,88h ! mvi b,01h	; 1797 read + Z80DMA direction
 ;	jmp rw$common
 	; Set retry address
 	ld	hl,dsk$rw
 	ld	(retry$adr),hl
 dsk$write:
 	;ld	ix,32H
 	;halt
 	push	de		; save XDPH pointer
 	call	dsk$seek	; disk seek
 	pop	hl		; restore pointer to XDPH
 	ret	nz		; abort on seek error
 ;
 	dec	hl		; point to unit field of XDPH
 	dec	hl
 	ld	c,(hl)		; BIOS Disk Unit in C
 	ld	b,14H		; HBIOS WRITE function
 	ld	hl,(@dma)	; Dest buffer adr
  if	banked
 	ld	a,(@dbnk)	; destination bank
 	call	?bnkxlt
  else
 	ld	a,(0FFE0H)	; get current bank
  endif
 	ld	d,a		; set desk bank
 	ld	e,1		; 1 sector
 	rst	08		; do it
 	;call	0FFF0H
 	ret			; return
 ;	lxi h,write$msg		; point at " Write "
 ;	mvi a,0A8h ! mvi b,05h	; 1797 write + Z80DMA direction
 ;   ;	jmp wr$common
 dsk$seek:
 	dec	de		; point to unit field of XDPH
 	dec	de
 	ld	a,(de)		; get it
 	; Check device type
 	ld	a,(@rdrv)		; get unit
 	ld	c,a			; BIOS Disk Unit in C
 	ld	b,12H		; HBIOS SEEK function
 	push	bc		; save it
 	push	de		; save XDPH pointer
 	ld	b,17h			; HBIOS DEVICE function
 	rst	08		; Do it, D=device type
 	call	0FFF0h			; do it, D=device type
 	ld	a,d			; put in accum
 	and	0F0h			; isolate high bits
 	ld	b,1		; assume it is floppy, 1 head bit
 	ld	c,01h		; 1 bit head mask
 	cp	10h			; floppy?
 	jr	z,seek0	; yup, skip ahead
 	ld	b,4		; must be hard disk, 4 head bits
 	ld	c,0Fh		; 4 bit head mask
 seek0:
 	pop	de		; recover XDPH pointer
 	push	bc		; save bc
 	inc	de		; point to slice field of XDPH
 	ld	a,(de)		; get it
 	ld	e,a		; slice to E
 	ld	h,65		; number of tracks per slice
 	call	mult8		; HL now has track offset for slice
 	pop	bc		; recover bc
 	push	hl		; save track offset for now
 	ld	hl,(@trk)	; get track value
 	ld	a,l		; lsb of track to a
 	and	c		; apply mask
 	ld	d,a		; save in d
 seek1:                          
 	srl	h		; shift one bit out
 	rr	l		; ... of hl
 	djnz	seek1		; do all bits
 	jr	nz,dsk$rw2		; if not, do LBA i/o
 	; Floppy I/O
 	ld	de,(@sect)		; sector -> de, head(d) becomes zero
 	ld	hl,(@trk)		; track -> hl (low bit has head)
 	srl	h			; shift head bit out of hl
 	rr	l			; ... and into carry
 	rl	d			; carry bit (head) into d
 	jr	dsk$rw9			; do the disk I/O
 dsk$rw2:
 	; LBA IO: Get LBA offset from DPH
 	ld	hl,(curdph)		; HL := DPH adr
 	ld	de,25+3			; LBA value + 3
 	add	hl,de			; HL := LBA offset (last byte!)
 	ld	b,(hl)			; hibyte of hiword
 	dec	hl			; bump
 	ld	c,(hl)			; lobyte of hiword
 	dec	hl			; bump
 	push	bc			; save hiword
 	ld	b,(hl)			; hibyte of loword
 	dec	hl			; bump
 	ld	c,(hl)			; lobyte of loword
 	dec	hl			; bump
 	push	bc			; save loword
 	; Get track and shift into correct bits
 	ld	hl,(@trk)		; get track
 	ld	de,0			; clear hiword
 	ld	b,4			; x16 (16 spt assumed)
 	call	rl32			; do it
 	; Combine with sector
 	ld	a,(@sect)		; get sector
 	ld	e,a		; stuff it in e
 	ex	de,hl		; de=track, hl=head/sect
 	ex	(sp),hl		; save head/sect, hl = offset
 	add	hl,de		; hl has final track value
 	pop	de		; recover head/sect to de
 	pop	bc		; recover function & unit
 	rst	08		; perform seek
 	;call	0FFF0H
 	ret
 	or	l			; combine
 	ld	l,a			; and back to L
 	; Add in LBA offset
 	pop	bc			; lba offset loword
 	add	hl,bc			; add to cur loword
 	ex	de,hl			; swap
 	pop	bc			; lba offset hiword
 	adc	hl,bc			; add w/ carry to cur hiword
 	ex	de,hl			; swap back
 	set	7,d			; set lba access bit
 dsk$rw9:
 	; DE:HL has sector address to read (LBA or CHS)
 	ld	bc,(@dma)		; get dma address
 	ld	(dma),bc		; save for dsk$io
  if	banked
 	ld	a,(@dbnk)		; destination bank
 	call	?bnkxlt			; xlat to HBIOS
  else
 	ld	a,(0FFE0H)		; get current bank
  endif
 	ld	(bank),a
 	ld	a,(func)		; get HBIOS func code
 	ld	b,a			; put in B
 	ld	a,(@rdrv)		; get disk unit
 	ld	c,a			; put in C
 	;jr	dsk$io			; fall thru to dsk$io!
 dsk$io:
 	; Read/write a disk sector
 	; DE:HL is CHS/LBA, B is HBIOS func, C is disk unit
 	; Seek to requested sector in DE:HL
 	push	bc			; save func & unit
 	ld	b,012h			; HBIOS func: seek
 	call	0FFF0h			; do it
 	pop	bc			; recover func & unit
 	jp	nz,err_diskio		; handle error
 	; Read sector(s) into buffer
 	ld	e,1			; transfer count
 	ld	hl,(dma)		; read into info sec buffer
 	ld	a,(bank)		; HBIOS DMA bank
 	ld	d,a			; put in D
 	call	0FFF0h			; do it
 	jp	nz,err_diskio		; handle error
 	xor	a			; signal success
 	ret				; and done
 ;
 ; multiply 8-bit values
@ -557,6 +694,93 @@ mult8_noadd:
 	djnz	mult8_loop
 	ret
 rl32:
 	; Left shift DE:HL by B bits (B > 0)
 	or	a			; clear carry
 	rl	l			; rotate L thru carry
 	rl	h			; rotate H thru carry
 	rl	e			; rotate E thru carry
 	rl	d			; rotate D thru carry
 	djnz	rl32			; loop B times
 	ret				; done
 cin$echo:	; get console input, echo it, and shift to upper case
 	call	?const			; check for char
 	or	a			; set flags
 	jr	z,cin$echo1		; nope, continue
 	call	?conin			; eat extraneous char
 	jr	cin$echo		; and loop
 cin$echo1:
 	call	?conin			; get char
 	push	af			; save it
 	ld	c,a			; put in C
 	call	?cono			; echo
 	pop	af			; recover it
 	cp	'a'			; compare
 	ret	c			; done if carry
 	sub	'a' - 'A'		; make upper case
 	ret				; and done
 ;	call ?const ! ora a ! jz u$c1	; see if any char already struck
 ;	call ?conin ! jmp u$conin$echo	; yes, eat it and try again
 ;u$c1:
 ;	call ?conin ! push psw
 ;	mov c,a ! call ?cono
 ;	pop psw ! cpi 'a' ! rc
 ;	sui 'a'-'A'		; make upper case
 ;	ret
 err_nodisk:
 	ld	hl,str_err_nodisk
 	jr	err
 err_noslice:
 	ld	hl,str_err_noslice
 	jr	err
 err_diskio:
 	ld	hl,str_err_diskio
 	jr	err
 err_sig:
 	ld	hl,str_err_sig
 	jr	err
 err_api:
 	ld	hl,str_err_api
 	jr	err
 err:
 	push	hl
 	call	?pderr
 	pop	hl
 	call	?pmsg
 	ld	hl,str_err_retry
 	call	?pmsg
 	call	cin$echo
 	cp	'Y'
 	ret	nz
 	ld	hl,(retry$adr)
 	jp	(hl)
 str_err_retry	db	", Retry (Y/N) ? ",0
 str_err_nodisk	db	", No disk",0
 str_err_noslice	db	", No slice",0
 str_err_diskio	db	", Disk I/O",0
 str_err_sig	db	", No system",0
 str_err_api	db	", API failure",0
 ;
 ;
 ;
 retry$adr	dw	?wboot		; error retry address
 curdph		dw	0		; working dph value
 medid		db	0		; working media id value
 unit		db	0		; working disk unit num
 slice		db	0		; working slice num
 lba		dw	0,0		; working  lba
 sps		dw	0		; sectors per slice
 mbrsec		ds	512		; MBR sector buffer
 dma		dw	0		; current DMA address
 bank		db	0		; HBIOS DMA bank
 func		db	0		; HBIOS function
 ;rw$common:			; seek to correct track (if necessary),
 ;				;	initialize DMA controller,
 ;				;	and issue 1797 command.
--- a/Source/CPM3/genbnk.dat
+++ b/Source/CPM3/genbnk.dat
@ -8,12 +8,12 @@ MEMTOP   = FD
 BNKSWT   = Y
 COMBAS   = 80
 LERROR   = Y
 NUMSEGS  = 03
 NUMSEGS  = 04
 MEMSEG00 = 01,43,00
 MEMSEG01 = 0E,72,02
 MEMSEG02 = 01,7F,03
 MEMSEG03 = 01,7F,04
 MEMSEG04 = 00,C0,05
 MEMSEG04 = 01,7F,05
 MEMSEG05 = 00,C0,06
 MEMSEG06 = 00,C0,07
 MEMSEG07 = 00,C0,08
--- a/Source/CPM3/move.z80
+++ b/Source/CPM3/move.z80
@ -69,7 +69,8 @@ xbnkmov:
 ; 1: TPA	BID_AUX		8Ch
 ; 2: BUFS	BID_AUX-1	8Bh
 ; 3: BUFS	BID_AUX-2	8Ah
 ; ...
 ; 4: BUFS	BID_AUX-3	89h
 ; 5: BUFS	BID_AUX-4	88h
 ;
 ; N.B., Below BID_AUX is considered RAM disk bank.  Need to
 ; make sure RAM disk is kept small enough to stay below
--- a/Source/CPM3/optzpm.lib
+++ b/Source/CPM3/optzpm.lib
@ -1,5 +1,4 @@
 	; global assembler options for BANKED BIOS
 	; with Boot Drive swapped into Drive A
 	; global assembler options for ZPM BIOS
 true	equ -1
 false	equ not true
--- a/Source/CPM3/util.z80
+++ b/Source/CPM3/util.z80
@ -51,7 +51,7 @@ bin2bcd1:
 	pop	bc
 	ret
 	if 0
 	if 1
 ;
 ; Print the hex word value in HL
 ;
--- a/Source/HBIOS/diskdefs
+++ b/Source/HBIOS/diskdefs
@ -297,121 +297,158 @@ diskdef wbw_rom1024
  os 2.2
 end
 # UNA 512KB ROM (128KB reserved, 384KB ROM Disk)
 # RomWBW 720K floppy media
 diskdef wbw_fd720
  seclen 512
  tracks 160
  sectrk 9
  blocksize 2048
  maxdir 128
  skew 0
  boottrk 4
  os 2.2
 end
 diskdef una_rom512
 # RomWBW 1.44M floppy media
 diskdef wbw_fd144
  seclen 512
  tracks 12
  sectrk 64
  tracks 160
  sectrk 18
  blocksize 2048
  maxdir 256
  skew 0
  boottrk 0
  boottrk 2
  os 2.2
 end
 # UNA 512KB ROM (128KB reserved, 896KB ROM Disk)
 # RomWBW 360K floppy media
 diskdef wbw_fd360
  seclen 512
  tracks 80
  sectrk 9
  blocksize 2048
  maxdir 128
  skew 0
  boottrk 4
  os 2.2
 end
 diskdef una_rom1024
 # RomWBW 1.20M floppy media
 diskdef wbw_fd120
  seclen 512
  tracks 28
  sectrk 64
  tracks 160
  sectrk 15
  blocksize 2048
  maxdir 256
  skew 0
  boottrk 0
  boottrk 2
  os 2.2
 end
 # RomWBW 8MB Hard Disk, LU 0-3
 # RomWBW 8MB Hard Disk, first 4 slices
 # Legacy format, 512 dir entries, 8,320 sectors / slice
 diskdef wbw_hd0
  seclen 512
  tracks 65
  sectrk 256
  tracks 1040
  sectrk 16
  blocksize 4096
  maxdir 512
  skew 0
  boottrk 1
  boottrk 16
  os 2.2
 end
 diskdef wbw_hd1
  seclen 512
  tracks 130
  sectrk 256
  tracks 2080
  sectrk 16
  blocksize 4096
  maxdir 512
  skew 0
  boottrk 66
  boottrk 1056
  os 2.2
 end
 diskdef wbw_hd2
  seclen 512
  tracks 195
  sectrk 256
  tracks 3120
  sectrk 16
  blocksize 4096
  maxdir 512
  skew 0
  boottrk 131
  boottrk 2096
  os 2.2
 end
 diskdef wbw_hd3
  seclen 512
  tracks 260
  sectrk 256
  tracks 4160
  sectrk 16
  blocksize 4096
  maxdir 512
  skew 0
  boottrk 196
  boottrk 3136
  os 2.2
 end
 # RomWBW 720K floppy media
 diskdef wbw_fd720
 # RomWBW 8MB Hard Disk
 # New format, 1024 dir entries, 8,192 sectors / slice
 # Pure filesystem image, no prefix
 diskdef wbw_hd_new
  seclen 512
  tracks 160
  sectrk 9
  blocksize 2048
  maxdir 128
  tracks 1024
  sectrk 16
  blocksize 4096
  maxdir 1024
  skew 0
  boottrk 4
  boottrk 2
  os 2.2
 end
 # RomWBW 1.44M floppy media
 diskdef wbw_fd144
 # RomWBW 8MB Hard Disk, first 4 slices
 # New format, 1024 dir entries, 8,192 sectors / slice
 # Assumes 256 sector (16 track) hard disk prefix
 diskdef wbw_hd0_new
  seclen 512
  tracks 160
  sectrk 18
  blocksize 2048
  maxdir 256
  tracks 1040
  sectrk 16
  blocksize 4096
  maxdir 1024
  skew 0
  boottrk 2
  boottrk 18
  os 2.2
 end
 # RomWBW 360K floppy media
 diskdef wbw_fd360
 diskdef wbw_hd1_new
  seclen 512
  tracks 80
  sectrk 9
  blocksize 2048
  maxdir 128
  tracks 2064
  sectrk 16
  blocksize 4096
  maxdir 1024
  skew 0
  boottrk 4
  boottrk 1042
  os 2.2
 end
 # RomWBW 1.20M floppy media
 diskdef wbw_fd120
 diskdef wbw_hd2_new
  seclen 512
  tracks 160
  sectrk 15
  blocksize 2048
  maxdir 256
  tracks 3112
  sectrk 16
  blocksize 4096
  maxdir 1024
  skew 0
  boottrk 2
  boottrk 2066
  os 2.2
 end
 diskdef wbw_hd3_new
  seclen 512
  tracks 4136
  sectrk 16
  blocksize 4096
  maxdir 1024
  skew 0
  boottrk 3114
  os 2.2
 end
--- a/Source/HBIOS/romldr.asm
+++ b/Source/HBIOS/romldr.asm
@ -106,7 +106,7 @@ bid_cur	.equ	-1	; used below to indicate current bank
 ;
 start:
 	ld	sp,bl_stack		; setup private stack
 	call	DELAY_INIT		; init delay functions
 	call	delay_init		; init delay functions
 ;
 ; Disable interrupts if IM1 is active because we are switching to page
 ; zero in user bank and it has not been prepared with IM1 vector yet.
@ -456,7 +456,7 @@ setcon:
 	ld	hl,str_newcon		; new console msg
 	call	pstr			; print string on cur console
 	pop	af			; restore new console unit
 	call	PRTDECB			; print unit num
 	call	prtdecb			; print unit num
 ;
 	; Set console unit
 	ld	b,BF_SYSPOKE		; HBIOS func: POKE
@ -479,7 +479,7 @@ setcon:
 reboot:
 	ld	hl,str_reboot		; point to message
 	call	pstr			; print it
 	call	LDELAY			; wait for message to display
 	call	ldelay			; wait for message to display
 ;
 #if (BIOS == BIOS_WBW)
 ;
@ -618,11 +618,11 @@ diskboot:
 	ld	hl,str_boot1
 	call	pstr
 	ld	a,(bootunit)
 	call	PRTDECB
 	call	prtdecb
 	ld	hl,str_boot2
 	call	pstr
 	ld	a,(bootslice)
 	call	PRTDECB
 	call	prtdecb
 ;
 #if (DSKYENABLE)
 	ld	hl,msg_load		; point to load message
@ -632,13 +632,21 @@ diskboot:
 #if (BIOS == BIOS_WBW)
 ;
 	; Check that drive actually exists
 	ld	c,a			; put in C for func call
 	;ld	c,a			; put in C for func call
 	ld	b,BF_SYSGET		; HBIOS func: sys get
 	ld	c,BF_SYSGET_DIOCNT	; HBIOS sub-func: disk count
 	rst	08			; do it, E=disk count
 	ld	a,(bootunit)		; get boot disk unit
 	cp	e			; compare to count
 	jp	nc,err_nodisk		; handle no disk err
 ;
 	; Sense media
 	ld	a,(bootunit)		; get boot disk unit
 	ld	c,a			; put in C for func call
 	ld	b,BF_DIOMEDIA		; HBIOS func: media
 	ld	e,1			; enable media check/discovery
 	rst	08			; do it
 	jp	nz,err_diskio		; handle error
 ;
 	; If non-zero slice requested, confirm device can handle it
 	ld	a,(bootslice)		; get slice
@ -652,40 +660,6 @@ diskboot:
 	cp	DIODEV_IDE		; IDE is max slice device type
 	jp	c,err_noslice		; no such slice, handle err
 ;
 diskboot1:
 	; Sense media
 	ld	a,(bootunit)		; get boot disk unit
 	ld	c,a			; put in C for func call
 	ld	b,BF_DIOMEDIA		; HBIOS func: media
 	ld	e,1			; enable media check/discovery
 	rst	08			; do it
 	jp	nz,err_diskio		; handle error
 	call	pdot			; show progress
 ;
 	; Seek to boot info sector, third sector
 	ld	a,(bootslice)		; get boot slice
 	ld	e,a			; move to E for mult
 	ld	h,65			; 65 tracks per slice
 	call	MULT8			; hl := h * e
 	ld	de,$0002		; head 0, sector 2
 	ld	b,BF_DIOSEEK		; HBIOS func: seek
 	ld	a,(bootunit)		; get boot disk unit
 	ld	c,a			; put in C
 	rst	08			; do it
 	jp	nz,err_diskio		; handle error
 	call	pdot			; show progress
 ;
 	; Read sector into local buffer
 	ld	b,BF_DIOREAD		; HBIOS func: disk read
 	ld	a,(bootunit)		; get boot disk unit
 	ld	c,a			; put in C for func call
 	ld	hl,bl_infosec		; read into info sec buffer
 	ld	d,BID_USR		; user bank
 	ld	e,1			; transfer one sector
 	rst	08			; do it
 	jp	nz,err_diskio		; handle error
 	call	pdot			; show progress
 ;
 #endif
 ;
 #if (BIOS == BIOS_UNA)
@ -712,12 +686,67 @@ diskboot1:
 	jr	z,diskboot1		; if so, OK
 	jp	err_noslice		; no such slice, handle err
 ;
 #endif
 ;
 diskboot1:
 	; Initialize working LBA value
 	ld	hl,0			; zero HL
 	ld	(lba),hl		; init
 	ld	(lba+2),hl		; ... LBA
 ;
 	; Set legacy sectors per slice
 	ld	hl,16640		; legacy sectors per slice
 	ld	(sps),hl		; save it
 ;
 	; Attempt to read MBR
 	ld	de,0			; MBR is at
 	ld	hl,0			; ... first sector
 	ld	bc,bl_mbrsec		; read into MBR buffer
 	ld	(dma),bc		; save
 	ld	b,1			; one sector
 	ld	a,(bootunit)		; get bootunit
 	ld	c,a			; put in C
 	call	diskread		; do it
 	ret	nz			; abort on error
 ;
 	; Check signature
 	ld	hl,(bl_mbrsec+$1FE)	; get signature
 	ld	a,l			; first byte
 	cp	$55			; should be $55
 	jr	nz,diskboot1c		; if not, no part table
 	ld	a,h			; second byte
 	cp	$AA			; should be $AA
 	jr	nz,diskboot1c		; if not, no part table
 ;
 	; Try to find our entry in part table and capture lba offset
 	ld	b,4			; four entries in part table
 	ld	hl,bl_mbrsec+$1BE+4	; offset of first entry part type
 diskboot1a:
 	ld	a,(hl)			; get part type
 	cp	$52			; cp/m partition?
 	jr	z,diskboot1b		; cool, grab the lba offset
 	ld	de,16			; part table entry size
 	add	hl,de			; bump to next entry part type
 	djnz	diskboot1a		; loop thru table
 	jr	diskboot1c		; too bad, no cp/m partition
 ;
 diskboot1b:
 	; Capture the starting LBA of the CP/M partition we found
 	ld	de,4			; LBA is 4 bytes after part type
 	add	hl,de			; point to it
 	ld	de,lba			; loc to store lba offset
 	ld	bc,4			; 4 bytes (32 bits)
 	ldir				; copy it
 	; If boot from partition, use new sectors per slice value
 	ld	hl,16384		; new sectors per slice
 	ld	(sps),hl		; save it
 ;
 diskboot1c:
 	; Add slice offset
 	ld	a,(bootslice)		; get boot slice, A is loop cnt
 	ld	hl,0			; DE:HL is LBA
 	ld	de,0			; ... initialize to zero
 	ld	bc,16640		; sectors per slice
 	ld	hl,(lba)		; set DE:HL
 	ld	de,(lba+2)		; ... to starting LBA
 	ld	bc,(sps)		; sectors per slice
 diskboot2:
 	or	a			; set flags to check loop ctr
 	jr	z,diskboot4		; done if counter exhausted
@ -729,30 +758,30 @@ diskboot3:
 	jr	diskboot2		; and loop
 ;
 diskboot4:
 	ld	(loadlba),hl		; save lba, low word
 	ld	(loadlba+2),de		; save lba, high word
 	ld	(lba),hl		; update lba, low word
 	ld	(lba+2),de		; update lba, high word
 ;
 	; Seek to boot info sector, third sector
 	push	hl			; save HL
 	ld	hl,str_ldsec		; display prefix
 	call	pstr			; do it
 	pop	hl			; restore HL
 	call	prthex32		; display starting sector
 	call	pdot			; show progress
 ;
 	; Read boot info sector, third sector
 	ld	bc,2			; sector offset
 	add	hl,bc			; add to LBA value low word
 	jr	nc,diskboot5		; check for carry
 	inc	de			; if so, bump high word
 diskboot5:
 	ld	a,(bootunit)		; get disk unit to boot
 	ld	b,a			; put in B for func call
 	ld	c,$41			; UNA func: set lba
 	rst	08			; set lba
 	jp	nz,err_api		; handle error
 	ld	bc,bl_infosec		; read buffer
 	ld	(dma),bc		; save
 	ld	a,(bootunit)		; disk unit to read
 	ld	c,a			; put in C
 	ld	b,1			; one sector
 	call	diskread		; do it
 	ret	nz			; abort on error
 	call	pdot			; show progress
 ;
 	; Read sector into local buffer
 	ld	c,$42			; UNA func: read sectors
 	ld	de,bl_infosec		; dest of cpm image
 	ld	l,1			; sectors to read
 	rst	08			; do read
 	jp	nz,err_diskio		; handle error
 ;
 #endif
 ;
 	; Check signature
 	ld	de,(bb_sig)		; get signature read
@ -762,6 +791,7 @@ diskboot5:
 	ld	a,$5A			; expected value of second byte
 	cp	e			; compare
 	jp	nz,err_sig		; handle error
 	call	pdot			; show progress
 ;
 	; Print disk boot info
 	; Volume "xxxxxxx" (0xXXXX-0xXXXX, entry @ 0xXXXX)
@ -774,17 +804,17 @@ diskboot5:
 	call	pstr			; print
 	push	hl			; save string ptr
 	ld	bc,(bb_cpmloc)		; get load loc
 	call	PRTHEXWORD		; print it
 	call	prthexword		; print it
 	pop	hl			; restore string ptr
 	call	pstr			; print
 	push	hl			; save string ptr
 	ld	bc,(bb_cpmend)		; get load end
 	call	PRTHEXWORD		; print it
 	call	prthexword		; print it
 	pop	hl			; restore string ptr
 	call	pstr			; print
 	push	hl			; save string ptr
 	ld	bc,(bb_cpment)		; get load end
 	call	PRTHEXWORD		; print it
 	call	prthexword		; print it
 	pop	hl			; restore string ptr
 	call	pstr			; print
 ;
@ -798,19 +828,25 @@ diskboot5:
 	ld	(loadcnt),a		; ... and save it
 	call	pdot			; show progress
 ;
 #if (BIOS == BIOS_WBW)
 ;
 	; Load image into memory
 	ld	b,BF_DIOREAD		; HBIOS func: read sectors
 	; Start OS load at sector 3
 	ld	hl,(lba)		; low word of saved LBA
 	ld	de,(lba+2)		; high word of saved LBA
 	ld	bc,3			; offset for sector 3
 	add	hl,bc			; apply it
 	jr	nc,diskboot6		; check for carry
 	inc	de			; bump high word if so
 diskboot6:
 	ld	bc,(bb_cpmloc)		; load address
 	ld	(dma),bc		; and save it
 	ld	a,(loadcnt)		; get sectors to read
 	ld	b,a			; put in B
 	ld	a,(bootunit)		; get boot disk unit
 	ld	c,a			; put in C
 	ld	hl,(bb_cpmloc)		; load address
 	ld	d,BID_USR		; user bank
 	ld	a,(loadcnt)		; get sectors to read
 	ld	e,a			; number of sectors to load
 	rst	08			; do it
 	jp	nz,err_diskio		; handle errors
 	call	diskread		; read image
 	ret	nz			; abort on error
 	call	pdot			; show progress
 ;
 #if (BIOS == BIOS_WBW)
 ;
 	; Record boot unit/slice
 	ld	b,BF_SYSSET		; hb func: set hbios parameter
@ -823,36 +859,10 @@ diskboot5:
 	ld	e,a			; save in E
 	rst	08
 	jp	nz,err_api		; handle errors
 	call	pdot			; show progress
 ;
 #endif
 ;
 #if (BIOS == BIOS_UNA)
 ;
 	; Start os load at sector 3
 	ld	hl,(loadlba)		; low word of saved LBA
 	ld	de,(loadlba+2)		; high word of saved LBA
 	ld	bc,3			; offset for sector 3
 	add	hl,bc			; apply it
 	jr	nc,diskboot6		; check for carry
 	inc	de			; bump high word if so
 diskboot6:
 	ld	c,$41			; UNA func: set lba
 	ld	a,(bootunit)		; get boot disk unit
 	ld	b,a			; move to B
 	rst	08			; set lba
 	jp	nz,err_api		; handle error
 ;
 	; Read OS image into memory
 	ld	c,$42			; UNA func: read sectors
 	ld	a,(bootunit)		; get boot disk unit
 	ld	b,a			; move to B
 	ld	de,(bb_cpmloc)		; dest of cpm image
 	ld	a,(loadcnt)		; get sectors to read
 	ld	l,a			; sectors to read
 	rst	08			; do read
 	jp	nz,err_diskio		; handle error
 	call	pdot			; show progress
 ;
 	; Record boot unit/slice
 	; UNA provides only a single byte to record the boot unit
@ -876,6 +886,8 @@ diskboot6:
 	call	pdot			; show progress
 ;
 #endif
 ;
 	call	pdot			; show progress
 ;
 #if (DSKYENABLE)
 	ld	hl,msg_go		; point to go message
@ -886,6 +898,55 @@ diskboot6:
 	ld	hl,(bb_cpment)		; get entry vector
 	jp	(hl)			; and go there
 ;
 ; Read disk sector(s)
 ; DE:HL is LBA, B is sector count, C is disk unit
 ;
 diskread:
 ;
 #if (BIOS == BIOS_UNA)
 ;
 	; Seek to requested sector in DE:HL
 	push	bc			; save unit and count
 	ld	b,c			; unit to read in B
 	ld	c,$41			; UNA func: set lba
 	rst	08			; set lba
 	pop	bc			; recover unit and count
 	jp	nz,err_api		; handle error
 ;
 	; Read sector(s) into buffer
 	ld	l,b			; sectors to read
 	ld	b,c			; unit to read in B
 	ld	c,$42			; UNA func: read sectors
 	ld	de,(dma)		; dest for read
 	rst	08			; do read
 	jp	nz,err_diskio		; handle error
 	xor	a			; signal success
 	ret				; and done
 ;
 #endif
 ;
 #if (BIOS == BIOS_WBW)
 ;
 	; Seek to requested sector in DE:HL
 	push	bc			; save unit & count
 	set	7,d			; set LBA access flag
 	ld	b,BF_DIOSEEK		; HBIOS func: seek
 	rst	08			; do it
 	pop	bc			; recover unit & count
 	jp	nz,err_diskio		; handle error
 ;
 	; Read sector(s) into buffer
 	ld	e,b			; transfer count
 	ld	b,BF_DIOREAD		; HBIOS func: disk read
 	ld	hl,(dma)		; read into info sec buffer
 	ld	d,BID_USR		; user bank
 	rst	08			; do it
 	jp	nz,err_diskio		; handle error
 	xor	a			; signal success
 	ret				; and done
 ;
 #endif
 ;
 ;=======================================================================
 ; Utility functions
 ;=======================================================================
@ -1079,6 +1140,269 @@ isnum1:
 	or	$FF		; set NZ
 	ret			; and done
 ;
 ; Delay 16us (cpu speed compensated) incuding call/ret invocation
 ; Register A and flags destroyed
 ; No compensation for z180 memory wait states
 ; There is an overhead of 3ts per invocation
 ;   Impact of overhead diminishes as cpu speed increases
 ;
 ; cpu scaler (cpuscl) = (cpuhmz - 2) for 16us + 3ts delay
 ;   note: cpuscl must be >= 1!
 ;
 ; example: 8mhz cpu (delay goal is 16us)
 ;   loop = ((6 * 16) - 5) = 91ts
 ;   total cost = (91 + 40) = 131ts
 ;   actual delay = (131 / 8) = 16.375us
 ;
 	; --- total cost = (loop cost + 40) ts -----------------+
 delay:				; 17ts (from invoking call)	|
 	ld	a,(cpuscl)	; 13ts				|
 ;								|
 delay1:				;				|
 	; --- loop = ((cpuscl * 16) - 5) ts ------------+	|
 	dec	a		; 4ts			|	|
 #if (BIOS == BIOS_WBW)	;			|	|
  #if (CPUFAM == CPU_Z180)	;			|	|
 	or	a		; +4ts for z180		|	|
  #endif			;			|	|
 #endif			;			|	|
 	jr	nz,delay1	; 12ts (nz) / 7ts (z)	|	|
 	; ----------------------------------------------+	|
 ;								|
 	ret			; 10ts (return)			|
 	;-------------------------------------------------------+
 ;
 ; Delay 16us * DE (cpu speed compensated)
 ; Register DE, A, and flags destroyed
 ; No compensation for z180 memory wait states
 ; There is a 27ts overhead for call/ret per invocation
 ;   Impact of overhead diminishes as DE and/or cpu speed increases
 ;
 ; cpu scaler (cpuscl) = (cpuhmz - 2) for 16us outer loop cost
 ;   note: cpuscl must be > 0!
 ;
 ; Example: 8MHz cpu, DE=6250 (delay goal is .1 sec or 100,000us)
 ;   inner loop = ((16 * 6) - 5) = 91ts
 ;   outer loop = ((91 + 37) * 6250) = 800,000ts
 ;   actual delay = ((800,000 + 27) / 8) = 100,003us
 ;
 	; --- total cost = (outer loop + 27) ts ------------------------+
 vdelay:				; 17ts (from invoking call)		|
 ;									|
 	; --- outer loop = ((inner loop + 37) * de) ts ---------+	|
 	ld	a,(cpuscl)	; 13ts				|	|
 ;								|	|
 vdelay1:			;				|	|
 	; --- inner loop = ((cpuscl * 16) - 5) ts ------+	|	|
 #if (BIOS == BIOS_WBW)		;			|	|	|
  #if (CPUFAM == CPU_Z180)	;			|	|	|
 	or	a		; +4ts for z180		|	|	|
  #endif			;			|	|	|
 #endif				;			|	|	|
 	dec	a		; 4ts			|	|	|
 	jr	nz,vdelay1	; 12ts (nz) / 7ts (z)	|	|	|
 	; ----------------------------------------------+	|	|
 ;								|	|
 	dec	de		; 6ts				|	|
 #if (BIOS == BIOS_WBW)		;				|	|	|
  #if (CPUFAM == CPU_Z180)	;				|	|
 	or	a		; +4ts for z180			|	|
  #endif			;				|	|
 #endif				;				|	|
 	ld	a,d		; 4ts				|	|
 	or	e		; 4ts				|	|
 	jp	nz,vdelay	; 10ts				|	|
 	;-------------------------------------------------------+	|
 ;									|
 	ret			; 10ts (final return)			|
 	;---------------------------------------------------------------+
 ;
 ; Delay about 0.5 seconds
 ; 500000us / 16us = 31250
 ;
 ldelay:
 	push	af
 	push	de
 	ld	de,31250
 	call	vdelay
 	pop	de
 	pop	af
 	ret
 ;
 ; Initialize delay scaler based on operating cpu speed
 ; HBIOS *must* be installed and available via rst 8!!!
 ; CPU scaler := max(1, (phimhz - 2))
 ;
 delay_init:
 #if (BIOS == BIOS_UNA)
 	ld	c,$F8			; UNA bios get phi function
 	rst	08			; returns speed in hz in de:hl
 	ld	b,4			; divide mhz in de:hl by 100000h
 delay_init0:
 	srl	d			; ... to get approx cpu speed in
 	rr	e			; ...mhz.  throw away hl, and
 	djnz	delay_init0		; ...right shift de by 4.
 	inc	e			; fix up for value truncation
 	ld	a,e			; put in a
 #else
 	ld	b,BF_SYSGET		; HBIOS func=get sys info
 	ld	c,BF_SYSGET_CPUINFO	; HBIOS subfunc=get cpu info
 	rst	08			; call HBIOS, rst 08 not yet installed
 	ld	a,l			; put speed in mhz in accum
 #endif
 	cp	3			; test for <= 2 (special handling)
 	jr	c,delay_init1		; if <= 2, special processing
 	sub	2			; adjust as required by delay functions
 	jr	delay_init2		; and continue
 delay_init1:
 	ld	a,1			; use the min value of 1
 delay_init2:
 	ld	(cpuscl),a		; update cpu scaler value
 	ret
 #if (CPUMHZ < 3)
 cpuscl	.db	1			; cpu scaler must be > 0
 #else
 cpuscl	.db	CPUMHZ - 2		; otherwise 2 less than phi mhz
 #endif
 ;
 ; Print value of a in decimal with leading zero suppression
 ;
 prtdecb:
 	push	hl
 	push	af
 	ld	l,a
 	ld	h,0
 	call	prtdec
 	pop	af
 	pop	hl
 	ret
 ;
 ; Print value of HL in decimal with leading zero suppression
 ;
 prtdec:
 	push	bc
 	push	de
 	push	hl
 	ld	e,'0'
 	ld	bc,-10000
 	call	prtdec1
 	ld	bc,-1000
 	call	prtdec1
 	ld	bc,-100
 	call	prtdec1
 	ld	c,-10
 	call	prtdec1
 	ld	e,0
 	ld	c,-1
 	call	prtdec1
 	pop	hl
 	pop	de
 	pop	bc
 	ret
 prtdec1:
 	ld	a,'0' - 1
 prtdec2:
 	inc	a
 	add	hl,bc
 	jr	c,prtdec2
 	sbc	hl,bc
 	cp	e
 	jr	z,prtdec3
 	ld	e,0
 	call	cout
 prtdec3:
 	ret
 ;
 ; Short delay functions.  No clock speed compensation, so they
 ; will run longer on slower systems.  The number indicates the
 ; number of call/ret invocations.  A single call/ret is
 ; 27 t-states on a z80, 25 t-states on a z180.
 ;
 ;			; z80	z180
 ;			; ----	----
 dly64:	call	dly32	; 1728	1600
 dly32:	call	dly16	; 864	800
 dly16:	call	dly8	; 432	400
 dly8:	call	dly4	; 216	200
 dly4:	call	dly2	; 108	100
 dly2:	call	dly1	; 54	50
 dly1:	ret		; 27	25
 ;
 ; Add hl,a
 ;
 ;   A register is destroyed!
 ;
 addhla:
 	add	a,l
 	ld	l,a
 	ret	nc
 	inc	h
 	ret
 ;
 ; Print the hex byte value in A
 ;
 prthexbyte:
 	push	af
 	push	de
 	call	hexascii
 	ld	a,d
 	call	cout
 	ld	a,e
 	call	cout
 	pop	de
 	pop	af
 	ret
 ;
 ; Print the hex word value in BC
 ;
 prthexword:
 	push	af
 	ld	a,b
 	call	prthexbyte
 	ld	a,c
 	call	prthexbyte
 	pop	af
 	ret
 ;
 ; Print the hex dword value in DE:HL
 ;
 prthex32:
 	push	bc
 	push	de
 	pop	bc
 	call	prthexword
 	push	hl
 	pop	bc
 	call	prthexword
 	pop	bc
 	ret
 ;
 ; Convert binary value in A to ASCII hex characters in DE
 ;
 hexascii:
 	ld	d,a
 	call	hexconv
 	ld	e,a
 	ld	a,d
 	rlca
 	rlca
 	rlca
 	rlca
 	call	hexconv
 	ld	d,a
 	ret
 ;
 ; Convert low nibble of A to ASCII hex
 ;
 hexconv:
 	and	0Fh	     ; low nibble only
 	add	a,90h
 	daa
 	adc	a,40h
 	daa
 	ret
 ;
 ;=======================================================================
 ; Console character I/O helper routines (registers preserved)
 ;=======================================================================
@ -1241,7 +1565,7 @@ prtall1:
 	ld	hl,str_disk		; prefix string
 	call	pstr			; display it
 	ld	a,c			; index
 	call	PRTDECB			; print it
 	call	prtdecb			; print it
 	ld	hl,str_on		; separator string
 	call	pstr
 	push	bc			; save loop control
@ -1268,7 +1592,7 @@ prtdrv:
 	and	$0F			; isolate device bits
 	add	a,a			; multiple by two for word table
 	ld	hl,devtbl		; point to start of table
 	call	ADDHLA			; add A to HL for table entry
 	call	addhla			; add A to HL for table entry
 	ld	a,(hl)			; deref HL for string adr
 	inc	hl			; ...
 	ld	h,(hl)			; ...
@ -1277,7 +1601,7 @@ prtdrv:
 	pop	hl			; recover HL
 	pop	de			; recover DE
 	ld	a,e			; device number
 	call	PRTDECB			; print it
 	call	prtdecb			; print it
 	ld	a,':'			; suffix
 	call	cout			; print it
 	ret
@ -1340,7 +1664,7 @@ prtdrv:
 	ld	hl,str_disk		; prefix string
 	call	pstr			; display it
 	ld	a,b			; index
 	call	PRTDECB			; print it
 	call	prtdecb			; print it
 	ld	a,' '			; formatting
 	call	cout			; do it
 	ld	a,'='			; formatting
@ -1380,7 +1704,7 @@ prtdrv2:	; print device
 	pop	bc			; recover unit
 	call	pstr			; print device name
 	ld	a,b			; unit to a
 	call	PRTDECB			; print it
 	call	prtdecb			; print it
 	ld	a,':'			; device name suffix
 	call	cout			; print it
 	ret				; done
@ -1452,10 +1776,12 @@ str_err_api	.db	"Unexpected hardware BIOS API failure",0
 ;=======================================================================
 ;
 #define USEDELAY
 #include "util.asm"
 ; #include "util.asm"
 ;
 #if (DSKYENABLE)
 #define	DSKY_KBD
 VDELAY	.equ	vdelay
 DLY2	.equ	dly2
 #include "dsky.asm"
 #endif
 ;
@ -1492,6 +1818,7 @@ str_binfo2	.db	$22," [0x",0
 str_binfo3	.db	"-0x",0
 str_binfo4	.db	", entry @ 0x",0
 str_binfo5	.db	"]",0
 str_ldsec	.db	", Sector 0x",0
 ;
 str_help	.db	"\r\n"
 		.db	"\r\n  L         - List ROM Applications"
@ -1651,9 +1978,12 @@ bid_ldr		.ds	1		; bank at startup
 #endif
 #if (BIOS == BIOS_UNA)
 bid_ldr		.ds	2		; bank at startup
 loadlba		.ds	4		; lba for load, dword
 #endif
 ;
 lba		.ds	4		; lba for load, dword
 dma		.ds	2		; address for load
 sps		.ds	2		; sectors per slice
 ;
 ra_tbl_loc	.ds	2		; points to active ra_tbl
 bootunit	.ds	1		; boot disk unit
 bootslice	.ds	1		; boot disk slice
@ -1685,5 +2015,11 @@ bb_biloc	.ds	2		; loc to patch boot drive info
 bb_cpmloc	.ds	2		; final ram dest for cpm/cbios
 bb_cpmend	.ds	2		; end address for load
 bb_cpment	.ds	2		; CP/M entry point (cbios boot)
 ;
 ;
 ; Master Boot Record sector is read into area below.
 ;
 bl_mbrsec	.equ	$
 		.ds	512
 ;
 	.end
--- a/Source/Images/Build.cmd
+++ b/Source/Images/Build.cmd
@ -4,24 +4,24 @@ setlocal
 echo.
 echo Building Floppy Disk Images...
 echo.
 call BuildFD.cmd cpm22 ..\cpm22\cpm_wbw.sys
 call BuildFD.cmd zsdos ..\zsdos\zsys_wbw.sys
 call BuildFD.cmd nzcom ..\zsdos\zsys_wbw.sys
 call BuildFD.cmd cpm3 ..\cpm3\cpmldr.sys
 call BuildFD.cmd zpm3 ..\cpm3\cpmldr.sys
 call BuildFD.cmd ws4
 call BuildFD.cmd cpm22 wbw_fd144 ..\cpm22\cpm_wbw.sys
 call BuildFD.cmd zsdos wbw_fd144 ..\zsdos\zsys_wbw.sys
 call BuildFD.cmd nzcom wbw_fd144 ..\zsdos\zsys_wbw.sys
 call BuildFD.cmd cpm3 wbw_fd144 ..\cpm3\cpmldr.sys
 call BuildFD.cmd zpm3 wbw_fd144 ..\cpm3\cpmldr.sys
 call BuildFD.cmd ws4 wbw_fd144
 echo.
 echo Building Hard Disk Images...
 echo.
 call BuildHD.cmd cpm22 ..\cpm22\cpm_wbw.sys
 call BuildHD.cmd zsdos ..\zsdos\zsys_wbw.sys
 call BuildHD.cmd nzcom ..\zsdos\zsys_wbw.sys
 call BuildHD.cmd cpm3 ..\cpm3\cpmldr.sys
 call BuildHD.cmd zpm3 ..\cpm3\cpmldr.sys
 call BuildHD.cmd ws4
 call BuildHD.cmd cpm22 wbw_hd0 ..\cpm22\cpm_wbw.sys
 call BuildHD.cmd zsdos wbw_hd0 ..\zsdos\zsys_wbw.sys
 call BuildHD.cmd nzcom wbw_hd0 ..\zsdos\zsys_wbw.sys
 call BuildHD.cmd cpm3 wbw_hd0 ..\cpm3\cpmldr.sys
 call BuildHD.cmd zpm3 wbw_hd0 ..\cpm3\cpmldr.sys
 call BuildHD.cmd ws4 wbw_hd0
 if exist ..\BPBIOS\bpbio-ww.rel call BuildHD.cmd bp
 if exist ..\BPBIOS\bpbio-ww.rel call BuildHD.cmd bp wbw_hd
 echo.
 echo Building Combo Disk Image...
--- a/Source/Images/BuildFD.ps1
+++ b/Source/Images/BuildFD.ps1
@ -1,10 +1,9 @@
 #Param([Parameter(Mandatory)]$Disk, $SysFile="")
 Param($Disk, $SysFile="")
 Param($Disk, $Format="wbw_fd144", $SysFile="")
 $ErrorAction = 'Stop'
 $ImgFile = "fd_${Disk}.img"
 $Fmt = "wbw_fd144"
 $MediaID = 6
 $Size = 1440KB
 $CpmToolsPath = '../../Tools/cpmtools'
@ -13,35 +12,31 @@ $env:PATH = $CpmToolsPath + ';' + $env:PATH
 if (-not (Test-Path("d_${Disk}/")))
 {
 	"Source directory d_${Disk} for disk ${Disk} not found!"
 	Write-Error "Source directory d_${Disk} for disk ${Disk} not found!" -ErrorAction Stop 
 	return
 }
 "Generating Floppy Disk ${Disk}..."
 #$Blank = ([string]([char]0xE5)) * $Size
 #Set-Content -Value $Blank -NoNewLine -Path $ImgFile
 $Blank = ([byte[]](0xE5) * $Size)
 [System.IO.File]::WriteAllBytes($ImgFile, $Blank)
 if ($SysFile.Length -gt 0) 
 {
 	"Adding System Image $SysFile..."
 	#$Sys = Get-Content -Path "$SysFile.sys" -Raw
 	#$Img = Get-Content -Path $ImgFile -Raw
 	#$NewImg = $Sys + $Img.SubString($Sys.Length, $Img.Length - $Sys.Length)
 	#Set-Content -NoNewLine -Path $ImgFile $NewImg
 	{ [byte[]]$SysImg = [System.IO.File]::ReadAllBytes($SysFile) }
 else 
 	{ [byte[]]$SysImg = @() }
 	$Cmd = "mkfs.cpm -f $Fmt -b $SysFile $ImgFile"
 	$Cmd
 	Invoke-Expression $Cmd
 }
 $Image = ($SysImg + ([byte[]](0xE5) * ($Size - $SysImg.length)))
 $Image[1410] = 0x4D
 $Image[1411] = 0x49
 $Image[1412] = 0x44
 $Image[1413] = $MediaID
 [System.IO.File]::WriteAllBytes($ImgFile, $Image)
 for ($Usr=0; $Usr -lt 16; $Usr++)
 {
 	if (Test-Path ("d_${Disk}/u${Usr}/*")) 
 	{
 		$Cmd = "cpmcp -f $Fmt $ImgFile d_${Disk}/u${Usr}/*.* ${Usr}:"
 		$Cmd = "cpmcp -f $Format $ImgFile d_${Disk}/u${Usr}/*.* ${Usr}:"
 		$Cmd
 		Invoke-Expression $Cmd
 	}
@ -54,7 +49,7 @@ if (Test-Path("d_${Disk}.txt"))
 		$Spec = $Line.Trim()
 		if (($Spec.Length -gt 0) -and ($Spec.Substring(0,1) -ne "#"))
 		{
 			$Cmd = "cpmcp -f $Fmt $ImgFile ${Spec}"
 			$Cmd = "cpmcp -f $Format $ImgFile ${Spec}"
 			$Cmd
 			Invoke-Expression $Cmd
 		}
@ -63,7 +58,6 @@ if (Test-Path("d_${Disk}.txt"))
 "Moving image $ImgFile into output directory..."
 #&$env:COMSPEC /c move $ImgFile ..\..\Binary\
 Move-Item $ImgFile -Destination "..\..\Binary\" -Force
 return
--- a/Source/Images/BuildHD.ps1
+++ b/Source/Images/BuildHD.ps1
@ -1,11 +1,21 @@
 #Param([Parameter(Mandatory)]$Disk, $SysFile="")
 Param($Disk, $SysFile="")
 Param($Disk, $Format="wbw_hd_new", $SysFile="")
 $ErrorAction = 'Stop'
 if ($Format -like "*_new")
 {
 	# New hard disk format!!!
 	$MediaID = 10
 	$Size = 8 * 1MB
 	$ImgFile = "hd_${Disk}.bin"
 }
 else
 {
 	# Legacy hard disk format
 	$MediaID = 4	
 	$Size = 8320KB	
 	$ImgFile = "hd_${Disk}.img"
 $Fmt = "wbw_hd0"
 $Size = (128KB * 65)
 }
 $CpmToolsPath = '../../Tools/cpmtools'
@ -13,35 +23,31 @@ $env:PATH = $CpmToolsPath + ';' + $env:PATH
 if (-not (Test-Path("d_${Disk}/")))
 {
 	"Source directory d_${Disk} for disk ${Disk} not found!"
 	Write-Error "Source directory d_${Disk} for disk ${Disk} not found!" -ErrorAction Stop 
 	return
 }
 "Generating Hard Disk ${Disk}..."
 #$Blank = ([string]([char]0xE5)) * $Size
 #Set-Content -Value $Blank -NoNewLine -Path $ImgFile
 $Blank = ([byte[]](0xE5) * $Size)
 [System.IO.File]::WriteAllBytes($ImgFile, $Blank)
 if ($SysFile.Length -gt 0) 
 {
 	"Adding System Image $SysFile..."
 	#$Sys = Get-Content -Path "$SysFile.sys" -Raw
 	#$Img = Get-Content -Path $ImgFile -Raw
 	#$NewImg = $Sys + $Img.SubString($Sys.Length, $Img.Length - $Sys.Length)
 	#Set-Content -NoNewLine -Path $ImgFile $NewImg
 	{ [byte[]]$SysImg = [System.IO.File]::ReadAllBytes($SysFile) }
 else 
 	{ [byte[]]$SysImg = @() }
 	$Cmd = "mkfs.cpm -f $Fmt -b $SysFile $ImgFile"
 	$Cmd
 	Invoke-Expression $Cmd
 }
 $Image = ($SysImg + ([byte[]](0xE5) * ($Size - $SysImg.length)))
 $Image[1410] = 0x4D
 $Image[1411] = 0x49
 $Image[1412] = 0x44
 $Image[1413] = $MediaID
 [System.IO.File]::WriteAllBytes($ImgFile, $Image)
 for ($Usr=0; $Usr -lt 16; $Usr++)
 {
 	if (Test-Path ("d_${Disk}/u${Usr}/*")) 
 	{
 		$Cmd = "cpmcp -f $Fmt $ImgFile d_${Disk}/u${Usr}/*.* ${Usr}:"
 		$Cmd = "cpmcp -f $Format $ImgFile d_${Disk}/u${Usr}/*.* ${Usr}:"
 		$Cmd
 		Invoke-Expression $Cmd
 	}
@ -54,7 +60,7 @@ if (Test-Path("d_${Disk}.txt"))
 		$Spec = $Line.Trim()
 		if (($Spec.Length -gt 0) -and ($Spec.Substring(0,1) -ne "#"))
 		{
 			$Cmd = "cpmcp -f $Fmt $ImgFile ${Spec}"
 			$Cmd = "cpmcp -f $Format $ImgFile ${Spec}"
 			$Cmd
 			Invoke-Expression $Cmd
 		}
@ -63,7 +69,6 @@ if (Test-Path("d_${Disk}.txt"))
 "Moving image $ImgFile into output directory..."
 #&$env:COMSPEC /c move $ImgFile ..\..\Binary\
 Move-Item $ImgFile -Destination "..\..\Binary\" -Force
 return
--- a/Source/Images/BuildNew.cmd
+++ b/Source/Images/BuildNew.cmd
@ -0,0 +1,40 @@
@echo off
 setlocal
 echo.
 echo Building Floppy Disk Images...
 echo.
 call BuildFD.cmd cpm22 wbw_fd144 ..\cpm22\cpm_wbw.sys
 call BuildFD.cmd zsdos wbw_fd144 ..\zsdos\zsys_wbw.sys
 call BuildFD.cmd nzcom wbw_fd144 ..\zsdos\zsys_wbw.sys
 call BuildFD.cmd cpm3 wbw_fd144 ..\cpm3\cpmldr.sys
 call BuildFD.cmd zpm3 wbw_fd144 ..\cpm3\cpmldr.sys
 call BuildFD.cmd ws4 wbw_fd144
 echo.
 echo Building Hard Disk Images...
 echo.
 call BuildHD.cmd cpm22 wbw_hd_new ..\cpm22\cpm_wbw.sys
 call BuildHD.cmd zsdos wbw_hd_new ..\zsdos\zsys_wbw.sys
 call BuildHD.cmd nzcom wbw_hd_new ..\zsdos\zsys_wbw.sys
 call BuildHD.cmd cpm3 wbw_hd_new ..\cpm3\cpmldr.sys
 call BuildHD.cmd zpm3 wbw_hd_new ..\cpm3\cpmldr.sys
 call BuildHD.cmd ws4 wbw_hd_new
 if exist ..\BPBIOS\bpbio-ww.rel call BuildHD.cmd bp wbw_hd_new
 copy hd_prefix.dat ..\..\Binary\
 echo.
 echo Build Hard Disk Images...
 copy /b hd_prefix.dat + ..\..\Binary\hd_cpm22.bin ..\..\Binary\hd_cpm22.img
 copy /b hd_prefix.dat + ..\..\Binary\hd_zsdos.bin ..\..\Binary\hd_zsdos.img
 copy /b hd_prefix.dat + ..\..\Binary\hd_nzcom.bin ..\..\Binary\hd_nzcom.img
 copy /b hd_prefix.dat + ..\..\Binary\hd_cpm3.bin ..\..\Binary\hd_cpm3.img
 copy /b hd_prefix.dat + ..\..\Binary\hd_zpm3.bin ..\..\Binary\hd_zpm3.img
 copy /b hd_prefix.dat + ..\..\Binary\hd_ws4.bin ..\..\Binary\hd_ws4.img
 if exist ..\..\Binary\hd_bp.bin copy /b hd_prefix.dat + ..\..\Binary\hd_bp.bin
 echo.
 echo Building Combo Disk Image...
 copy /b hd_prefix.dat + ..\..\Binary\hd_cpm22.bin + ..\..\Binary\hd_zsdos.bin + ..\..\Binary\hd_nzcom.bin + ..\..\Binary\hd_cpm3.bin + ..\..\Binary\hd_zpm3.bin + ..\..\Binary\hd_ws4.bin ..\..\Binary\hd_combo.img
--- a/Source/Images/Makefile
+++ b/Source/Images/Makefile
@ -5,12 +5,22 @@ SYSTEMS = ../CPM22/cpm_wbw.sys ../ZSDOS/zsys_wbw.sys ../CPM3/cpmldr.sys
 FDIMGS = fd_cpm22.img fd_zsdos.img fd_nzcom.img \
 	fd_cpm3.img fd_zpm3.img fd_ws4.img
 FDBIN = fd_cpm22.bin fd_zsdos.bin fd_nzcom.bin \
 	fd_cpm3.bin fd_zpm3.bin fd_ws4.bin
 HDIMGS = hd_cpm22.img hd_zsdos.img hd_nzcom.img \
 	hd_cpm3.img hd_zpm3.img hd_ws4.img
 HDBIN = hd_cpm22.bin hd_zsdos.bin hd_nzcom.bin \
 	hd_cpm3.bin hd_zpm3.bin hd_ws4.bin
 # HDIMGS += hd_bp.img
 # HDBIN += hd_bp.bin
 OBJECTS = $(FDIMGS) $(HDIMGS) hd_combo.img
 OTHERS = blank144 blankhd
 HDPREFIX = 			# Legacy
 #HDPREFIX = hd_prefix.dat	# New
 OBJECTS = $(FDIMGS) $(HDIMGS) hd_combo.img		# Legacy
 #OBJECTS = $(FDIMGS) $(HDIMGS) $(HDBIN) hd_combo.img	# New
 OTHERS = blank144 blankhd $(FDBIN) $(HDBIN)
 DEST=../../Binary
@ -19,8 +29,8 @@ include $(TOOLS)/Makefile.inc
 DIFFPATH = $(DIFFTO)/Binary
 hd_combo.img:	$(HDIMGS)
 	cat $(HDIMGS) > $@
 hd_combo.img:	$(HDPREFIX) $(HDBIN)
 	cat $^ > $@
 #
 # this somewhat impenetrable and fragile code is used to build each of the images
@ -30,17 +40,28 @@ hd_combo.img:	$(HDIMGS)
 # then process the d_{d}.txt file, copying in those files, and finally maybe put
 # an OS at the start of each image
 #
 FDSIZE := 1440
 blank144:
 	@echo Making Blank Floppy of size 1440k
 	@LANG=en_US.US-ASCII tr '\000' '\345' </dev/zero | dd of=$@ bs=1024 count=1440 2>/dev/null
 	@echo Making Blank Floppy of size $(FDSIZE)k
 	@LC_CTYPE=en_US.US-ASCII tr '\000' '\345' </dev/zero | dd of=$@ bs=1024 count=$(FDSIZE) 2>/dev/null
 HDSIZE := $(shell expr 128 '*' 65)
 HDSIZE := 8320		# Legacy
 #HDSIZE := 8192		# New
 blankhd:
 	@echo Making Blank Hd of size $(HDSIZE)k
 	@LANG=en_US.US-ASCII tr '\000' '\345' </dev/zero | dd of=$@ bs=1024 count=$(HDSIZE) 2>/dev/null
 	@LC_CTYPE=en_US.US-ASCII tr '\000' '\345' </dev/zero | dd of=$@ bs=1024 count=$(HDSIZE) 2>/dev/null
 %.img: %.bin
 	@if echo $@ | grep -q ^f ; then \
 		cat $< > $@ ; \
 	else \
 		cat $(HDPREFIX) $< > $@ ; \
 	fi ; \
 %.img: $(SYSTEMS) blank144 blankhd Makefile
 %.bin: $(SYSTEMS) blank144 blankhd Makefile
 	@sys= ; \
 	case $@ in \
 		(*cpm22*) sys=../CPM22/cpm_wbw.sys;; \
@ -49,8 +70,12 @@ blankhd:
 	esac ; \
 	if echo $@ | grep -q ^f ; then \
 		fmt=wbw_fd144 ; type=fd_ ; proto=blank144 ; \
 		mid="MID\006" ; \
 	else \
 		#fmt=wbw_hd_new ; type=hd_ ; proto=blankhd ; \
 		#mid="MID\012" ; \
 		fmt=wbw_hd0 ; type=hd_ ; proto=blankhd ; \
 		mid="MID\004" ; \
 	fi ; \
 	d=$$(echo $(basename $@) | sed s/$$type//) ; \
 	echo Generating $@ ; \
@ -59,6 +84,7 @@ blankhd:
 		echo copying system $$sys to $@ ; \
 		$(BINDIR)/mkfs.cpm -f $$fmt -b $$sys $@ ; \
 	fi ; \
 	LC_CTYPE=en_US.US-ASCII echo $$mid | dd bs=1 count=4 seek=1410 conv=notrunc of=$@ ; \
 	for u in $$(seq 0 15) ; do \
 		dir=d_$$d/u$$u ; \
 		if [ -d $$dir ] ; then \
@ -93,7 +119,7 @@ imgdiff:
 		if echo $$i | grep -q ^f ; then \
 			fmt=wbw_fd144 ; \
 		else \
 			fmt=wbw_hd0 ; \
 			fmt=wbw_hd0_1024 ; \
 		fi ; \
 		$(BINDIR)/cpmls -i -f $$fmt $$i > $$i.ls ; \
 		$(BINDIR)/cpmls -i -f $$fmt $(DIFFPATH)/$$i > $$i.diff.ls ; \
--- a/Source/Images/diskdefs
+++ b/Source/Images/diskdefs
@ -297,121 +297,158 @@ diskdef wbw_rom1024
  os 2.2
 end
 # UNA 512KB ROM (128KB reserved, 384KB ROM Disk)
 # RomWBW 720K floppy media
 diskdef wbw_fd720
  seclen 512
  tracks 160
  sectrk 9
  blocksize 2048
  maxdir 128
  skew 0
  boottrk 4
  os 2.2
 end
 diskdef una_rom512
 # RomWBW 1.44M floppy media
 diskdef wbw_fd144
  seclen 512
  tracks 12
  sectrk 64
  tracks 160
  sectrk 18
  blocksize 2048
  maxdir 256
  skew 0
  boottrk 0
  boottrk 2
  os 2.2
 end
 # UNA 512KB ROM (128KB reserved, 896KB ROM Disk)
 # RomWBW 360K floppy media
 diskdef wbw_fd360
  seclen 512
  tracks 80
  sectrk 9
  blocksize 2048
  maxdir 128
  skew 0
  boottrk 4
  os 2.2
 end
 diskdef una_rom1024
 # RomWBW 1.20M floppy media
 diskdef wbw_fd120
  seclen 512
  tracks 28
  sectrk 64
  tracks 160
  sectrk 15
  blocksize 2048
  maxdir 256
  skew 0
  boottrk 0
  boottrk 2
  os 2.2
 end
 # RomWBW 8MB Hard Disk, LU 0-3
 # RomWBW 8MB Hard Disk, first 4 slices
 # Legacy format, 512 dir entries, 8,320 sectors / slice
 diskdef wbw_hd0
  seclen 512
  tracks 65
  sectrk 256
  tracks 1040
  sectrk 16
  blocksize 4096
  maxdir 512
  skew 0
  boottrk 1
  boottrk 16
  os 2.2
 end
 diskdef wbw_hd1
  seclen 512
  tracks 130
  sectrk 256
  tracks 2080
  sectrk 16
  blocksize 4096
  maxdir 512
  skew 0
  boottrk 66
  boottrk 1056
  os 2.2
 end
 diskdef wbw_hd2
  seclen 512
  tracks 195
  sectrk 256
  tracks 3120
  sectrk 16
  blocksize 4096
  maxdir 512
  skew 0
  boottrk 131
  boottrk 2096
  os 2.2
 end
 diskdef wbw_hd3
  seclen 512
  tracks 260
  sectrk 256
  tracks 4160
  sectrk 16
  blocksize 4096
  maxdir 512
  skew 0
  boottrk 196
  boottrk 3136
  os 2.2
 end
 # RomWBW 720K floppy media
 diskdef wbw_fd720
 # RomWBW 8MB Hard Disk
 # New format, 1024 dir entries, 8,192 sectors / slice
 # Pure filesystem image, no prefix
 diskdef wbw_hd_new
  seclen 512
  tracks 160
  sectrk 9
  blocksize 2048
  maxdir 128
  tracks 1024
  sectrk 16
  blocksize 4096
  maxdir 1024
  skew 0
  boottrk 4
  boottrk 2
  os 2.2
 end
 # RomWBW 1.44M floppy media
 diskdef wbw_fd144
 # RomWBW 8MB Hard Disk, first 4 slices
 # New format, 1024 dir entries, 8,192 sectors / slice
 # Assumes 256 sector (16 track) hard disk prefix
 diskdef wbw_hd0_new
  seclen 512
  tracks 160
  sectrk 18
  blocksize 2048
  maxdir 256
  tracks 1040
  sectrk 16
  blocksize 4096
  maxdir 1024
  skew 0
  boottrk 2
  boottrk 18
  os 2.2
 end
 # RomWBW 360K floppy media
 diskdef wbw_fd360
 diskdef wbw_hd1_new
  seclen 512
  tracks 80
  sectrk 9
  blocksize 2048
  maxdir 128
  tracks 2064
  sectrk 16
  blocksize 4096
  maxdir 1024
  skew 0
  boottrk 4
  boottrk 1042
  os 2.2
 end
 # RomWBW 1.20M floppy media
 diskdef wbw_fd120
 diskdef wbw_hd2_new
  seclen 512
  tracks 160
  sectrk 15
  blocksize 2048
  maxdir 256
  tracks 3112
  sectrk 16
  blocksize 4096
  maxdir 1024
  skew 0
  boottrk 2
  boottrk 2066
  os 2.2
 end
 diskdef wbw_hd3_new
  seclen 512
  tracks 4136
  sectrk 16
  blocksize 4096
  maxdir 1024
  skew 0
  boottrk 3114
  os 2.2
 end
--- a/Source/Images/hd_prefix.dat
+++ b/Source/Images/hd_prefix.dat
--- a/Source/ver.inc
+++ b/Source/ver.inc
@ -1,5 +1,5 @@
 #DEFINE	RMJ	3
 #DEFINE	RMN	1
 #DEFINE	RUP	0
 #DEFINE	RUP	1
 #DEFINE	RTP	0
 #DEFINE BIOSVER	"3.1-pre.16"
 #DEFINE BIOSVER	"3.1.1-pre.0"
--- a/Source/ver.lib
+++ b/Source/ver.lib
@ -1,7 +1,7 @@
 rmj	equ	3
 rmn	equ	1
 rup	equ	0
 rup	equ	1
 rtp	equ	0
 biosver	macro
 	db	"3.1-pre.16"
 	db	"3.1.1-pre.0"
 	endm
--- a/Tools/cpmtools/diskdefs
+++ b/Tools/cpmtools/diskdefs
@ -297,121 +297,158 @@ diskdef wbw_rom1024
  os 2.2
 end
 # UNA 512KB ROM (128KB reserved, 384KB ROM Disk)
 # RomWBW 720K floppy media
 diskdef wbw_fd720
  seclen 512
  tracks 160
  sectrk 9
  blocksize 2048
  maxdir 128
  skew 0
  boottrk 4
  os 2.2
 end
 diskdef una_rom512
 # RomWBW 1.44M floppy media
 diskdef wbw_fd144
  seclen 512
  tracks 12
  sectrk 64
  tracks 160
  sectrk 18
  blocksize 2048
  maxdir 256
  skew 0
  boottrk 0
  boottrk 2
  os 2.2
 end
 # UNA 512KB ROM (128KB reserved, 896KB ROM Disk)
 # RomWBW 360K floppy media
 diskdef wbw_fd360
  seclen 512
  tracks 80
  sectrk 9
  blocksize 2048
  maxdir 128
  skew 0
  boottrk 4
  os 2.2
 end
 diskdef una_rom1024
 # RomWBW 1.20M floppy media
 diskdef wbw_fd120
  seclen 512
  tracks 28
  sectrk 64
  tracks 160
  sectrk 15
  blocksize 2048
  maxdir 256
  skew 0
  boottrk 0
  boottrk 2
  os 2.2
 end
 # RomWBW 8MB Hard Disk, LU 0-3
 # RomWBW 8MB Hard Disk, first 4 slices
 # Legacy format, 512 dir entries, 8,320 sectors / slice
 diskdef wbw_hd0
  seclen 512
  tracks 65
  sectrk 256
  tracks 1040
  sectrk 16
  blocksize 4096
  maxdir 512
  skew 0
  boottrk 1
  boottrk 16
  os 2.2
 end
 diskdef wbw_hd1
  seclen 512
  tracks 130
  sectrk 256
  tracks 2080
  sectrk 16
  blocksize 4096
  maxdir 512
  skew 0
  boottrk 66
  boottrk 1056
  os 2.2
 end
 diskdef wbw_hd2
  seclen 512
  tracks 195
  sectrk 256
  tracks 3120
  sectrk 16
  blocksize 4096
  maxdir 512
  skew 0
  boottrk 131
  boottrk 2096
  os 2.2
 end
 diskdef wbw_hd3
  seclen 512
  tracks 260
  sectrk 256
  tracks 4160
  sectrk 16
  blocksize 4096
  maxdir 512
  skew 0
  boottrk 196
  boottrk 3136
  os 2.2
 end
 # RomWBW 720K floppy media
 diskdef wbw_fd720
 # RomWBW 8MB Hard Disk
 # New format, 1024 dir entries, 8,192 sectors / slice
 # Pure filesystem image, no prefix
 diskdef wbw_hd_new
  seclen 512
  tracks 160
  sectrk 9
  blocksize 2048
  maxdir 128
  tracks 1024
  sectrk 16
  blocksize 4096
  maxdir 1024
  skew 0
  boottrk 4
  boottrk 2
  os 2.2
 end
 # RomWBW 1.44M floppy media
 diskdef wbw_fd144
 # RomWBW 8MB Hard Disk, first 4 slices
 # New format, 1024 dir entries, 8,192 sectors / slice
 # Assumes 256 sector (16 track) hard disk prefix
 diskdef wbw_hd0_new
  seclen 512
  tracks 160
  sectrk 18
  blocksize 2048
  maxdir 256
  tracks 1040
  sectrk 16
  blocksize 4096
  maxdir 1024
  skew 0
  boottrk 2
  boottrk 18
  os 2.2
 end
 # RomWBW 360K floppy media
 diskdef wbw_fd360
 diskdef wbw_hd1_new
  seclen 512
  tracks 80
  sectrk 9
  blocksize 2048
  maxdir 128
  tracks 2064
  sectrk 16
  blocksize 4096
  maxdir 1024
  skew 0
  boottrk 4
  boottrk 1042
  os 2.2
 end
 # RomWBW 1.20M floppy media
 diskdef wbw_fd120
 diskdef wbw_hd2_new
  seclen 512
  tracks 160
  sectrk 15
  blocksize 2048
  maxdir 256
  tracks 3112
  sectrk 16
  blocksize 4096
  maxdir 1024
  skew 0
  boottrk 2
  boottrk 2066
  os 2.2
 end
 diskdef wbw_hd3_new
  seclen 512
  tracks 4136
  sectrk 16
  blocksize 4096
  maxdir 1024
  skew 0
  boottrk 3114
  os 2.2
 end