Miscellaneous

- Improve handling of RTC latch shadow - Hardware auto-detect on DSKY and DSKYNG - Regen documentation
4 years ago · 4f941de39c
20 changed files with 265 additions and 100 deletions
--- a/Applications.pdf
+++ b/Applications.pdf
--- a/Architecture.pdf
+++ b/Architecture.pdf
--- a/Catalog.pdf
+++ b/Catalog.pdf
--- a/Started.pdf
+++ b/Started.pdf
--- a/ReadMe.md
+++ b/ReadMe.md
@ -3,7 +3,7 @@
 ## Z80/Z180 System Software

 Version 3.1 Pre-release  
-Thursday 22 July 2021
+Thursday 26 August 2021

 Wayne Warthen <wwarthen@gmail.com>

@ -597,9 +597,9 @@ well as real spinning hard disks.
 | fd\_cpm22.img | hd\_cpm22.img | DRI CP/M 2.2 boot disk       |
 | fd\_zsdos.img | hd\_zsdos.img | ZSDOS 1.1 boot disk          |
 | fd\_nzcom.img | hd\_nzcom.img | NZCOM boot disk              |
-| fd\_cpm3      | hd\_cpm3.img  | DRI CP/M 3 boot disk         |
-| fd\_zpm3      | hd\_zpm3.img  | ZPM3 boot disk               |
-| fd\_ws4       | hd\_ws4.img   | WordStar v4 application disk |
+| fd\_cpm3.img  | hd\_cpm3.img  | DRI CP/M 3 boot disk         |
+| fd\_zpm3.img  | hd\_zpm3.img  | ZPM3 boot disk               |
+| fd\_ws4.img   | hd\_ws4.img   | WordStar v4 application disk |

 In addition to the disk images above, there is also a special hard disk
 image called hd\_combo.img. This image contains all of the images above,
@ -1029,6 +1029,8 @@ through the normal startup process just like it was started from ROM.
 However, your ROM has not been updated and the next time you boot your
 system, it will revert to the system image contained in ROM.

+# Upgrading via Flash Utility
+
 If you do not have easy access to a ROM programmer, it is usually
 possible to reprogram your system ROM using the FLASH utility from Will
 Sowerbutts. This application, called FLASH.COM, can be found on the ROM
@ -1069,6 +1071,21 @@ To confirm your ROM chip has been successfully updated, restart your
 system and boot an operating system from ROM. Do not boot from a disk
 device yet. Review the boot messages to see if any issues have occurred.

+# Upgrading via XModem Flash Updater
+
+Similar to using the Flash utility, the system ROM can be updated or
+upgraded through the ROM based updater utility. This works by by
+reprogrammed the flash ROM as the file is being transfered.
+
+This has the advantage that secondary storage is not required to hold
+the new image.
+
+From the Boot Loader menu select X (Xmodem Flash Updater) and then U
+(Begin Update). Then initiate the Xmodem transfer of the .img or .upd
+file.
+
+# Post Update System Image and Application update process
+
 Once you are satisfied that the ROM is working well, you will need to
 update the system images and RomWBW custom applications on your disk
 drives. The system images and custom applications are matched to the
--- a/ReadMe.txt
+++ b/ReadMe.txt
@ -3,7 +3,7 @@ RomWBW
 Z80/Z180 System Software

 Version 3.1 Pre-release
-Thursday 22 July 2021
+Thursday 26 August 2021

 Wayne Warthen wwarthen@gmail.com

@ -629,9 +629,9 @@ well as real spinning hard disks.
  fd_cpm22.img   hd_cpm22.img   DRI CP/M 2.2 boot disk
  fd_zsdos.img   hd_zsdos.img   ZSDOS 1.1 boot disk
  fd_nzcom.img   hd_nzcom.img   NZCOM boot disk
-  fd_cpm3        hd_cpm3.img    DRI CP/M 3 boot disk
-  fd_zpm3        hd_zpm3.img    ZPM3 boot disk
-  fd_ws4         hd_ws4.img     WordStar v4 application disk
+  fd_cpm3.img    hd_cpm3.img    DRI CP/M 3 boot disk
+  fd_zpm3.img    hd_zpm3.img    ZPM3 boot disk
+  fd_ws4.img     hd_ws4.img     WordStar v4 application disk

 In addition to the disk images above, there is also a special hard disk
 image called hd_combo.img. This image contains all of the images above,
@ -1053,6 +1053,8 @@ through the normal startup process just like it was started from ROM.
 However, your ROM has not been updated and the next time you boot your
 system, it will revert to the system image contained in ROM.

+Upgrading via Flash Utility
+
 If you do not have easy access to a ROM programmer, it is usually
 possible to reprogram your system ROM using the FLASH utility from Will
 Sowerbutts. This application, called FLASH.COM, can be found on the ROM
@ -1093,6 +1095,21 @@ To confirm your ROM chip has been successfully updated, restart your
 system and boot an operating system from ROM. Do not boot from a disk
 device yet. Review the boot messages to see if any issues have occurred.

+Upgrading via XModem Flash Updater
+
+Similar to using the Flash utility, the system ROM can be updated or
+upgraded through the ROM based updater utility. This works by by
+reprogrammed the flash ROM as the file is being transfered.
+
+This has the advantage that secondary storage is not required to hold
+the new image.
+
+From the Boot Loader menu select X (Xmodem Flash Updater) and then U
+(Begin Update). Then initiate the Xmodem transfer of the .img or .upd
+file.
+
+Post Update System Image and Application update process
+
 Once you are satisfied that the ROM is working well, you will need to
 update the system images and RomWBW custom applications on your disk
 drives. The system images and custom applications are matched to the
--- a/Source/HBIOS/dma.asm
+++ b/Source/HBIOS/dma.asm
@ -41,7 +41,7 @@ DMA_INIT:
 	xor	a
 	out	(DMABASE+1),a		; force ready off
 ;
-	ld	a,(RTCVAL)
+	ld	a,(HB_RTCVAL)
 	or	%00001000		; half
 	out	(RTCIO),a		; clock
 ;
@ -59,7 +59,7 @@ DMA_INIT:
 ;
 DMA_EXIT:
 	push	af
-	ld	a,(RTCVAL)
+	ld	a,(HB_RTCVAL)
 	and	%11110111		; full
 	out	(RTCIO),a		; clock
 	pop	af
@ -151,7 +151,7 @@ DMALDIR:
 	ld	b,DMACopy_Len		; dma command
 	ld	c,DMABASE		; block
 ;
-	ld	a,(RTCVAL)
+	ld	a,(HB_RTCVAL)
 	or	%00001000		; half
 	out	(RTCIO),a		; clock
 	di
@ -165,7 +165,7 @@ DMALDIR:
 	sub	%00011011

 	push	af
-	ld	a,(RTCVAL)
+	ld	a,(HB_RTCVAL)
 	and	%11110111		; full
 	out	(RTCIO),a		; clock
 	pop	af
@ -201,7 +201,7 @@ DMAOTIR:
 	ld	b,DMAOut_Len		; dma command
 	ld	c,DMABASE		; block
 ;
-	ld	a,(RTCVAL)
+	ld	a,(HB_RTCVAL)
 	or	%00001000		; half
 	out	(RTCIO),a		; clock
 	di
@ -215,7 +215,7 @@ DMAOTIR:
 	sub	%00011011
 ;
 	push	af
-	ld	a,(RTCVAL)
+	ld	a,(HB_RTCVAL)
 	and	%11110111		; full
 	out	(RTCIO),a		; clock
 	pop	af
@ -256,7 +256,7 @@ DMAINIR:
 	ld	b,DMAIn_Len		; dma command
 	ld	c,DMABASE		; block
 ;
-	ld	a,(RTCVAL)
+	ld	a,(HB_RTCVAL)
 	or	%00001000		; half
 	out	(RTCIO),a		; clock
 	di
@ -270,7 +270,7 @@ DMAINIR:
 	sub	%00011011
 ;
 	push	af
-	ld	a,(RTCVAL)
+	ld	a,(HB_RTCVAL)
 	and	%11110111		; full
 	out	(RTCIO),a		; clock
 	pop	af
--- a/Source/HBIOS/dsky.asm
+++ b/Source/HBIOS/dsky.asm
@ -37,11 +37,11 @@ PPIX	 	.EQU 	DSKYPPIBASE + 3	; PPI CONTROL PORT
 ;  CONFIGURE PARALLEL PORT AND CLEAR KEYPAD BUFFER
 ;____________________________________________________________________________________________________
 ;
-DSKY_INIT:
+DSKY_PREINIT:
 	OR	$FF			; SIGNAL TO WAIT FOR KEY RELEASE
 	LD	(DSKY_KEYBUF),A		; SET IT
-	
-	; PPI PORT B IS NORMALLY SET TO INPUT, BUT DURING HERE WE
+;
+	; PPI PORT B IS NORMALLY SET TO INPUT, BUT HERE WE
 	; TEMPORARILY SET IT TO OUTPUT.  WHILE IN OUTPUT MODE, WE
 	; WRITE A VALUE OF $FF WHICH WILL BE PERSISTED BY THE PPI
 	; CHIP BUS HOLD CIRCUIT IF THERE IS NO DSKY PRESENT.  SO,
@ -53,22 +53,47 @@ DSKY_INIT:
 	OUT	(PPIX),A
 	LD	A,$FF			; SET PPIB=$FF, BUS HOLD
 	OUT	(PPIB),A
-	
+;
 	LD	A,$82			; PA OUT, PB IN, PC OUT
 	OUT 	(PPIX),A
-
+;
 	;IN	A,(PPIB)		; *DEBUG*
 	;CALL	PRTHEXBYTE		; *DEBUG*
-	
+;
+	IN	A,(PPIB)		; READ PPIB
+	XOR	$FF			; INVERT RESULT
+	LD	(DSKY_PRESENT),A	; SAVE AS PRESENT FLAG
+;
 DSKY_RESET:
 	PUSH	AF
-
+;
 	LD	A,$70			; PPISD AND 7218 INACTIVE
 	OUT	(PPIC),A
-	
+;
 	POP	AF
 	RET
 ;
+#IFNDEF ROMLDR
+;
+DSKY_INIT:
+	CALL	NEWLINE			; FORMATTING
+	PRTS("DSKY:$")			; FORMATTING
+;
+	PRTS(" IO=0x$")			; FORMATTING
+	LD	A,DSKYPPIBASE		; GET BASE PORT
+	CALL	PRTHEXBYTE		; PRINT BASE PORT
+	PRTS(" MODE=$")			; FORMATTING
+	PRTS("V1$")			; PRINT DSKY TYPE
+;
+	LD	A,(DSKY_PRESENT)	; PRESENT?
+	OR	A			; SET FLAGS
+	RET	NZ			; YES, ALL DONE
+	PRTS(" NOT PRESENT$")		; NOT PRESENT
+;
+	RET
+;
+#ENDIF
+;
 #IFDEF DSKY_KBD
 ;
 KY_0	.EQU	$00
@ -102,6 +127,10 @@ KY_BO	.EQU	$17	; BOOT
 ;____________________________________________________________________________________________________
 ;
 DSKY_GETKEY:
+	LD	A,(DSKY_PRESENT)	; DOES IT EXIST?
+	OR	A			; SET FLAGS
+	JR	Z,DSKY_GETKEY1A		; ABORT IF NOT PRESENT
+;
 	CALL	DSKY_STAT		; CHECK STATUS
 	JR	Z,DSKY_GETKEY		; LOOP IF NOTHING READY
 	LD	A,(DSKY_KEYBUF)
@ -114,6 +143,7 @@ DSKY_GETKEY1:
 	INC	HL
 	INC	C			; BUMP INDEX
 	DJNZ	DSKY_GETKEY1		; LOOP UNTIL EOT
+DSKY_GETKEY1A:
 	LD	A,$FF			; NOT FOUND ERR, RETURN $FF
 	RET
 DSKY_GETKEY2:
@ -129,6 +159,10 @@ DSKY_GETKEY2:
 ;____________________________________________________________________________________________________
 ;
 DSKY_STAT:
+	LD	A,(DSKY_PRESENT)	; DOES IT EXIST?
+	OR	A			; SET FLAGS
+	RET	Z			; ABORT WITH A=0 IF NOT THERE
+;
 	LD	A,(DSKY_KEYBUF)		; GET CURRENT BUF VAL
 	CP	$FF			; $FF MEANS WE ARE WAITING FOR PREV KEY TO BE RELEASED
 	JR	Z,DSKY_STAT1		; CHECK FOR PREV KEY RELEASE
@ -197,7 +231,7 @@ DSKY_SCAN1:
 	INC	E			; BUMP COL ID
 	DJNZ	DSKY_SCAN1		; LOOP THROUGH ALL COLS
 	XOR	A			; NOTHING FOUND, RETURN ZERO
-	JR	DSKY_RESET		; RETURN VIA RESET
+	JP	DSKY_RESET		; RETURN VIA RESET
 DSKY_SCAN2:
 	RRC	E			; MOVE COL ID
 	RRC	E			; ... TO HIGH BITS 6 & 7
@ -344,6 +378,8 @@ DSKY_HEXMAP:
 ;
 ; SEG DISPLAY WORKING STORAGE
 ;
+DSKY_PRESENT	.DB	0
+;
 DSKY_BUF	.FILL	8,0
 DSKY_BUFLEN	.EQU	$ - DSKY_BUF
 DSKY_HEXBUF	.FILL	4,0
--- a/Source/HBIOS/dskyng.asm
+++ b/Source/HBIOS/dskyng.asm
@ -66,7 +66,7 @@ DSKY_CMD_FIFO:	.EQU	%01000000	; READ FIFO
 ;
 DSKY_PRESCL:	.EQU	DSKYOSC/100000	; PRESCALER
 ;
-;__DSKY_INIT_________________________________________________________________________________________
+;__DSKY_PREINIT______________________________________________________________________________________
 ;
 ;  CONFIGURE PARALLEL PORT AND INITIALIZE 8279
 ;____________________________________________________________________________________________________
@ -74,9 +74,11 @@ DSKY_PRESCL:	.EQU	DSKYOSC/100000	; PRESCALER
 ;
 ; HARDWARE RESET 8279 BY PULSING RESET LINE
 ;
-DSKY_INIT:
-;
-	; SETUP PPI
+DSKY_PREINIT:
+	; CHECK FOR PPI
+	CALL	DSKY_PPIDETECT		; TEST FOR PPI HARDWARE
+	RET	NZ			; BAIL OUT IF NOT THERE
+	; SETUP PPI TO DEFAULT MODE
 	CALL	DSKY_PPIRD
 	; INIT 8279 VALUES TO IDLE STATE
 	LD	A,DSKY_PPI_IDLE
@ -86,7 +88,25 @@ DSKY_INIT:
 	OUT	(PPIC),A
 	RES	7,A
 	OUT	(PPIC),A
-	; DONE
+	; INITIALIZE 8279
+	CALL	DSKY_REINIT
+	; NOW SEE IF A DSKYNG IS REALLY THERE...
+	LD	A,$A5
+	LD	(DSKY_BUF),A
+	LD	HL,DSKY_BUF
+	LD	C,0
+	LD	B,1
+	CALL	DSKY_PUTSTR
+	LD	HL,DSKY_BUF
+	LD	C,0
+	LD	B,1
+	CALL	DSKY_GETSTR
+	LD	A,(DSKY_BUF)
+	CP	$A5
+	RET	NZ			; BAIL OUT IF MISCOMPARE
+	LD	A,$FF
+	LD	(DSKY_PRESENT),A
+	RET
 ;
 DSKY_REINIT:
 	CALL	DSKY_PPIIDLE
@ -116,6 +136,53 @@ DSKY_RESET1:
 DSKY_RESET2:
 	RET
 ;
+;__DSKY_INIT_________________________________________________________________________________________
+;
+;  DISPLAY DSKY INFO
+;____________________________________________________________________________________________________
+;
+#IFNDEF ROMLDR
+;
+DSKY_INIT:
+	CALL	NEWLINE			; FORMATTING
+	PRTS("DSKY:$")			; FORMATTING
+;
+	PRTS(" IO=0x$")			; FORMATTING
+	LD	A,DSKYPPIBASE		; GET BASE PORT
+	CALL	PRTHEXBYTE		; PRINT BASE PORT
+	PRTS(" MODE=$")			; FORMATTING
+	PRTS("NG$")			; PRINT DSKY TYPE
+;
+	LD	A,(DSKY_PRESENT)	; PRESENT?
+	OR	A			; SET FLAGS
+	RET	NZ			; YES, ALL DONE
+	PRTS(" NOT PRESENT$")		; NOT PRESENT
+	RET				; DONE
+;
+#ENDIF
+;
+;__DSKY_PPIDETECT____________________________________________________________________________________
+;
+;  PROBE FOR PPI HARDWARE
+;____________________________________________________________________________________________________
+;
+DSKY_PPIDETECT:
+;
+	; TEST FOR PPI EXISTENCE
+	; WE SETUP THE PPI TO WRITE, THEN WRITE A VALUE OF ZERO
+	; TO PORT A (DATALO), THEN READ IT BACK.  IF THE PPI IS THERE
+	; THEN THE BUS HOLD CIRCUITRY WILL READ BACK THE ZERO. SINCE
+	; WE ARE IN WRITE MODE, AN IDE CONTROLLER WILL NOT BE ABLE TO
+	; INTERFERE WITH THE VALUE BEING READ.
+	CALL	DSKY_PPIWR
+;
+	LD	C,PPIA			; PPI PORT A
+	XOR	A			; VALUE ZERO
+	OUT	(C),A			; PUSH VALUE TO PORT
+	IN	A,(C)			; GET PORT VALUE
+	OR	A			; SET FLAGS
+	RET				; AND RETURN
+;
 #IFDEF DSKY_KBD
 ;
 KY_0	.EQU	$00
@ -153,6 +220,9 @@ KY_F1	.EQU	$21	; F1
 ;____________________________________________________________________________________________________
 ;
 DSKY_STAT:
+	LD	A,(DSKY_PRESENT)	; DOES IT EXIST?
+	OR	A			; SET FLAGS
+	RET	Z			; ABORT WITH A=0 IF NOT THERE
 	CALL	DSKY_ST
 	AND	$0F			; ISOLATE THE CUR FIFO LEN
 	RET
@ -163,6 +233,9 @@ DSKY_STAT:
 ;____________________________________________________________________________________________________
 ;
 DSKY_GETKEY:
+	LD	A,(DSKY_PRESENT)	; DOES IT EXIST?
+	OR	A			; SET FLAGS
+	JR	Z,DSKY_GETKEY1A		; ABORT IF NOT PRESENT
 	CALL	DSKY_STAT
 	JR	Z,DSKY_GETKEY		; LOOP IF NOTHING THERE
 	LD	A,DSKY_CMD_FIFO
@ -181,6 +254,7 @@ DSKY_GETKEY1:
 	INC	C			; BUMP INDEX
 	DJNZ	DSKY_GETKEY1		; LOOP UNTIL EOT
 	POP	AF			; FIX STACK
+DSKY_GETKEY1A:
 	LD	A,$FF			; NOT FOUND ERR, RETURN $FF
 	RET
 DSKY_GETKEY2:
@ -690,6 +764,7 @@ DSKY_HEXMAP:
 	.DB	$71	; F
 ;
 DSKY_PPIX_VAL:	.DB	0
+DSKY_PRESENT:	.DB	0
 ;
 ; SEG DISPLAY WORKING STORAGE
 ;
--- a/Source/HBIOS/dsrtc.asm
+++ b/Source/HBIOS/dsrtc.asm
@ -97,7 +97,7 @@ DSRTC_IDLE	.EQU	%00100000	; QUIESCENT STATE
 ;
 RTCDEF		.SET	RTCDEF | DSRTC_IDLE	; FOR HBIOS MAINLINE
 ;
-#DEFINE	DSRTC_OPRVAL	RTCVAL
+#DEFINE	DSRTC_OPRVAL	HB_RTCVAL
 ;
 ; VALUES FOR DIFFERENT BATTERY OR SUPERCAPACITOR CHARGE RATES
 ;
--- a/Source/HBIOS/hbios.asm
+++ b/Source/HBIOS/hbios.asm
@ -105,10 +105,10 @@ MODCNT	.SET	MODCNT + 1
  #ENDIF
  #IF (LEDMODE == LEDMODE_RTC)
 #DEFINE LED(N)	PUSH	AF
-  #DEFCONT \	LD	A,(RTCVAL)
+  #DEFCONT \	LD	A,(HB_RTCVAL)
  #DEFCONT \	AND	%11111100
  #DEFCONT \	OR	(N & %00000011)
-  #DEFCONT \	LD	(RTCVAL),A
+  #DEFCONT \	LD	(HB_RTCVAL),A
  #DEFCONT \	OUT	(LEDPORT),A
  #DEFCONT \	POP	AF
  #ENDIF
@ -948,7 +948,8 @@ HBX_BUF_END	.EQU	$
 	.DW	0			; HB_DSTADR: BNKCPY DESTINATION ADDRESS
 	.DB	BID_USR			; HB_DSTBNK: BNKCPY DESTINATION BANK ID
 	.DW	0			; HB_CPYLEN: BNKCPY LENGTH
-	.FILL	5,0			; FILLER, RESERVED FOR FUTURE HBIOS USE
+	.FILL	4,0			; FILLER, RESERVED FOR FUTURE HBIOS USE
+	.DB	RTCDEF			; SHADOW VALUE FOR RTC LATCH PORT
 	.DB	$FE			; HB_LOCK: HBIOS MUTEX LOCK
 	JP	HBX_INVOKE		; HB_INVOKE: FIXED ADR ENTRY FOR HBX_INVOKE (ALT FOR RST 08)
 	JP	HBX_BNKSEL		; HB_BNKSEL: FIXED ADR ENTRY FOR HBX_BNKSEL
@ -1080,7 +1081,7 @@ Z280_BOOTERR	.TEXT	"\r\n\r\n*** Application mode boot not supported under Z280 n
  #ENDIF
  #IF (LEDMODE == LEDMODE_RTC)
 	LD	A,%00000001		; LED 0
-	LD	(RTCVAL),A		; SAVE TO SHADOW REGISTER
+	LD	(HB_RTCVAL),A		; SAVE TO SHADOW REGISTER
  #ENDIF
 	OUT	(LEDPORT),A
 #ENDIF
@ -1440,24 +1441,6 @@ SAVE_REC_M:
 ;
 	DIAG(%00001111)
 ;
-#IF (DSKYENABLE)
-	CALL	DSKY_INIT
-
-	LD	HL,MSG_HBVER +  5
-	LD	A,(DSKY_HEXMAP + RMJ)
-	OR	$80
-	LD	(HL),A
-	INC	HL
-	LD	A,(DSKY_HEXMAP + RMN)
-	OR	$80
-	LD	(HL),A
-	INC	HL
-	LD	A,(DSKY_HEXMAP + RUP)
-	LD	(HL),A
-	LD	HL,MSG_HBVER
-	CALL	DSKY_SHOW
-#ENDIF
-;
 #IF (WBWDEBUG == USEMIO)		; BUFFER OUTPUT UNTIL
 	CALL	MIO_INIT		; WE GET TO BOOT MESSAGE
 #ENDIF
@ -1793,6 +1776,24 @@ NOT_REC_M0:
 #ENDIF
 	CALL	CALLLIST							; PROCESS THE PRE-INIT CALL TABLE
 ;
+#IF (DSKYENABLE)
+	;CALL	DSKY_PREINIT
+
+	LD	HL,MSG_HBVER +  5
+	LD	A,(DSKY_HEXMAP + RMJ)
+	OR	$80
+	LD	(HL),A
+	INC	HL
+	LD	A,(DSKY_HEXMAP + RMN)
+	OR	$80
+	LD	(HL),A
+	INC	HL
+	LD	A,(DSKY_HEXMAP + RUP)
+	LD	(HL),A
+	LD	HL,MSG_HBVER
+	CALL	DSKY_SHOW
+#ENDIF
+;
 #IF FALSE
 ;
 ; TEST DEBUG ***************************************************************************************
@ -2242,6 +2243,14 @@ HB_WDZ:
 	PRTX(STR_BANNER)
 #ENDIF
 ;
+; EXPERIMENTAL!!!
+; ENGAGE TURBO...
+;
+;	LD	A,(HB_RTCVAL)
+;	SET	3,A
+;	OUT	(RTCIO),A
+;	LD	(HB_RTCVAL),A
+;
 INITSYS3:
 	CALL	PRTSUM			; PRINT UNIT/DEVICE SUMMARY TABLE
 ;
@ -2350,6 +2359,9 @@ HB_INITRLEN	.EQU	(($ - HB_INIT_REC) / 2)
 ;==================================================================================================
 ;
 HB_PCINITTBL:
+#IF (DSKYENABLE)
+	.DW	DSKY_PREINIT
+#ENDIF
 #IF (ASCIENABLE)
 	.DW	ASCI_PREINIT
 #ENDIF
@ -2390,6 +2402,9 @@ HB_INITTBL:
 #IF (CTCENABLE)
 	.DW	CTC_INIT
 #ENDIF
+#IF (DSKYENABLE)
+	.DW	DSKY_INIT
+#ENDIF
 #IF (AY38910ENABLE)
 	.DW	AY38910_INIT		; AUDIBLE INDICATOR OF BOOT START
 #ENDIF
@ -6116,7 +6131,7 @@ HB_SECS		.FILL	4,0		; 32 BIT SECONDS COUNTER
 ;
 HB_CPUTYPE	.DB	0		; 0=Z80, 1=80180, 2=SL1960, 3=ASCI BRG
 ;
-RTCVAL		.DB	RTCDEF		; SHADOW VALUE FOR RTC LATCH PORT
+;RTCVAL		.DB	RTCDEF		; SHADOW VALUE FOR RTC LATCH PORT
 IOPRVAL		.DW	0		; TEMP STORAGE FOR IOPR
 ;
 HB_BATCOND	.DB	0		; BATTERY CONDITION (0=LOW, 1=OK)
--- a/Source/HBIOS/hbios.inc
+++ b/Source/HBIOS/hbios.inc
@ -255,6 +255,7 @@ HB_SRCBNK	.EQU	HBX_XFCDAT + 4		; BNKCPY: SOURCE BANK ID
 HB_DSTADR	.EQU	HBX_XFCDAT + 5		; BNKCPY: DESTINATION ADDRESS
 HB_DSTBNK	.EQU	HBX_XFCDAT + 7		; BNKCPY: SOURCE ADDRESS
 HB_CPYLEN	.EQU	HBX_XFCDAT + 8		; BNKCPY: COPY LENGTH
+HB_RTCVAL	.EQU	HBX_XFCDAT + 14		; RTC LATCH SHADOW VALUE
 HB_LOCK		.EQU	HBX_XFCDAT + 15		; INVOKE: HBIOS MUTEX LOCK
 ;
 HBX_XFCFNS	.EQU	HBX_XFC + $10		; JUMP TABLE PORTION OF HBIOS PROXY INTERFACE AREA
--- a/Source/HBIOS/nascom.asm
+++ b/Source/HBIOS/nascom.asm
@ -4855,7 +4855,7 @@ MULDLP:	DJNZ	MULSKP		; DIVIDE BY 8
 	LD	B,$00
 	LD	IX,SPK_DLYADJ 	; The base address of the timing loop.
 	ADD	IX,BC		; Alter the length of the timing loop. Use an earlier starting point for each '1' lost by taking INT (L/4).
-	LD	A,(RTCVAL)	; Fetch the present border colour from BORDCR and move it to bits 2, 1 and 0 of the A register.
+	LD	A,(HB_RTCVAL)	; Fetch the present border colour from BORDCR and move it to bits 2, 1 and 0 of the A register.
 ;
 ;	The HL register holds the 'length of the timing loop' with 16 T states being used for each '1' in the L register and 1024 T states for each '1' in the H register.
 ;
@ -4897,8 +4897,8 @@ BE_END:	EI
 	POP	BC		; RECALL SYNTAX POINTER
 	POP	HL
 	RET
-;
-RTCVAL	.DB	0
+;;
+;RTCVAL	.DB	0
 ;
 ;	SETUP THE ONE SECOND TONE DURATION TABLE BASED ON PROCESSOR SPEED AND TONE FREQUENCY
 ;
--- a/Source/HBIOS/romldr.asm
+++ b/Source/HBIOS/romldr.asm
@ -32,6 +32,8 @@
 ; the desired executable image.
 ;
 #INCLUDE "std.asm"	; standard RomWBW constants
+
+#define ROMLDR
 ;
 #ifndef BOOT_DEFAULT
 #define BOOT_DEFAULT "H"
@ -206,6 +208,7 @@ prompt:
 	call	clrbuf			; zero fill the cmd buffer
 ;
 #if (DSKYENABLE)
+	call	DSKY_PREINIT		; *** TEMPORARY ***
 	call	DSKY_RESET		; clear DSKY
 	ld	hl,msg_sel		; boot select msg
 	call	DSKY_SHOW		; show on DSKY
@ -1105,10 +1108,11 @@ clrled:
 	out	(LEDPORT),a	; clear led
    #endif
    #if (LEDMODE == LEDMODE_RTC)
-	; Only bits 0 and 1 of the RTC latch are for the LEDs.  Here,
-	; we assume that it is OK to zero all bits of the RTC latch.
-	xor	a		; turn off
-	out	(LEDPORT),a	; clear led
+	; Bits 0 and 1 of the RTC latch are for the LEDs.
+	ld	a,(HB_RTCVAL)
+	and	~%00000011
+	out	(RTCIO),a	; clear led
+	ld	(HB_RTCVAL),a
    #endif
  #endif
 #endif
@ -1928,9 +1932,6 @@ str_err_api	.db	"Unexpected hardware BIOS API failure",0
 ; Includes
 ;=======================================================================
 ;
-#define USEDELAY
-; #include "util.asm"
-;
 #if (DSKYENABLE)
 #define	DSKY_KBD
  #if (DSKYMODE == DSKYMODE_V1)
--- a/Source/HBIOS/sd.asm
+++ b/Source/HBIOS/sd.asm
@ -368,10 +368,10 @@ SD_INIT:
 	LD	A,SD_OPRREG
 	CALL	PRTHEXBYTE
 ;
-	LD	A,(RTCVAL)		; GET RTC PORT SHADOW VALUE
+	LD	A,(HB_RTCVAL)		; GET RTC PORT SHADOW VALUE
 	AND	~SD_OPRMSK		; CLEAR OUR BITS
 	OR	SD_OPRDEF		; SET OUR BIT DEFAULTS
-	LD	(RTCVAL),A		; SAVE IT
+	LD	(HB_RTCVAL),A		; SAVE IT
 #ENDIF
 ;
 #IF (SDMODE == SDMODE_N8)
@ -380,10 +380,10 @@ SD_INIT:
 	LD	A,SD_OPRREG
 	CALL	PRTHEXBYTE
 ;
-	LD	A,(RTCVAL)		; GET RTC PORT SHADOW VALUE
+	LD	A,(HB_RTCVAL)		; GET RTC PORT SHADOW VALUE
 	AND	~SD_OPRMSK		; CLEAR OUR BITS
 	OR	SD_OPRDEF		; SET OUR BIT DEFAULTS
-	LD	(RTCVAL),A		; SAVE IT
+	LD	(HB_RTCVAL),A		; SAVE IT
 #ENDIF
 ;
 #IF (SDMODE == SDMODE_CSIO)
@ -401,10 +401,10 @@ SD_INIT:
 	LD	A,SD_TRDR
 	CALL	PRTHEXBYTE
 ;
-	LD	A,(RTCVAL)		; GET RTC PORT SHADOW VALUE
+	LD	A,(HB_RTCVAL)		; GET RTC PORT SHADOW VALUE
 	AND	~SD_OPRMSK		; CLEAR OUR BITS
 	OR	SD_OPRDEF		; SET OUR BIT DEFAULTS
-	LD	(RTCVAL),A		; SAVE IT
+	LD	(HB_RTCVAL),A		; SAVE IT
 #ENDIF
 ;
 #IF (SDMODE == SDMODE_PPI)
@ -465,10 +465,10 @@ SD_INIT:
 	LD	A,SD_TRDR
 	CALL	PRTHEXBYTE
 ;
-	LD	A,(RTCVAL)		; GET RTC PORT SHADOW VALUE
+	LD	A,(HB_RTCVAL)		; GET RTC PORT SHADOW VALUE
 	AND	~SD_OPRMSK		; CLEAR OUR BITS
 	OR	SD_OPRDEF		; SET OUR BIT DEFAULTS
-	LD	(RTCVAL),A		; SAVE IT
+	LD	(HB_RTCVAL),A		; SAVE IT
 #ENDIF
 ;
 #IF (SDMODE == SDMODE_MT)
@ -1677,7 +1677,7 @@ SD_SETUP:
 #ENDIF
 ;
 #IF ((SDMODE == SDMODE_JUHA) | (SDMODE == SDMODE_N8) | (SDMODE == SDMODE_CSIO) | (SDMODE == SDMODE_SC))
-	LD	A,(RTCVAL)
+	LD	A,(HB_RTCVAL)
 	LD	(SD_OPRVAL),A
 	OUT	(SD_OPRREG),A
 #ENDIF
--- a/Source/HBIOS/sn76489.asm
+++ b/Source/HBIOS/sn76489.asm
@ -15,10 +15,6 @@

 SN76489_PORT_LEFT	.EQU	$FF	; PORTS FOR ACCESSING THE SN76489 CHIP (LEFT)
 SN76489_PORT_RIGHT	.EQU	$FB	; PORTS FOR ACCESSING THE SN76489 CHIP (RIGHT)
-;SN76489_PORT_LEFT	.EQU	$FC	; PORTS FOR ACCESSING THE SN76489 CHIP (LEFT)
-;SN76489_PORT_RIGHT	.EQU	$F8	; PORTS FOR ACCESSING THE SN76489 CHIP (RIGHT)
-;;SN76489_PORT_LEFT	.EQU	$C7	; PORTS FOR ACCESSING THE SN76489 CHIP (LEFT)
-;;SN76489_PORT_RIGHT	.EQU	$C8	; PORTS FOR ACCESSING THE SN76489 CHIP (RIGHT)
 SN7_IDAT		.EQU	0
 SN7_TONECNT		.EQU	3	; COUNT NUMBER OF TONE CHANNELS
 SN7_NOISECNT		.EQU	1	; COUNT NUMBER OF NOISE CHANNELS
@ -74,7 +70,7 @@ SN7_VOLUME_OFF:


 #IFDEF SBCV2004
-	LD	A,(RTCVAL)
+	LD	A,(HB_RTCVAL)
 	OR	%00001000		; SBC-V2-004+ CHANGE
 	OUT	(RTCIO),A		; TO HALF CLOCK SPEED
 #ENDIF
@ -96,7 +92,7 @@ SN7_VOLUME_OFF:
 	OUT	(SN76489_PORT_RIGHT), A

 #IFDEF SBCV2004
-	LD	A,(RTCVAL)
+	LD	A,(HB_RTCVAL)
 	OR	%11110111		; SBC-V2-004+ CHANGE TO
 	OUT	(RTCIO),A		; NORMAL CLOCK SPEED
 #ENDIF
@ -256,7 +252,7 @@ SN7_APPLY_VOL:				; APPLY VOLUME TO BOTH LEFT AND RIGHT CHANNELS

 #IFDEF SBCV2004
 	PUSH	AF
-	LD	A,(RTCVAL)
+	LD	A,(HB_RTCVAL)
 	OR	%00001000		; SBC-V2-004+ CHANGE
 	OUT	(RTCIO),A		; TO HALF CLOCK SPEED
 	POP	AF
@ -266,7 +262,7 @@ SN7_APPLY_VOL:				; APPLY VOLUME TO BOTH LEFT AND RIGHT CHANNELS
 	OUT	(SN76489_PORT_RIGHT), A

 #IFDEF SBCV2004
-	LD	A,(RTCVAL)
+	LD	A,(HB_RTCVAL)
 	OR	%11110111		; SBC-V2-004+ CHANGE TO
 	OUT	(RTCIO),A		; NORMAL CLOCK SPEED
 #ENDIF
@ -301,7 +297,7 @@ SN7_APPLY_PRD:

 #IFDEF SBCV2004
 	PUSH	AF
-	LD	A,(RTCVAL)
+	LD	A,(HB_RTCVAL)
 	OR	%00001000		; SBC-V2-004+ CHANGE
 	OUT	(RTCIO),A		; TO HALF CLOCK SPEED
 	POP	AF
@ -311,7 +307,7 @@ SN7_APPLY_PRD:
 	OUT	(SN76489_PORT_RIGHT), A

 #IFDEF SBCV2004
-	LD	A,(RTCVAL)
+	LD	A,(HB_RTCVAL)
 	OR	%11110111		; SBC-V2-004+ CHANGE TO
 	OUT	(RTCIO),A		; NORMAL CLOCK SPEED
 #ENDIF
@ -338,7 +334,7 @@ SN7_APPLY_PRD:

 #IFDEF SBCV2004
 	PUSH	AF
-	LD	A,(RTCVAL)
+	LD	A,(HB_RTCVAL)
 	OR	%00001000		; SBC-V2-004+ CHANGE
 	OUT	(RTCIO),A		; TO HALF CLOCK SPEED
 	POP	AF
@ -348,7 +344,7 @@ SN7_APPLY_PRD:
 	OUT	(SN76489_PORT_RIGHT), A

 #IFDEF SBCV2004
-	LD	A,(RTCVAL)
+	LD	A,(HB_RTCVAL)
 	OR	%11110111		; SBC-V2-004+ CHANGE TO
 	OUT	(RTCIO),A		; NORMAL CLOCK SPEED
 #ENDIF
--- a/Source/HBIOS/spk.asm
+++ b/Source/HBIOS/spk.asm
@ -265,7 +265,7 @@ SP_BEEPER:
 	LD	B,$00
 	LD	IX,SPK_DLYADJ 		; The base address of the timing loop.
 	ADD	IX,BC			; Alter the length of the timing loop. Use an earlier starting point for each '1' lost by taking INT (L/4).
-	LD	A,(RTCVAL)		; Fetch the present border colour from BORDCR and move it to bits 2, 1 and 0 of the A register.
+	LD	A,(HB_RTCVAL)		; Fetch the present border colour from BORDCR and move it to bits 2, 1 and 0 of the A register.
 ;
 ;	The HL register holds the 'length of the timing loop' with 16 T states being used for each '1' in the L register and 1024 T states for each '1' in the H register.
 ;
--- a/Source/Images/d_zsdos/u0/ROMWBW.TXT
+++ b/Source/Images/d_zsdos/u0/ROMWBW.TXT
@ -13,7 +13,7 @@ RomWBW Distribution.

 ZSDOS is a replacement for the BDOS portion of the CP/M 2.2 operating
 system.  Since it does not include it's own command processor, the
-the ZCPR 1 D&J Command Processor has been included.
+the ZCPR D&J Command Processor has been included.

 The primary documentation for ZSDOS and ZCPR 1 are contained in the Doc
 directory of the RomWBW distribution.  The specific files are "ZSDOS
@ -140,7 +140,7 @@ distribution as possible.
 == ZSDOS 1.1 Files ==

 The following files came from the official ZSDOS distribution.  These
-are generall documented in the "ZSDOS Manual.pdf" document in the Doc
+are generally documented in the "ZSDOS Manual.pdf" document in the Doc
 directory of the RomWBW distribution.  Note that some of the files
 included in the ZSDOS distribution are not listed below because they
 have been superseded by more recent versions listed in other sections
@ -180,10 +180,17 @@ TESTCLOK.COM - Test a selected clock driver
 ZCAL.COM - Display a small one-month calendar to the screen
 ZCNFG.COM - Configuration tool for programs with .CFG files
 ZCNFG24.CFG - ZCNFG configuration file for ZCNFG
+ZMP.COM - ZModem communications program (requires dedicated comm port)
+ZMP.DOC - Documentation for ZMP
+ZMP.HLP - Help file for ZMP
+ZMXFER.OVR - Overlay file for ZMP
+ZMTERM.OVR - Overlay file for ZMP
+ZMINIT.OVR - Overlay file for ZMP
+ZMCONFIG.OVR - Overlay file for ZMP
 ZPATH.COM - Set or display ZSDOS and ZCPR search paths
-ZSCONFIG.COM - Dynamically sets many features of ZSDOS operating system
+ZSCONFIG.COM - Dynamically configure features of ZSDOS operating system
 ZSVSTAMP.COM - Preserves file date/time stamp across modifications
-ZSVSTAMP.DOC - Document describes the use and operation of ZSMSTAMP
+ZSVSTAMP.DOC - Document describes the use and operation of ZSVSTAMP

 == CP/M 2.2 Files ==

@ -194,12 +201,12 @@ called STAT is useful for modifying the IOBYTE.  Most of these
 applications are documented in the "CPM Manual.pdf" document in the Doc
 directory of the RomWBW distribution.

-ASM.COM - DRI 8080 assembler
+ASM.COM - DRI 8080 assembler producing Intel hex files
 LIB.COM - DRI relocatable object file librarian
 LINK.COM - DRI relocatable object file linker
 LOAD.COM - DRI loader for Intel hex files
-MAC.COM - DRI 8080 macro assembler
-RMAC.COM - DRI 8080 macro assembler generating relocatable object files
+MAC.COM - DRI 8080 macro assembler producing Intel hex files
+RMAC.COM - DRI 8080 macro assembler producing relocatable object files
 STAT.COM - DRI multi-purpose file/disk/device info & configuration tool
 SUBMIT.COM - DRI batch file submission tool
 XSUB.COM - DRI batch file enhancer resident system extension
@ -261,7 +268,7 @@ UNZIP.DOC - Documentation for UNZIPZ
 XSUB1.COM - Replacement for DRI SUB (from Lars Nelson)
 ZAP.COM - Interactive disk & file utility
 ZDE.COM - Compact WordStar-like editor
-ZDENST.COM - ZCNFG configuration tool for ZDE.COM
+ZDENST.COM - Installation/configuration tool for ZDE
 KERCPM22.COM - Kermit file transfer application
 LBREXT.COM - Extract file from .LBR libraries
 LBREXT36.CFG - ZCNFG configuration file for LBREXT
--- a/Source/ver.inc
+++ b/Source/ver.inc
@ -2,4 +2,4 @@
 #DEFINE	RMN	1
 #DEFINE	RUP	1
 #DEFINE	RTP	03
-#DEFINE BIOSVER	"3.1.1-pre.108"
+#DEFINE BIOSVER	"3.1.1-pre.109"
--- a/Source/ver.lib
+++ b/Source/ver.lib
@ -3,5 +3,5 @@ rmn	equ	1
 rup	equ	1
 rtp	equ	0
 biosver	macro
-	db	"3.1.1-pre.108"
+	db	"3.1.1-pre.109"
 	endm