diff --git a/Doc/RomWBW Applications.pdf b/Doc/RomWBW Applications.pdf
index dcf863fc..0837e86f 100644
Binary files a/Doc/RomWBW Applications.pdf and b/Doc/RomWBW Applications.pdf differ
diff --git a/Doc/RomWBW Architecture.pdf b/Doc/RomWBW Architecture.pdf
index 8a116e0a..3ca943e0 100644
Binary files a/Doc/RomWBW Architecture.pdf and b/Doc/RomWBW Architecture.pdf differ
diff --git a/Doc/RomWBW Disk Catalog.pdf b/Doc/RomWBW Disk Catalog.pdf
index eb0583ed..aa9400af 100644
Binary files a/Doc/RomWBW Disk Catalog.pdf and b/Doc/RomWBW Disk Catalog.pdf differ
diff --git a/Doc/RomWBW Getting Started.pdf b/Doc/RomWBW Getting Started.pdf
index 65d14983..da962bbd 100644
Binary files a/Doc/RomWBW Getting Started.pdf and b/Doc/RomWBW Getting Started.pdf differ
diff --git a/Source/Apps/Assign.asm b/Source/Apps/Assign.asm
index c6214c65..c080991b 100644
--- a/Source/Apps/Assign.asm
+++ b/Source/Apps/Assign.asm
@@ -26,6 +26,7 @@
 ;   2020-04-29 [WBW] Updated for larger DPH (16 -> 20 bytes)
 ;   2020-05-06 [WBW] Add patch level to version compare
 ;   2020-05-10 [WBW] Set media change flag in XDPH for CP/M 3
+;   2020-05-12 [WBW] Back out media change flag
 ;_______________________________________________________________________________
 ;
 ; ToDo:
@@ -778,10 +779,10 @@ instc2:
 	inc	hl		; bump to slice field of DPH field
 	ld	a,(de)		; get slice from mapwrk
 	ld	(hl),a		; put slice into DPH field
-	ld	a,11		; media byte is 11 bytes ahead
-	call	addhl		; bump HL to media byte adr
-	or	$FF		; use $FF to signify media change
-	ld	(hl),a		; set media flag byte
+;	ld	a,11		; media byte is 11 bytes ahead
+;	call	addhl		; bump HL to media byte adr
+;	or	$FF		; use $FF to signify media change
+;	ld	(hl),a		; set media flag byte
 	inc	de		; bump to next mapwrk entry
 	inc	de		; ...
 	inc	de		; ...
@@ -1892,7 +1893,7 @@ stack	.equ	$		; stack top
 ; Messages
 ;
 indent	.db	"   ",0
-msgban1	.db	"ASSIGN v1.3 for RomWBW CP/M, 10-May-2020",0
+msgban1	.db	"ASSIGN v1.4 for RomWBW CP/M, 12-May-2020",0
 msghb	.db	" (HBIOS Mode)",0
 msgub	.db	" (UBIOS Mode)",0
 msgban2	.db	"Copyright 2020, Wayne Warthen, GNU GPL v3",0
diff --git a/Source/Apps/Tune/Tune.asm b/Source/Apps/Tune/Tune.asm
index 79bb1aac..a6e4bfb4 100644
--- a/Source/Apps/Tune/Tune.asm
+++ b/Source/Apps/Tune/Tune.asm
@@ -95,6 +95,7 @@ Id		.EQU	1	; 5) Insert official identificator
 
 	CALL	CLI_ABRT_IF_OPT_FIRST
 	CALL	CLI_HAVE_HBIOS_SWITCH
+	CALL	CLI_OCTAVE_ADJST
 	JP	CONTINUE
 
 CONTINUE:
@@ -581,14 +582,14 @@ FILTYP		.DB	0	; Sound file type (TYPPT2, TYPPT3, TYPMYM)
 ;
 TMP		.DB	0	; work around use of undocumented Z80
 
-HBIOSOPT:	.DB	"--HBIOS", 0
 HBIOSMD		.DB	0	; NON-ZERO IF USING HBIOS SOUND DRIVER, ZERO OTHERWISE
+OCTAVEADJ	.DB	0	; AMOUNT TO ADJUST OCTAVE UP OR DOWN
 
 MSGBAN		.DB	"Tune Player for RomWBW v3.1, 25-Apr-2020",0
 MSGUSE		.DB	"Copyright (C) 2020, Wayne Warthen, GNU GPL v3",13,10
 		.DB	"PTxPlayer Copyright (C) 2004-2007 S.V.Bulba",13,10
 		.DB	"MYMPlay by Marq/Lieves!Tuore",13,10,13,10
-		.DB	"Usage: TUNE <filename>.[PT2|PT3|MYM] [--hbios]",0
+		.DB	"Usage: TUNE <filename>.[PT2|PT3|MYM] [--hbios] [+tn|-tn]",0
 MSGBIO		.DB	"Incompatible BIOS or version, "
 		.DB	"HBIOS v", '0' + RMJ, ".", '0' + RMN, " required",0
 MSGPLT		.DB	"Hardware error, system not supported!",0
@@ -2003,74 +2004,74 @@ LOUT2	CALL 	NORMIO
 	RET			; AND DONE
 
 PLAYVIAHBIOS:
-;
-;	CHANNEL 0 (LEFT)
-;
-	LD	BC, (BF_SNDVOL*256)+0	; SET VOLUME
-	LD	A, (AYREGS + AmplA)	; DEVICE 0
-	ADD	A,A			; GET 4-BIT 	
+;	CHANNEL 0
+	LD	HL, AYREGS + AmplA
+	LD	DE, AYREGS + TonA
+	LD	B, 0
+	CALL	PLAYNOTE
+;
+;	CHANNEL 1
+	LD	HL, AYREGS + AmplB
+	LD	DE, AYREGS + TonB
+	LD	B, 1
+	CALL	PLAYNOTE
+
+;	CHANNEL 2
+	LD	HL, AYREGS + AmplC
+	LD	DE, AYREGS + TonC
+	LD	B, 2
+	JP	PLAYNOTE
+
+PLAYNOTE:
+	PUSH	BC			; CHANNEL IN B
+	PUSH	DE			; PERIOD ADDR IN DE
+
+	LD	A, (HL)
+	ADD	A,A			; GET 4-BIT
 	ADD	A,A			; VOLUME 0-15
 	ADD	A,A			; AND CONVERT
-	ADD	A,A			; TO HBIOS	
+	ADD	A,A			; TO HBIOS
 	LD	L, A                    ; RANGE 0-255
+	LD	BC, (BF_SNDVOL*256)+0	; SET VOLUME
 	RST	08
 ;
-	LD	BC, (BF_SNDPRD*256)+0	; SET PERIOD
-	LD	HL, (AYREGS+TonA)	; DEVICE 0
+	POP	HL			; RESTORE PERIOD ADDR
+	LD	A, (HL)			; DEVICE 0
+	INC	HL
+	LD	H, (HL)
+	LD	L, A
 	LD	A, H       		; GET 12-BIT ONE PERIOD
 	AND	$0F			; MASK OFF HIGH
-	LD	H, A                    ; NIBBLE 
-	RST	08
-;
-	LD	BC, (BF_SNDPLAY*256)+0	; PLAY
-	LD	D, 0			; DEVICE 0
-	RST	08			; CHANNEL 0
-;
-;	CHANNEL 1 (MIDDLE)
-;
-	LD	BC, (BF_SNDVOL*256)+0	; SET VOLUME
-	LD	A, (AYREGS + AmplB)	; DEVICE 0
-	ADD	A,A			; GET 4-BIT 	
-	ADD	A,A			; VOLUME 0-15
-	ADD	A,A			; AND CONVERT
-	ADD	A,A			; TO HBIOS	
-	LD	L, A                    ; RANGE 0-255
-	RST	08
-;
+	LD	H, A                    ; NIBBLE
+
+	LD	A, (OCTAVEADJ)
+	OR	A
+	JR	Z, PLAYNOTE3		; NO OCTAVE ADJUSTMENT
+	BIT	7, A
+	JR	Z, PLAYNOTE2		; OCTAVE DOWN ADJUSTMENT
+
+PLAYNOTE1:
+	ADD	HL, HL			; MULTIPLE BY 2 FOR EACH OCTAVE
+	INC	A
+	JR	NZ, PLAYNOTE1
+	JR	PLAYNOTE3
+
+PLAYNOTE2:
+	SRL	H			; DIVIDE BY 2 FOR EACH OCTAVE
+	RR	L
+	DEC	A
+	JR	NZ, PLAYNOTE2
+
+PLAYNOTE3
 	LD	BC, (BF_SNDPRD*256)+0	; SET PERIOD
-	LD	HL, (AYREGS+TonB)	; DEVICE 0
-	ld	A, H       		; GET 12-BIT ONE PERIOD
-	AND	$0F			; MASK OFF HIGH
-	LD	H, A                    ; NIBBLE 
 	RST	08
 ;
+	POP	DE			; RESTORE CHANNEL IN D (FROM B)
 	LD	BC, (BF_SNDPLAY*256)+0	; PLAY
-	LD	D, 1			; DEVICE 0
-	RST	08			; CHANNEL 0
-;
-;	CHANNEL 2 (RIGHT)
-;
-	LD	BC, (BF_SNDVOL*256)+0	; SET VOLUME
-	LD	A, (AYREGS + AmplC)	; DEVICE 0
-	ADD	A,A			; GET 4-BIT 	
-	ADD	A,A			; VOLUME 0-15
-	ADD	A,A			; AND CONVERT
-	ADD	A,A			; TO HBIOS	
-	LD	L, A                    ; RANGE 0-255
 	RST	08
-;
-	LD	BC, (BF_SNDPRD*256)+0	; SET PERIOD
-	LD	HL, (AYREGS+TonC)	; DEVICE 0
-	LD	A, H       		; GET 12-BIT ONE PERIOD
-	AND	$0F			; MASK OFF HIGH
-	LD	H, A                    ; NIBBLE 
-	RST	08
-;
-	LD	BC, (BF_SNDPLAY*256)+0	; PLAY
-	LD	D, 2			; DEVICE 0
-	RST	08			; CHANNEL 0
-	
+
 	RET
+
 #ENDIF
 
 #IF ACBBAC
diff --git a/Source/Apps/Tune/cli.inc b/Source/Apps/Tune/cli.inc
index 9f8b2551..fc901068 100644
--- a/Source/Apps/Tune/cli.inc
+++ b/Source/Apps/Tune/cli.inc
@@ -1,5 +1,4 @@
 
-
 CLI_ABRT_IF_OPT_FIRST:
 	LD	A, (FCB+1)
 	CP	'-'			; OPTION FIRST OR - MISSING FILENAME?
@@ -11,7 +10,7 @@ CLI_HAVE_HBIOS_SWITCH:
 	LD	DE, HBIOSOPT
 	CALL	STRINDEX
 	JR	NZ, CLI_HAVE_HBIOS_SWITCH1
-	OR	$FF			; MATCHED --HBIOS 
+	OR	$FF			; MATCHED --HBIOS
 	LD	(HBIOSMD), A
 	LD	BC,(BF_SYSGET*256)+BF_SND
 	RST	08			; CHECK WE HAVE
@@ -35,4 +34,53 @@ CLI_ABRT_UNSUPPFILTYP:
 
 CLI_ABRT_UNSUPPFILTYP1:
 	POP	AF
-	RET
\ No newline at end of file
+	RET
+
+CLI_OCTAVE_ADJST:			; SEARCH FOR OCTAVE ADJUSTMENT SWITCH (-n or +n)
+	LD	HL, CLIARGS		; TEST FOR --HBIOS ON COMMAND LINE
+	LD	DE, DOWN1
+	CALL	STRINDEX
+	JR	NZ, CLI_OCTAVE_ADJST1
+
+	LD	A, -1
+	JR 	CLI_OCTAVE_ADJST5
+
+CLI_OCTAVE_ADJST1:
+	LD	HL, CLIARGS		; TEST FOR --HBIOS ON COMMAND LINE
+	LD	DE, DOWN2
+	CALL	STRINDEX
+	JR	NZ, CLI_OCTAVE_ADJST2
+
+	LD	A, -2
+	JR 	CLI_OCTAVE_ADJST5
+
+CLI_OCTAVE_ADJST2:
+	LD	HL, CLIARGS		; TEST FOR --HBIOS ON COMMAND LINE
+	LD	DE, UP1
+	CALL	STRINDEX
+	JR	NZ, CLI_OCTAVE_ADJST3
+
+	LD	A, 1
+	JR 	CLI_OCTAVE_ADJST5
+
+CLI_OCTAVE_ADJST3:
+	LD	HL, CLIARGS		; TEST FOR --HBIOS ON COMMAND LINE
+	LD	DE, UP2
+	CALL	STRINDEX
+	JR	NZ, CLI_OCTAVE_ADJST4
+
+	LD	A, 2
+	JR 	CLI_OCTAVE_ADJST5
+
+CLI_OCTAVE_ADJST4:
+	LD	A, 0
+
+CLI_OCTAVE_ADJST5:
+	LD	(OCTAVEADJ), A
+	RET
+
+HBIOSOPT:	.DB	"--HBIOS", 0
+DOWN1		.DB	"-t1", 0			; DOWN AN OCTAVE
+DOWN2		.DB	"-t2", 0			; DOWN TWO OCTAVE
+UP1		.DB	"+t1", 0			; UP AN OCTAVE
+UP2		.DB	"+t2", 0			; UP TWO OCTAVE
diff --git a/Source/CBIOS/cbios.asm b/Source/CBIOS/cbios.asm
index acaaa3df..a1036ccd 100644
--- a/Source/CBIOS/cbios.asm
+++ b/Source/CBIOS/cbios.asm
@@ -1358,6 +1358,8 @@ DSK_MBR0:
 ;
 #IFDEF PLTWBW
 	; SWITCH TO BIOS BANK TO ACCESS DISK BUFFER
+	LD	(STKSAV),SP	; SAVE CUR STACK
+	LD	SP,XSTACK	; NEW STACK IN HI MEM
 	LD	A,(HB_CURBNK)	; GET CUR BANK
 	PUSH	AF		; SAVE CUR BANK
 	LD	A,(BNKBIOS)	; BIOS BANK
@@ -1370,7 +1372,12 @@ DSK_MBR0:
 	LD	A,H		; PREV BANK TO A
 	CALL	HB_BNKSEL	; SELECT IT
 	POP	AF		; ORIGINAL RESULT BACK
+	LD	SP,(STKSAV)	; RESTORE ORIGINAL STACK
 	RET
+	
+	.FILL	32,0
+XSTACK	.EQU	$
+
 #ENDIF
 ;
 DSK_MBR1:
@@ -1700,6 +1707,7 @@ CCPBUF		.DW	0		; ADDRESS OF CCP BUF IN BIOS BANK
 MEDID		.DB	0		; TEMP STORAGE FOR MEDIA ID
 SLICE		.DB	0		; CURRENT SLICE
 SPS		.DW	0		; SECTORS PER SLICE
+STKSAV		.DW	0		; TEMP SAVED STACK POINTER
 ;
 #IFDEF PLTWBW
 BNKBIOS		.DB	0		; BIOS BANK ID
diff --git a/Source/CPM3/diskio.z80 b/Source/CPM3/diskio.z80
index 1856eefa..45df4372 100644
--- a/Source/CPM3/diskio.z80
+++ b/Source/CPM3/diskio.z80
@@ -191,7 +191,7 @@ dpb$max:
 	db  	5		; bsh: block shift factor
 	db  	31		; blm: block mask
 	db  	1		; exm: extent mask
-	dw  	2047		; dsm: total storage in blocks - 1 = (8mb / 4k bls) - 1 = 2047
+	dw  	2048 - 1	; dsm: total storage in blocks - 1 = (8mb / 4k bls) - 1 = 2047
 	dw  	1024 - 1	; drm: dir entries - 1
 	db  	11111111b	; al0: dir blk bit map, first byte
 	db  	00000000b	; al1: dir blk bit map, second byte
@@ -211,7 +211,7 @@ dpb$rom:	; 384K ROM Drive
 	dw  	256 - 1		; drm: dir entries - 1 = 256 - 1 = 255
 	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
+	dw  	8040h		; cks: directory check vector size - permanent storage = 8000H
 	dw  	0		; off: reserved tracks = 16 trks * (16 trks * 16 heads * 16 secs * 512 bytes) = 128k
 	db	2		; psh: 2 for 512 byte sectors
 	db	3		; phm: (512 / 128) - 1
@@ -226,7 +226,7 @@ dpb$ram:	; 256K RAM Drive
 	dw  	256 - 1		; drm: dir entries - 1 = 256 - 1 = 255
 	db  	11110000b	; al0: dir blk bit map, first byte
 	db  	00000000b	; al1: dir blk bit map, second byte
-	dw  	8000h		; cks: directory check vector size - permanent storage = 8000H
+	dw  	8040h		; cks: directory check vector size - permanent storage = 8000H
 	dw  	0		; off: reserved tracks = 16 trks * (16 trks * 16 heads * 16 secs * 512 bytes) = 128k
 	db	2		; psh: 2 for 512 byte sectors
 	db	3		; phm: (512 / 128) - 1
@@ -236,11 +236,11 @@ dpb$rf:		; 4MB RAM Floppy Drive
 	db  	4		; bsh: block shift factor
 	db  	15		; blm: block mask
 	db  	0		; exm: extent mask
-	dw  	2047		; dsm: total storage in blocks - 1 = (4mb / 2k bls) - 1 = 2047
-	dw  	255		; drm: dir entries - 1 = 256 - 1 = 255
+	dw  	2048 - 1	; dsm: total storage in blocks - 1 = (4mb / 2k bls) - 1 = 2047
+	dw  	256 - 1		; drm: dir entries - 1 = 256 - 1 = 255
 	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
+	dw  	8040h		; cks: directory check vector size - permanent storage = 8000H
 	dw  	0		; off: reserved tracks = 0 trks
 	db	2		; psh: 2 for 512 byte sectors
 	db	3		; phm: (512 / 128) - 1
@@ -250,7 +250,7 @@ dpb$hd:		; 8MB Hard Disk Drive w/ 512 dir entries
 	db  	5		; bsh: block shift factor
 	db  	31		; blm: block mask
 	db  	1		; exm: extent mask
-	dw  	2047		; dsm: total storage in blocks - 1 = (8mb / 4k bls) - 1 = 2047
+	dw  	2048 - 1	; dsm: total storage in blocks - 1 = (8mb / 4k bls) - 1 = 2047
 	dw  	512 - 1		; drm: dir entries - 1 = 512 - 1 = 511
 	db  	11110000b	; al0: dir blk bit map, first byte
 	db  	00000000b	; al1: dir blk bit map, second byte
@@ -264,8 +264,8 @@ dpb$fd720:	; 3.5" DS/DD Floppy Drive (720K)
 	db  	4		; bsh: block shift factor
 	db  	15		; blm: block mask
 	db  	0		; exm: extent mask
-	dw  	350		; dsm: total storage in blocks - 1 blk = ((720k - 18k off) / 2k bls) - 1 = 350
-	dw  	127		; drm: dir entries - 1 = 128 - 1 = 127
+	dw  	351 - 1		; dsm: total storage in blocks - 1 blk = ((720k - 18k off) / 2k bls) - 1 = 350
+	dw  	128 - 1		; drm: dir entries - 1 = 128 - 1 = 127
 	db  	11000000b	; al0: dir blk bit map, first byte
 	db  	00000000b	; al1: dir blk bit map, second byte
 	dw  	32		; cks: directory check vector size = 128 / 4
@@ -278,8 +278,8 @@ dpb_fd144:	; 3.5" DS/HD Floppy Drive (1.44M)
 	db  	4		; bsh: block shift factor
 	db  	15		; blm: block mask
 	db  	0		; exm: extent mask
-	dw  	710		; dsm: total storage in blocks - 1 blk = ((1,440k - 18k off) / 2k bls) - 1 = 710
-	dw  	255		; drm: dir entries - 1 = 256 - 1 = 255
+	dw  	711 - 1		; dsm: total storage in blocks - 1 blk = ((1,440k - 18k off) / 2k bls) - 1 = 710
+	dw  	256 - 1		; drm: dir entries - 1 = 256 - 1 = 255
 	db  	11110000b	; 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
@@ -292,8 +292,8 @@ dpb_fd360:	; 5.25" DS/DD Floppy Drive (360K)
 	db  	4		; bsh: block shift factor
 	db  	15		; blm: block mask
 	db  	1		; exm: extent mask
-	dw  	170		; dsm: total storage in blocks - 1 blk = ((360k - 18k off) / 2k bls) - 1 = 170
-	dw  	127		; drm: dir entries - 1 = 128 - 1 = 127
+	dw  	171 - 1		; dsm: total storage in blocks - 1 blk = ((360k - 18k off) / 2k bls) - 1 = 170
+	dw  	128 - 1		; drm: dir entries - 1 = 128 - 1 = 127
 	db  	11110000b	; al0: dir blk bit map, first byte
 	db  	00000000b	; al1: dir blk bit map, second byte
 	dw  	32		; cks: directory check vector size = 128 / 4
@@ -306,8 +306,8 @@ dpb_fd120:	; 5.25" DS/HD Floppy Drive (1.2M)
 	db  	4		; bsh: block shift factor
 	db  	15		; blm: block mask
 	db  	0		; exm: extent mask
-	dw  	591		; dsm: total storage in blocks - 1 blk = ((1,200k - 15k off) / 2k bls) - 1 = 591
-	dw  	255		; drm: dir entries - 1 = 256 - 1 = 255
+	dw  	592 - 1		; dsm: total storage in blocks - 1 blk = ((1,200k - 15k off) / 2k bls) - 1 = 591
+	dw  	256 - 1		; drm: dir entries - 1 = 256 - 1 = 255
 	db  	11110000b	; 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
@@ -320,8 +320,8 @@ dpb_fd111:	; 8" DS/DD Floppy Drive (1.11M)
 	db  	4		; bsh: block shift factor
 	db  	15		; blm: block mask
 	db  	0		; exm: extent mask
-	dw  	569		; dsm: total storage in blocks - 1 blk = ((1,155k - 15k off) / 2k bls) - 1 = 569
-	dw  	255		; drm: dir entries - 1 = 256 - 1 = 255
+	dw  	570 - 1		; dsm: total storage in blocks - 1 blk = ((1,155k - 15k off) / 2k bls) - 1 = 569
+	dw  	256 - 1		; drm: dir entries - 1 = 256 - 1 = 255
 	db  	11110000b	; 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
@@ -650,6 +650,7 @@ dsk$rw$retry:
 	jr	dsk$rw9			; do the disk I/O
 	
 dsk$rw2:
+	; LBA I/O
 	push	de			; save hiword of LBA
 	push	hl			; save loword of LBA
 	
diff --git a/Source/CPM3/genbnk.dat b/Source/CPM3/genbnk.dat
index 060a2c79..7ece8384 100644
--- a/Source/CPM3/genbnk.dat
+++ b/Source/CPM3/genbnk.dat
@@ -57,7 +57,7 @@ ALTBNKSM = Y
 ALTBNKSN = Y
 ALTBNKSO = Y
 ALTBNKSP = Y
-NDIRRECA = 02
+NDIRRECA = 08
 NDIRRECB = 00
 NDIRRECC = 00
 NDIRRECD = 00
@@ -73,7 +73,7 @@ NDIRRECM = 00
 NDIRRECN = 00
 NDIRRECO = 00
 NDIRRECP = 00
-NDTARECA = 02
+NDTARECA = 10
 NDTARECB = 00
 NDTARECC = 00
 NDTARECD = 00
diff --git a/Source/CPM3/loader.asm b/Source/CPM3/loader.asm
index ef80711d..42a8082d 100644
--- a/Source/CPM3/loader.asm
+++ b/Source/CPM3/loader.asm
@@ -27,9 +27,12 @@
 ;
 #INCLUDE "../ver.inc"
 ;
+; BELOW, SYS_END MUST BE SET TO THE SIZE OF CPMLDR.BIN + SYS_LOC.  IF
+; THE SIZE OF CPMLDR.BIN CHANGES, SYS_END MUST BE UPDATED!!!
+;
 SYS_ENT		.EQU	$0100		; SYSTEM (OS) ENTRY POINT ADDRESS
 SYS_LOC		.EQU	$0100		; STARTING ADDRESS TO LOAD SYSTEM IMAGE
-SYS_END		.EQU	$1480		; ENDING ADDRESS OF SYSTEM IMAGE
+SYS_END		.EQU	$1580 + SYS_LOC	; ENDING ADDRESS OF SYSTEM IMAGE
 ;
 SEC_SIZE	.EQU	512		; DISK SECTOR SIZE
 BLK_SIZE	.EQU	128		; OS BLOCK/RECORD SIZE
diff --git a/Source/Doc/Applications.md b/Source/Doc/Applications.md
index 4a145533..236b02e2 100644
--- a/Source/Doc/Applications.md
+++ b/Source/Doc/Applications.md
@@ -949,6 +949,24 @@ accurately pace the sound file output. If no system timer is
 available, a delay loop is calculated instead. The delay loop will not
 be as accurate as the system timer.
 
+There are two modes of operations.  A direct hardware interface for the
+AY-3-8910 or YM2149 chips, or a compatibility layer thru HBIOS supporting
+the SN76489 chip.
+
+By default the application will attempt to interface directly to the sound
+chip.  The optional argument `--hbios` supplied after the filename, will
+enable the application to use the HBIOS sound driver.
+
+The HBIOS mode also support other switch as desribed below.
+
+| Switch      | Description                                            |
+| ----------- | ------------------------------------------------------ |
+|  `--hbios`  | Utilise HBIOS' sound driver                            |
+| `+t1`       | Play tune an octave higher                             |
+| `+t2`       | Play tune two octaves higher                           |
+| `-t1`       | Play tune an octave lower                              |
+| `-t2`       | Play tune two octaves lower                            |
+
 All RomWBW operating system boot disks include a selection of sound
 files in user area 3.
 
@@ -960,4 +978,4 @@ software was adapted and embedded from pre-existing sources. The YM
 player code is from MYMPLAY 0.4 by Lieves!Tuore and the PT player code
 is (c)2004-2007 S.V.Bulba <vorobey@mail.khstu.ru>.
 
-The source code is provided in the RomWBW distribution.
\ No newline at end of file
+The source code is provided in the RomWBW distribution.
diff --git a/Source/Doc/Architecture.md b/Source/Doc/Architecture.md
index ffc3120e..f3e20ea3 100644
--- a/Source/Doc/Architecture.md
+++ b/Source/Doc/Architecture.md
@@ -1392,20 +1392,38 @@ supplied is beyond driver capabilities, register A will be set to $FF.
 | _Entry Parameters_
 |       B: 0x53
 |       C: Audio Device Unit ID
-|       L: Note (0 to 255 quarter notes)
+|       HL: Value of note to play
 
 |      _Returned Values_
 |           A: Status (0=OK, else error)
 
-This function sets the sound chip period parameter according to
-standardized notes.
-
-The value corresponds to standard musical notes.  The value allows
-for selection of a quarter of a semitone by giving a value between 0
-and up to the drivers maximum supported value. The lowest note is (0).
-
-For the SN76489 chip, 0 corresponds to note A1# and the value 249 is
-the maximum supported value, and it corresponds to note C7.
+This function sets the sound chip period parameter with steps of quarter
+of a semitone.  The value of 0 (lowest) corresponds to Bb/A# in octave 0.
+
+Increase by steps of 4 to select the next corresponding note.
+
+Increase by steps of 48 to select the same note in next octave.
+
+If the driver is able to generate the requested note, a success (0) is
+returned, otherwise a non-zero error state will be returned.
+
+The following table shows the mapping of the input value in HL
+to the corresponding octave and note.
+
+| Note  | Octave 0 | Octave 1 | Octave 2 | Octave 3 | Octave 4 | Octave 5 | Octave 6 |
+|-------|----------|----------|----------|----------|----------|----------|----------|
+| Bb/A# | 0        | 48       | 96       | 144      | 192      | 240      | 288      |
+| B     | 4        | 52       | 100      | 148      | 196      | 244      | 292      |
+| C     | 8        | 56       | 104      | 152      | 200      | 248      | 296      |
+| C#/Db | 12       | 60       | 108      | 156      | 204      | 252      | 300      |
+| D     | 16       | 64       | 112      | 160      | 208      | 256      | 304      |
+| Eb/D# | 20       | 68       | 116      | 164      | 212      | 260      | 308      |
+| E     | 24       | 72       | 120      | 168      | 216      | 264      | 312      |
+| F     | 28       | 76       | 124      | 172      | 220      | 268      | 316      |
+| F#/Gb | 32       | 80       | 128      | 176      | 224      | 272      | 320      |
+| G     | 36       | 84       | 132      | 180      | 228      | 276      | 324      |
+| Ab/G# | 40       | 88       | 136      | 184      | 232      | 280      | 328      |
+| A     | 44       | 92       | 140      | 188      | 236      | 284      | 332      |
 
 ### Function 0x54 -- Sound Play (SNDPLAY)
 
diff --git a/Source/HBIOS/audio.inc b/Source/HBIOS/audio.inc
index a3ca68da..b6365494 100644
--- a/Source/HBIOS/audio.inc
+++ b/Source/HBIOS/audio.inc
@@ -72,4 +72,4 @@ AUD_NOTE2:
 	LD	H, $FF			; OTHERWISE RETURN -1 PERIOD (ERROR)
 	LD	L, $FF
 	RET
-#ENDIF
\ No newline at end of file
+#ENDIF
diff --git a/Source/HBIOS/ay38910.asm b/Source/HBIOS/ay38910.asm
index 01dc90a5..38744a31 100644
--- a/Source/HBIOS/ay38910.asm
+++ b/Source/HBIOS/ay38910.asm
@@ -4,6 +4,10 @@
 ;
 ;======================================================================
 ;
+
+#include "cfg_state.inc"
+
+
 AY_RCSND	.EQU	0		; 0 = EB MODULE, 1=MF MODULE
 ;
 #IF (AYMODE == AYMODE_SCG)
@@ -123,13 +127,46 @@ AY_FND:	LD	IY, AY_IDAT		; SETUP FUNCTION TABLE
 	LD	DE,(AY_R3CHBP*256)+$00
 	CALL	AY_WRTPSG		; R03 = $00 = XXXX0000
 ;
-	CALL	LDELAY			; HALF SECOND DELAY
-;
-	LD	E,$00			; SET VOLUME OFF
-	CALL	AY_SETV			; ON ALL CHANNELS
+
+#IF SYSTIMEN
+	LD	A, TICKFREQ / 3		; SCHEDULE IN 1/3 SECOND TO TURN OFF SOUND
+	LD	(AY_TIMTIK), A
+
+	LD	HL, (VEC_TICK + 1)	; GET CUR SECONDS VECTOR
+	LD	(AY_TIMHOOK), HL	; SAVE IT INTERNALLY
+	LD	HL, AY_TIMER		; INSTALL TIMER HOOK HANDLER
+	LD	(VEC_TICK + 1), HL
+
+#ELSE
+ 	CALL	LDELAY			; HALF SECOND DELAY
+ 	LD	E,$00			; SET VOLUME OFF
+ 	CALL	AY_SETV			; ON ALL CHANNELS
+
+#ENDIF
 ;
 	XOR	A			; SUCCESSFULL INIT
 	RET
+
+#IF SYSTIMEN
+AY_TIMER:
+	LD	A, (AY_TIMTIK)
+	DEC	A
+	LD	(AY_TIMTIK), A
+	JR	NZ, AY_TIMER1
+
+	LD	HL, (AY_TIMHOOK)	; REMOVE US FROM THE TIMER HOOKS LIST
+	LD	(VEC_TICK + 1), HL
+
+	LD	E,$00			; SET VOLUME OFF
+	CALL	AY_SETV			; ON ALL CHANNELS
+
+AY_TIMER1:
+	JP	0			; OVERWRITTEN WITH NEXT HANDLER
+AY_TIMHOOK:	.EQU	$ - 2
+
+AY_TIMTIK	.DB	0		; COUNT DOWN TO FINISH BOOT BEEP
+
+#ENDIF
 ;
 ;======================================================================
 ;	INITIALIZE DEVICE
diff --git a/Source/HBIOS/cfg_state.inc b/Source/HBIOS/cfg_state.inc
new file mode 100644
index 00000000..754f434b
--- /dev/null
+++ b/Source/HBIOS/cfg_state.inc
@@ -0,0 +1,30 @@
+
+#IFNDEF CFG_STATE
+#DEFINE CFG_STATE
+
+SYSTIMEN	.EQU	FALSE
+
+#IF (CTCENABLE & INTMODE == 2 & CTCTIMER)
+SYSTIMEN	.SET	TRUE
+#ENDIF
+
+#IF (TMSENABLE & INTMODE == 1 & TMSTIMENABLE)
+SYSTIMEN	.SET	TRUE
+#ENDIF
+
+#IF (INTMODE == 1 & PLATFORM == PLT_SBC & HTIMENABLE)
+SYSTIMEN	.SET	TRUE
+#ENDIF
+
+#IF (INTMODE == 2 & CPUFAM == CPU_Z180)
+SYSTIMEN	.SET	TRUE
+#ENDIF
+
+	.ECHO "TIMER INTERRUPT "
+#IF SYSTIMEN
+	.ECHO "ACTIVE\n"
+#ELSE
+	.ECHO "NOT ACTIVE\n"
+#ENDIF
+
+#ENDIF
diff --git a/Source/ZPM3/loader.asm b/Source/ZPM3/loader.asm
index ef80711d..42a8082d 100644
--- a/Source/ZPM3/loader.asm
+++ b/Source/ZPM3/loader.asm
@@ -27,9 +27,12 @@
 ;
 #INCLUDE "../ver.inc"
 ;
+; BELOW, SYS_END MUST BE SET TO THE SIZE OF CPMLDR.BIN + SYS_LOC.  IF
+; THE SIZE OF CPMLDR.BIN CHANGES, SYS_END MUST BE UPDATED!!!
+;
 SYS_ENT		.EQU	$0100		; SYSTEM (OS) ENTRY POINT ADDRESS
 SYS_LOC		.EQU	$0100		; STARTING ADDRESS TO LOAD SYSTEM IMAGE
-SYS_END		.EQU	$1480		; ENDING ADDRESS OF SYSTEM IMAGE
+SYS_END		.EQU	$1580 + SYS_LOC	; ENDING ADDRESS OF SYSTEM IMAGE
 ;
 SEC_SIZE	.EQU	512		; DISK SECTOR SIZE
 BLK_SIZE	.EQU	128		; OS BLOCK/RECORD SIZE
diff --git a/Source/ver.inc b/Source/ver.inc
index 86655b37..3cc80df6 100644
--- a/Source/ver.inc
+++ b/Source/ver.inc
@@ -2,4 +2,4 @@
 #DEFINE	RMN	1
 #DEFINE	RUP	1
 #DEFINE	RTP	0
-#DEFINE BIOSVER	"3.1.1-pre.7"
+#DEFINE BIOSVER	"3.1.1-pre.8"
diff --git a/Source/ver.lib b/Source/ver.lib
index ee5204d5..2f03066f 100644
--- 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.7"
+	db	"3.1.1-pre.8"
 	endm