Improve Centronics Compatibility

- Renamed Centronics driver from "CEN" to "LPT" based on input that LPT is the more recognized name for IBM compatible Centronics interfaces. - Modified LPT hardware detection to be more generic (no longer depends on MBC-specific hardware implementation). - Fix to CPU speed display for SBC v2 (004 and above) speed selection mechanism.
Correct AY38910 Off By 1 Octave Issue
2026-02-06 22:43:15 -06:00 · 2022-06-26 14:25:32 -07:00 · 2022-06-20 20:07:06 -07:00 · 2022-06-17 11:13:11 -07:00 · 2022-06-17 10:25:48 -07:00 · 2022-06-17 10:21:29 -07:00
31 changed files with 570 additions and 276 deletions
--- a/Source/Apps/assign.asm
+++ b/Source/Apps/assign.asm
@@ -244,7 +244,7 @@ initcpm3:
 ; The CP/M 3 drvtbl is in common memory, but the XDPHs are not.
 ; So, here we temporarily swap the bank to the CP/M 3 system
 ; bank.  We cannot use the CP/M Direct BIOS call because it
-; explicitly blocks use of SELMEM, so we are foreced to use
+; explicitly blocks use of SELMEM, so we are forced to use
 ; HBIOS call.  The CP/M 3 system bank is always the HBIOS
 ; user bank.
 ;
--- a/Source/Doc/Architecture.md
+++ b/Source/Doc/Architecture.md
@@ -1399,7 +1399,7 @@ 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 sound chip resolution and its oscillator limit the range and
-accuracy of the notes played. The typically range of the AY-3-8910
+accuracy of the notes played. The typical range of the AY-3-8910
 is six octaves, Bb2/A#2-A7, where each value is a unique tone. Values
 above and below can still be played but each quarter tone step may not
 result in a note change.
@@ -1409,18 +1409,18 @@ to the corresponding octave and note.

 | Note  | Oct 0 | Oct 1 | Oct 2 | Oct 3 | Oct 4 | Oct 5 | Oct 6 | Oct 7 |
 |:----- | -----:| -----:| -----:| -----:| -----:| -----:| -----:| -----:|
-| Bb/A# |   0   |   48  |  96   |  144  |  192  |  240  |  288  |  336  |
+| C     |   X   |   8   |   56  |  104  |  152  |  200  |  248  |  296  |
+| C#/Db |   X   |   12  |   60  |  108  |  156  |  204  |  252  |  300  |
+| D     |   X   |   16  |   64  |  112  |  160  |  208  |  256  |  304  |
+| D#/Eb |   X   |   20  |   68  |  116  |  164  |  212  |  260  |  308  |
+| E     |   X   |   24  |   72  |  120  |  168  |  216  |  264  |  312  |
+| F     |   X   |   28  |   76  |  124  |  172  |  220  |  268  |  316  |
+| F#/Gb |   X   |   32  |   80  |  128  |  176  |  224  |  272  |  320  |
+| G     |   X   |   36  |   84  |  132  |  180  |  228  |  276  |  324  |
+| G#/Ab |   X   |   40  |   88  |  136  |  184  |  232  |  280  |  328  |
+| A     |   X   |   44  |   92  |  140  |  188  |  236  |  284  |  332  |
+| A#/Bb |   0   |   48  |   96  |  144  |  192  |  240  |  288  |  336  |
 | B     |   4   |   52  |  100  |  148  |  196  |  244  |  292  |  340  |
-| C     |   8   |   56  |  104  |  152  |  200  |  248  |  296  |  344  |
-| C#/Db |   12  |   60  |  108  |  156  |  204  |  252  |  300  |  348  |
-| D     |   16  |   64  |  112  |  160  |  208  |  256  |  304  |  352  |
-| Eb/D# |   20  |   68  |  116  |  164  |  212  |  260  |  308  |  356  |
-| E     |   24  |   72  |  120  |  168  |  216  |  264  |  312  |  360  |
-| F     |   28  |   76  |  124  |  172  |  220  |  268  |  316  |  364  |
-| F#/Gb |   32  |   80  |  128  |  176  |  224  |  272  |  320  |  368  |
-| G     |   36  |   84  |  132  |  180  |  228  |  276  |  324  |  372  |
-| Ab/G# |   40  |   88  |  136  |  184  |  232  |  280  |  328  |  376  |
-| A     |   44  |   92  |  140  |  188  |  236  |  284  |  332  |  380  |

 ### Function 0x54 -- Sound Play (SNDPLAY)

--- a/Source/HBIOS/ay38910.asm
+++ b/Source/HBIOS/ay38910.asm
@@ -327,7 +327,8 @@ AY_NOTE:
 	LD	H, (HL)			; SO WE CAN UPDATE IT FOR THE REQUIRED OCTAVE
 	LD	L, A
 ;
-	LD	A,AY_SCALE-1		; THE NOTE TABLE PERIOD DATA HAS BEEN
+	;LD	A,AY_SCALE - 1		; THE NOTE TABLE PERIOD DATA HAS BEEN
+	LD	A,AY_SCALE		; THE NOTE TABLE PERIOD DATA HAS BEEN
 	ADD	A,C			; PRESCALED TO MAINTAIN RANGE SO ALLOW
 	LD	B,A			; FOR THIS WHEN CHANGING OCTAVE
 AY_NOTE1:
@@ -534,7 +535,7 @@ AY_EI:
 AY_WRTPSG:
 	CALL	AY_DI
 #IFDEF SBCV2004
-	LD	A,(RTCVAL)		; GET CURRENT RTC LATCH VALUE
+	LD	A,(HB_RTCVAL)		; GET CURRENT RTC LATCH VALUE
 	OR	%00001000		; SBC-V2-004 CHANGE
 	OUT	(RTCIO),A		; TO HALF CLOCK SPEED
 #ENDIF
@@ -553,7 +554,7 @@ AY_WRTPSG:
 	OUT0	(Z180_DCNTL),A		; AND RESTORE IT
 #ENDIF
 #IFDEF SBCV2004
-	LD	A,(RTCVAL)		; SBC-V2-004 CHANGE TO
+	LD	A,(HB_RTCVAL)		; SBC-V2-004 CHANGE TO
 	OUT	(RTCIO),A		; NORMAL CLOCK SPEED
 #ENDIF
 	JP	AY_EI
@@ -565,7 +566,7 @@ AY_WRTPSG:
 AY_RDPSG:
 	CALL	AY_DI
 #IFDEF SBCV2004
-	LD	A,(RTCVAL)		; GET CURRENT RTC LATCH VALUE
+	LD	A,(HB_RTCVAL)		; GET CURRENT RTC LATCH VALUE
 	OR	%00001000		; SBC-V2-004 CHANGE
 	OUT	(RTCIO),A		; TO HALF CLOCK SPEED
 #ENDIF
@@ -584,7 +585,7 @@ AY_RDPSG:
 	OUT0	(Z180_DCNTL),A		; AND RESTORE IT
 #ENDIF
 #IFDEF SBCV2004
-	LD	A,(RTCVAL)		; SBC-V2-004 CHANGE TO
+	LD	A,(HB_RTCVAL)		; SBC-V2-004 CHANGE TO
 	OUT	(RTCIO),A		; NORMAL CLOCK SPEED
 #ENDIF
 	JP	AY_EI
@@ -617,51 +618,51 @@ AYT_REGWR		.DB	"\r\nOUT AY-3-8910 $"
 ; ASSUMING A CLOCK OF 1843200 THIS MAPS TO A0#
 ;
 AY3NOTETBL:
-	.DW	AY_RATIO / 2913
-	.DW	AY_RATIO / 2956
-	.DW	AY_RATIO / 2999
-	.DW	AY_RATIO / 3042
-	.DW	AY_RATIO / 3086
-	.DW	AY_RATIO / 3131
-	.DW	AY_RATIO / 3177
-	.DW	AY_RATIO / 3223
-	.DW	AY_RATIO / 3270
-	.DW	AY_RATIO / 3318
-	.DW	AY_RATIO / 3366
-	.DW	AY_RATIO / 3415
-	.DW	AY_RATIO / 3464
-	.DW	AY_RATIO / 3515
-	.DW	AY_RATIO / 3566
-	.DW	AY_RATIO / 3618
-	.DW	AY_RATIO / 3670
-	.DW	AY_RATIO / 3724
-	.DW	AY_RATIO / 3778
-	.DW	AY_RATIO / 3833
-	.DW	AY_RATIO / 3889
-	.DW	AY_RATIO / 3945
-	.DW	AY_RATIO / 4003
-	.DW	AY_RATIO / 4061
-	.DW	AY_RATIO / 4120
-	.DW	AY_RATIO / 4180
-	.DW	AY_RATIO / 4241
-	.DW	AY_RATIO / 4302
-	.DW	AY_RATIO / 4365
-	.DW	AY_RATIO / 4428
-	.DW	AY_RATIO / 4493
-	.DW	AY_RATIO / 4558
-	.DW	AY_RATIO / 4624
-	.DW	AY_RATIO / 4692
-	.DW	AY_RATIO / 4760
-	.DW	AY_RATIO / 4829
-	.DW	AY_RATIO / 4899
-	.DW	AY_RATIO / 4971
-	.DW	AY_RATIO / 5043
-	.DW	AY_RATIO / 5116
-	.DW	AY_RATIO / 5191
-	.DW	AY_RATIO / 5266
-	.DW	AY_RATIO / 5343
-	.DW	AY_RATIO / 5421
-	.DW	AY_RATIO / 5499
-	.DW	AY_RATIO / 5579
-	.DW	AY_RATIO / 5661
-	.DW	AY_RATIO / 5743
+	.DW	AY_RATIO / 2913		; A0#/B0b	178977250 / 2913 = 61440; PROOF: 61440 >> 3 = 7680, 3579545 / 7680 / 16 = 29.13
+	.DW	AY_RATIO / 2956		;
+	.DW	AY_RATIO / 2999		;
+	.DW	AY_RATIO / 3042		;
+	.DW	AY_RATIO / 3086		; B0
+	.DW	AY_RATIO / 3131		; 
+	.DW	AY_RATIO / 3177		; 
+	.DW	AY_RATIO / 3223		; 
+	.DW	AY_RATIO / 3270		; C1
+	.DW	AY_RATIO / 3318		; 
+	.DW	AY_RATIO / 3366		; 
+	.DW	AY_RATIO / 3415		; 
+	.DW	AY_RATIO / 3464		; C1#/D1b
+	.DW	AY_RATIO / 3515		; 
+	.DW	AY_RATIO / 3566		; 
+	.DW	AY_RATIO / 3618		; 
+	.DW	AY_RATIO / 3670		; D1
+	.DW	AY_RATIO / 3724		; 
+	.DW	AY_RATIO / 3778		; 
+	.DW	AY_RATIO / 3833		; 
+	.DW	AY_RATIO / 3889		; D1#/E1b
+	.DW	AY_RATIO / 3945		; 
+	.DW	AY_RATIO / 4003		; 
+	.DW	AY_RATIO / 4061		; 
+	.DW	AY_RATIO / 4120		; E1
+	.DW	AY_RATIO / 4180		; 
+	.DW	AY_RATIO / 4241		; 
+	.DW	AY_RATIO / 4302		; 
+	.DW	AY_RATIO / 4365		; F1
+	.DW	AY_RATIO / 4428		; 
+	.DW	AY_RATIO / 4493		; 
+	.DW	AY_RATIO / 4558		; 
+	.DW	AY_RATIO / 4624		; F1#/G1b
+	.DW	AY_RATIO / 4692		; 
+	.DW	AY_RATIO / 4760		; 
+	.DW	AY_RATIO / 4829		; 
+	.DW	AY_RATIO / 4899		; G1
+	.DW	AY_RATIO / 4971		; 
+	.DW	AY_RATIO / 5043		; 
+	.DW	AY_RATIO / 5116		; 
+	.DW	AY_RATIO / 5191		; G1#/A1b
+	.DW	AY_RATIO / 5266		; 
+	.DW	AY_RATIO / 5343		; 
+	.DW	AY_RATIO / 5421		; 
+	.DW	AY_RATIO / 5499		; A1
+	.DW	AY_RATIO / 5579		; 
+	.DW	AY_RATIO / 5661		; 
+	.DW	AY_RATIO / 5743		; 
--- a/Source/HBIOS/cfg_dyno.asm
+++ b/Source/HBIOS/cfg_dyno.asm
@@ -183,7 +183,7 @@ HDSKENABLE	.EQU	FALSE		; HDSK: ENABLE SIMH HDSK DISK DRIVER (HDSK.ASM)
 ;
 PIOENABLE	.EQU	FALSE		; PIO: ENABLE ZILOG PIO DRIVER (PIO.ASM)
 ;
-CENENABLE	.EQU	FALSE		; CEN: ENABLE CENTRONICS DRIVER (CEN.ASM)
+LPTENABLE	.EQU	FALSE		; LPT: ENABLE CENTRONICS PRINTER DRIVER (LPT.ASM)
 ;
 PIO_4P		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB 4P BOARD
 PIO_ZP		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB ZILOG PERIPHERALS BOARD (PIO.ASM)
--- a/Source/HBIOS/cfg_ezz80.asm
+++ b/Source/HBIOS/cfg_ezz80.asm
@@ -224,7 +224,7 @@ HDSKENABLE	.EQU	FALSE		; HDSK: ENABLE SIMH HDSK DISK DRIVER (HDSK.ASM)
 ;
 PIOENABLE	.EQU	FALSE		; PIO: ENABLE ZILOG PIO DRIVER (PIO.ASM)
 ;
-CENENABLE	.EQU	FALSE		; CEN: ENABLE CENTRONICS DRIVER (CEN.ASM)
+LPTENABLE	.EQU	FALSE		; LPT: ENABLE CENTRONICS PRINTER DRIVER (LPT.ASM)
 ;
 PIO_4P		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB 4P BOARD
 PIO_ZP		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB ZILOG PERIPHERALS BOARD (PIO.ASM)
--- a/Source/HBIOS/cfg_master.asm
+++ b/Source/HBIOS/cfg_master.asm
@@ -300,10 +300,10 @@ PIOCNT		.EQU	2		; PIO: NUMBER OF CHIPS TO DETECT (1-2), 2 CHANNELS PER CHIP
 PIO0BASE	.EQU	$B8		; PIO 0: REGISTERS BASE ADR
 PIO1BASE	.EQU	$BC		; PIO 1: REGISTERS BASE ADR
 ;
-CENENABLE	.EQU	FALSE		; CEN: ENABLE CENTRONICS DRIVER (CEN.ASM)
-CENCNT		.EQU	1		; CEN: NUMBER OF CHIPS TO DETECT (1-2)
-CEN0BASE	.EQU	$E8		; CEN 0: REGISTERS BASE ADR
-CEN1BASE	.EQU	$EC		; CEN 1: REGISTERS BASE ADR
+LPTENABLE	.EQU	FALSE		; LPT: ENABLE CENTRONICS PRINTER DRIVER (LPT.ASM)
+LPTCNT		.EQU	1		; LPT: NUMBER OF CHIPS TO DETECT (1-2)
+LPT0BASE	.EQU	$E8		; LPT 0: REGISTERS BASE ADR
+LPT1BASE	.EQU	$EC		; LPT 1: REGISTERS BASE ADR
 ;
 PIO_4P		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB 4P BOARD
 PIO4BASE	.EQU	$90		; PIO: PIO REGISTERS BASE ADR FOR ECB 4P BOARD
--- a/Source/HBIOS/cfg_mbc.asm
+++ b/Source/HBIOS/cfg_mbc.asm
@@ -224,10 +224,10 @@ PIOCNT		.EQU	2		; PIO: NUMBER OF CHIPS TO DETECT (1-2), 2 CHANNELS PER CHIP
 PIO0BASE	.EQU	$B8		; PIO 0: REGISTERS BASE ADR
 PIO1BASE	.EQU	$BC		; PIO 1: REGISTERS BASE ADR
 ;
-CENENABLE	.EQU	TRUE		; CEN: ENABLE CENTRONICS DRIVER (CEN.ASM)
-CENCNT		.EQU	1		; CEN: NUMBER OF CHIPS TO DETECT (1-2)
-CEN0BASE	.EQU	$E8		; CEN 0: REGISTERS BASE ADR
-CEN1BASE	.EQU	$EC		; CEN 1: REGISTERS BASE ADR
+LPTENABLE	.EQU	TRUE		; LPT: ENABLE CENTRONICS PRINTER DRIVER (LPT.ASM)
+LPTCNT		.EQU	1		; LPT: NUMBER OF CHIPS TO DETECT (1-2)
+LPT0BASE	.EQU	$E8		; LPT 0: REGISTERS BASE ADR
+LPT1BASE	.EQU	$EC		; LPT 1: REGISTERS BASE ADR
 ;
 PIO_4P		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB 4P BOARD
 PIO4BASE	.EQU	$90		; PIO: PIO REGISTERS BASE ADR FOR ECB 4P BOARD
--- a/Source/HBIOS/cfg_mk4.asm
+++ b/Source/HBIOS/cfg_mk4.asm
@@ -226,7 +226,7 @@ PIOCNT		.EQU	2		; PIO: NUMBER OF CHIPS TO DETECT (1-2), 2 CHANNELS PER CHIP
 PIO0BASE	.EQU	$B8		; PIO 0: REGISTERS BASE ADR
 PIO1BASE	.EQU	$BC		; PIO 1: REGISTERS BASE ADR
 ;
-CENENABLE	.EQU	FALSE		; CEN: ENABLE CENTRONICS DRIVER (CEN.ASM)
+LPTENABLE	.EQU	FALSE		; LPT: ENABLE CENTRONICS PRINTER DRIVER (LPT.ASM)
 ;
 PIO_4P		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB 4P BOARD
 PIO4BASE	.EQU	$90		; PIO: PIO REGISTERS BASE ADR FOR ECB 4P BOARD
--- a/Source/HBIOS/cfg_n8.asm
+++ b/Source/HBIOS/cfg_n8.asm
@@ -224,7 +224,7 @@ PIOCNT		.EQU	2		; PIO: NUMBER OF CHIPS TO DETECT (1-2), 2 CHANNELS PER CHIP
 PIO0BASE	.EQU	$B8		; PIO 0: REGISTERS BASE ADR
 PIO1BASE	.EQU	$BC		; PIO 1: REGISTERS BASE ADR
 ;
-CENENABLE	.EQU	FALSE		; CEN: ENABLE CENTRONICS DRIVER (CEN.ASM)
+LPTENABLE	.EQU	FALSE		; LPT: ENABLE CENTRONICS PRINTER DRIVER (LPT.ASM)
 ;
 PIO_4P		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB 4P BOARD
 PIO4BASE	.EQU	$90		; PIO: PIO REGISTERS BASE ADR FOR ECB 4P BOARD
--- a/Source/HBIOS/cfg_rcz180.asm
+++ b/Source/HBIOS/cfg_rcz180.asm
@@ -240,7 +240,7 @@ PIOCNT		.EQU	2		; PIO: NUMBER OF CHIPS TO DETECT (1-2), 2 CHANNELS PER CHIP
 PIO0BASE	.EQU	$B8		; PIO 0: REGISTERS BASE ADR
 PIO1BASE	.EQU	$BC		; PIO 1: REGISTERS BASE ADR
 ;
-CENENABLE	.EQU	FALSE		; CEN: ENABLE CENTRONICS DRIVER (CEN.ASM)
+LPTENABLE	.EQU	FALSE		; LPT: ENABLE CENTRONICS PRINTER DRIVER (LPT.ASM)
 ;
 PIO_4P		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB 4P BOARD
 PIO_ZP		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB ZILOG PERIPHERALS BOARD (PIO.ASM)
--- a/Source/HBIOS/cfg_rcz280.asm
+++ b/Source/HBIOS/cfg_rcz280.asm
@@ -255,7 +255,7 @@ PIOCNT		.EQU	2		; PIO: NUMBER OF CHIPS TO DETECT (1-2), 2 CHANNELS PER CHIP
 PIO0BASE	.EQU	$B8		; PIO 0: REGISTERS BASE ADR
 PIO1BASE	.EQU	$BC		; PIO 1: REGISTERS BASE ADR
 ;
-CENENABLE	.EQU	FALSE		; CEN: ENABLE CENTRONICS DRIVER (CEN.ASM)
+LPTENABLE	.EQU	FALSE		; LPT: ENABLE CENTRONICS PRINTER DRIVER (LPT.ASM)
 ;
 PIO_4P		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB 4P BOARD
 PIO_ZP		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB ZILOG PERIPHERALS BOARD (PIO.ASM)
--- a/Source/HBIOS/cfg_rcz80.asm
+++ b/Source/HBIOS/cfg_rcz80.asm
@@ -244,7 +244,7 @@ PIOCNT		.EQU	2		; PIO: NUMBER OF CHIPS TO DETECT (1-2), 2 CHANNELS PER CHIP
 PIO0BASE	.EQU	$B8		; PIO 0: REGISTERS BASE ADR
 PIO1BASE	.EQU	$BC		; PIO 1: REGISTERS BASE ADR
 ;
-CENENABLE	.EQU	FALSE		; CEN: ENABLE CENTRONICS DRIVER (CEN.ASM)
+LPTENABLE	.EQU	FALSE		; LPT: ENABLE CENTRONICS PRINTER DRIVER (LPT.ASM)
 ;
 PIO_4P		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB 4P BOARD
 PIO_ZP		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB ZILOG PERIPHERALS BOARD (PIO.ASM)
--- a/Source/HBIOS/cfg_rph.asm
+++ b/Source/HBIOS/cfg_rph.asm
@@ -224,7 +224,7 @@ PIOCNT		.EQU	2		; PIO: NUMBER OF CHIPS TO DETECT (1-2), 2 CHANNELS PER CHIP
 PIO0BASE	.EQU	$B8		; PIO 0: REGISTERS BASE ADR
 PIO1BASE	.EQU	$BC		; PIO 1: REGISTERS BASE ADR
 ;
-CENENABLE	.EQU	FALSE		; CEN: ENABLE CENTRONICS DRIVER (CEN.ASM)
+LPTENABLE	.EQU	FALSE		; LPT: ENABLE CENTRONICS PRINTER DRIVER (LPT.ASM)
 ;
 PIO_4P		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB 4P BOARD
 PIO4BASE	.EQU	$90		; PIO: PIO REGISTERS BASE ADR FOR ECB 4P BOARD
--- a/Source/HBIOS/cfg_sbc.asm
+++ b/Source/HBIOS/cfg_sbc.asm
@@ -224,7 +224,7 @@ PIOCNT		.EQU	2		; PIO: NUMBER OF CHIPS TO DETECT (1-2), 2 CHANNELS PER CHIP
 PIO0BASE	.EQU	$B8		; PIO 0: REGISTERS BASE ADR
 PIO1BASE	.EQU	$BC		; PIO 1: REGISTERS BASE ADR
 ;
-CENENABLE	.EQU	FALSE		; CEN: ENABLE CENTRONICS DRIVER (CEN.ASM)
+LPTENABLE	.EQU	FALSE		; LPT: ENABLE CENTRONICS PRINTER DRIVER (LPT.ASM)
 ;
 PIO_4P		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB 4P BOARD
 PIO4BASE	.EQU	$90		; PIO: PIO REGISTERS BASE ADR FOR ECB 4P BOARD
--- a/Source/HBIOS/cfg_scz180.asm
+++ b/Source/HBIOS/cfg_scz180.asm
@@ -230,13 +230,13 @@ PPPENABLE	.EQU	FALSE		; PPP: ENABLE ZETA PARALLEL PORT PROPELLER BOARD DRIVER (P
 ;
 HDSKENABLE	.EQU	FALSE		; HDSK: ENABLE SIMH HDSK DISK DRIVER (HDSK.ASM)
 ;
-CENENABLE	.EQU	FALSE		; CEN: ENABLE CENTRONICS DRIVER (CEN.ASM)
-;
 PIOENABLE	.EQU	FALSE		; PIO: ENABLE ZILOG PIO DRIVER (PIO.ASM)
 PIOCNT		.EQU	2		; PIO: NUMBER OF CHIPS TO DETECT (1-2), 2 CHANNELS PER CHIP
 PIO0BASE	.EQU	$B8		; PIO 0: REGISTERS BASE ADR
 PIO1BASE	.EQU	$BC		; PIO 1: REGISTERS BASE ADR
 ;
+LPTENABLE	.EQU	FALSE		; LPT: ENABLE CENTRONICS PRINTER DRIVER (LPT.ASM)
+;
 PIO_4P		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB 4P BOARD
 PIO_ZP		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB ZILOG PERIPHERALS BOARD (PIO.ASM)
 PIO_SBC		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR 8255 CHIP
--- a/Source/HBIOS/cfg_zeta.asm
+++ b/Source/HBIOS/cfg_zeta.asm
@@ -164,11 +164,8 @@ PPPCONENABLE	.EQU	TRUE		; PPP: ENABLE PPP DRIVER VIDEO/KBD SUPPORT
 HDSKENABLE	.EQU	FALSE		; HDSK: ENABLE SIMH HDSK DISK DRIVER (HDSK.ASM)
 ;
 PIOENABLE	.EQU	FALSE		; PIO: ENABLE ZILOG PIO DRIVER (PIO.ASM)
-PIOCNT		.EQU	2		; PIO: NUMBER OF CHIPS TO DETECT (1-2), 2 CHANNELS PER CHIP
-PIO0BASE	.EQU	$B8		; PIO 0: REGISTERS BASE ADR
-PIO1BASE	.EQU	$BC		; PIO 1: REGISTERS BASE ADR
 ;
-CENENABLE	.EQU	FALSE		; CEN: ENABLE CENTRONICS DRIVER (CEN.ASM)
+LPTENABLE	.EQU	FALSE		; LPT: ENABLE CENTRONICS PRINTER DRIVER (LPT.ASM)
 ;
 PIO_4P		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB 4P BOARD
 PIO_ZP		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB ZILOG PERIPHERALS BOARD (PIO.ASM)
--- a/Source/HBIOS/cfg_zeta2.asm
+++ b/Source/HBIOS/cfg_zeta2.asm
@@ -176,7 +176,7 @@ HDSKENABLE	.EQU	FALSE		; HDSK: ENABLE SIMH HDSK DISK DRIVER (HDSK.ASM)
 ;
 PIOENABLE	.EQU	FALSE		; PIO: ENABLE ZILOG PIO DRIVER (PIO.ASM)
 ;
-CENENABLE	.EQU	FALSE		; CEN: ENABLE CENTRONICS DRIVER (CEN.ASM)
+LPTENABLE	.EQU	FALSE		; LPT: ENABLE CENTRONICS PRINTER DRIVER (LPT.ASM)
 ;
 PIO_4P		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB 4P BOARD
 PIO_ZP		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB ZILOG PERIPHERALS BOARD (PIO.ASM)
--- a/Source/HBIOS/dbgmon.asm
+++ b/Source/HBIOS/dbgmon.asm
@@ -38,6 +38,8 @@ ENA_XM	.EQU	FALSE			; NO ROOM FOR BOTH DSKY+XMODEM
 ENA_XM	.EQU	TRUE			; INCLUDE XMODEM IF SPACE AVAILABLE
 #ENDIF
 ;
+ENA_MBC6502	.EQU	FALSE		; ENABLE OR DISABLE MBC6502 OPTION
+;
 #INCLUDE "util.asm"
 ;
 ;__UART_ENTRY_________________________________________________________________
@@ -69,6 +71,8 @@ UART_ENTRY:
 ; R XXXX		- RUN A PROGRAM AT ADDRESS XXXX
 ; S XX			- SET ACTIVE BANK TO XX
 ; T XXXX 		- X-MODEM TRANSFER TO MEMORY LOCATION XXXX
+; U 			- SET BANK TO PREVIOUS BANK
+; 6 XX                  - TRANSFER CONTROL TO MBC6502 UNIT XX
 ; X			- EXIT MONITOR
 ;
 ;__COMMAND_PARSE______________________________________________________________
@@ -126,6 +130,12 @@ SERIALCMDLOOP:
 #IF (BIOS == BIOS_WBW)
 	CP	'S'			; IS IT A "S" (Y/N)
 	JP	Z,SETBNK		; SET BANK COMMAND
+	CP	'U'			; IS IT A "U" (Y/N)
+	JP	Z,UNSETBNK		; UNSET (REVERT) BANK COMMAND		
+  #IF ((PLATFORM = PLT_MBC) & ENA_MBC6502)
+	CP	'6'			; IS IT A "6" (Y/N)
+	JP	Z,MBC6502		; TRANSFER TO MBC6502 COMMAND
+  #ENDIF
 #ENDIF
 	CP	'X'			; IS IT A "X" (Y/N)
 	JP	Z,EXIT			; EXIT COMMAND
@@ -218,6 +228,8 @@ SETBNK:
 	LD	HL,TXT_IMERR
 	CALL	PRTSTR
 #ELSE
+	LD	A,($FFE0)		; GET AND SAVE
+	LD	(BNKSAV),A		; CURRENT BANK
 	CALL	BYTEPARM		; GET BANK NUMBER
 	JP	C,ERR			; HANDLE DATA ENTRY ERROR
 	LD	C,A			; PUT IN C FOR FOR FUNC CALL
@@ -226,6 +238,25 @@ SETBNK:
 #ENDIF
 	JP	SERIALCMDLOOP		; NEXT COMMAND
 ;
+;__UNSETBNK___________________________________________________________________
+;
+;	PERFORM UNSET BANK ACTION - REVERT TO BANK BEFORE PREVIOUS SET
+;_____________________________________________________________________________
+;
+UNSETBNK:
+#IF (INTMODE == 1)
+	LD	HL,TXT_IMERR
+	CALL	PRTSTR
+#ELSE
+	LD	A,(BNKSAV)
+	LD	C,A			; PUT IN C FOR FOR FUNC CALL
+	LD	B,BF_SYSSETBNK		; SET BANK FUNCTION
+	CALL	$FFF0			; C HAS BANK, DO IT
+#ENDIF
+	JP	SERIALCMDLOOP		; NEXT COMMAND
+;
+BNKSAV	.DB	00H			; OLD BANK FROM BEFORE SET
+;
 #ENDIF
 ;
 ;__RUN________________________________________________________________________
@@ -358,7 +389,8 @@ XMLOAD:	CALL	WORDPARM		; GET STARTING LOCATION
 	CALL	NEWLINE
 ;
 	LD	BC,$F8F0		; GET CPU SPEED
-	RST	08			; AND MULTIPLY
+	CALL	$FFF0			; CALL HBIOS
+;	RST	08			; AND MULTIPLY
 	LD	A,L			; BY 4
 	PUSH	AF
 	ADD	A,A			; TO CREATE
@@ -769,6 +801,30 @@ HELP:
 	CALL	PRTSTR			; DISPLAY IT
 	JP	SERIALCMDLOOP		; AND BACK TO COMMAND LOOP
 ;
+;__MBC6502____________________________________________________________________
+;
+;	TRANSFER CONTROL TO MBC6502
+;_____________________________________________________________________________
+;
+;
+#IF (BIOS == BIOS_WBW)
+  #IF ((PLATFORM = PLT_MBC) & ENA_MBC6502)
+MBC6502:
+	CALL	BYTEPARM		; GET BYTE VALUE (FILL VALUE) INTO A
+	CPL				; UNIT 0 = FFH, 1 = FEH ETC
+	LD	C,A
+;
+	IN	A,(C)			; EXECUTE
+	NOP				; TRANSFER
+;
+	LD	A,($FFE0)		; GET PREVIOUS BANK
+	OUT	(MPCL_RAM),A		; SET RAM PAGE SELECTOR
+	OUT	(MPCL_ROM),A		; SET ROM PAGE SELECTOR
+;
+	JP	SERIALCMDLOOP		; AND BACK TO COMMAND LOOP
+  #ENDIF
+#ENDIF
+;
 ;__ERR________________________________________________________________________
 ;
 ;	SYNTAX ERROR
@@ -1205,9 +1261,17 @@ TXT_HELP	.TEXT	"\r\nMonitor Commands (all values in hex):"
 		.TEXT	"\r\nP xxxx           - Program RAM at address xxxx"
 		.TEXT	"\r\nR xxxx [[yy] [zzzz]]  - Run code at address xxxx"
 		.TEXT	"\r\n                        Pass yy and zzzz to register A and BC"
+#IF (BIOS == BIOS_WBW)
 		.TEXT	"\r\nS xx             - Set bank to xx"
+		.TEXT	"\r\nU                - Set bank to previous bank"
+#ENDIF
 #IF (ENA_XM)
 		.TEXT	"\r\nT xxxx           - X-modem transfer to memory location xxxx"
+#ENDIF
+#IF (BIOS == BIOS_WBW)
+  #IF ((PLATFORM == PLT_MBC) & ENA_MBC6502)
+		.TEXT	"\r\n6 xx             - Transfer control to MBC6502 unit xx"
+  #ENDIF
 #ENDIF
 		.TEXT	"\r\nX                - Exit monitor"
 		.TEXT	"$"
--- a/Source/HBIOS/hbios.asm
+++ b/Source/HBIOS/hbios.asm
@@ -2299,6 +2299,18 @@ NXTMIO:	LD	A,(HL)
 	CALL	PRTSTRD
 	.TEXT	"HBIOS MUTEX ENABLED$"
 #ENDIF
+;
+; DISPLAY RECOVERY MODE MESSAGE
+;
+#IF (BT_REC_TYPE != BT_REC_NONE)
+	LD	A,(HB_BOOT_REC)		; IF WE ARE IN RECOVERY MODE
+	OR	A			; DISPLAY RECOVERY MODE MESSAGE
+	JR	Z,NOT_REC_M2
+	CALL	NEWLINE
+	CALL	PRTSTRD
+	.TEXT	"RECOVERY MODE$"
+#ENDIF
+NOT_REC_M2:
 ;
 	DIAG(%11111111)
 ;
@@ -2814,6 +2826,45 @@ INITSYS4:
 	LDCTL	(C),HL
 #ENDIF
 ;
+#IFDEF TESTING
+;
+; ROUTINE TO BEEP THE DEAULT SOUND UNIT (NOT FINISHED)
+; NEED TO CHECK FOR EXISTENCE OF SOUND UNIT 0
+; NEED TO TEST AGAINST ALL SOUND DRIVERS
+; CAN SPEAKER DRIVER BE MODIFIED TO PLAY ARBITRARY DURATION?
+; WHICH CHANNEL SHOULD BE USED?  IS THERE A GOOD DEFAULT CHANNEL?
+;
+SNDUNIT	.EQU	0
+;
+HB_BEEP:
+	LD	B,$50			; SOUND RESET FUNCTION
+	LD	C,SNDUNIT		; SOUND UNIT NUMBER
+	CALL	SND_DISPATCH		; DO IT
+	LD	B,$51			; VOLUME
+	LD	C,SNDUNIT		; SOUND UNIT NUMBER
+	LD	L,$FF			; MAX
+	CALL	SND_DISPATCH		; DO IT
+	LD	B,$53			; SELECT NOTE
+	LD	C,SNDUNIT		; SOUND UNIT NUMBER
+	;LD	HL,0			; A0#
+	LD	HL,200			; C4
+	CALL	SND_DISPATCH		; DO IT
+	;LD	B,$56			; DURATION
+	;LD	C,SNDUNIT		; SOUND UNIT NUMBER
+	;LD	HL,500			; 1/2 SECOND
+	;CALL	SND_DISPATCH		; DO IT
+	LD	B,$54			; PLAY SOUND
+	LD	C,SNDUNIT		; SOUND UNIT NUMBER
+	LD	D,1			; CHANNEL 0
+	CALL	SND_DISPATCH		; DO IT
+	LD	DE,15625		; PLAY FOR 1/4 SECOND
+	CALL	VDELAY
+	LD	B,$50			; SOUND RESET FUNCTION
+	LD	C,SNDUNIT		; SOUND UNIT NUMBER
+	CALL	SND_DISPATCH		; DO IT
+;
+#ENDIF
+;
 #IFNDEF ROMBOOT
 ;
 	; COPY OS IMAGE: BID_USR:<IMG START> --> BID_USR:0
@@ -2919,8 +2970,8 @@ HB_PCINITTBL:
 #IF (PIOENABLE)
 	.DW	PIO_PREINIT
 #ENDIF
-#IF CENENABLE)
-	.DW	CEN_PREINIT
+#IF LPTENABLE)
+	.DW	LPT_PREINIT
 #ENDIF
 #IF (PIO_4P | PIO_ZP)
 	.DW	PIO_PREINIT
@@ -2974,6 +3025,18 @@ HB_INITTBL:
 #IF (ACIAENABLE)
 	.DW	ACIA_INIT
 #ENDIF
+#IF (PIOENABLE)
+	.DW	PIO_INIT
+#ENDIF
+#IF (LPTENABLE)
+	.DW	LPT_INIT
+#ENDIF
+#IF (PIO_4P | PIO_ZP)
+	.DW	PIO_INIT
+#ENDIF
+#IF (UFENABLE)
+	.DW	UF_INIT
+#ENDIF
 #IF (DSRTCENABLE)
 	.DW	DSRTC_INIT
 #ENDIF
@@ -3041,18 +3104,6 @@ HB_INITTBL:
 #IF (PPPENABLE)
 	.DW	PPP_INIT
 #ENDIF
-#IF (PIOENABLE)
-	.DW	PIO_INIT
-#ENDIF
-#IF (CENENABLE)
-	.DW	CEN_INIT
-#ENDIF
-#IF (PIO_4P | PIO_ZP)
-	.DW	PIO_INIT
-#ENDIF
-#IF (UFENABLE)
-	.DW	UF_INIT
-#ENDIF

 ;
 HB_INITTBLLEN	.EQU	(($ - HB_INITTBL) / 2)
@@ -3698,7 +3749,7 @@ SND_ADDENT:
 ;	WORD	UNIT SPECIFIC DATA (TYPICALLY A DEVICE INSTANCE DATA ADDRESS)
 ;
 SND_FNCNT	.EQU	8		; NUMBER OF SND FUNCS (FOR RANGE CHECK)
-SND_MAX		.EQU	3		; UP TO 2 UNITS
+SND_MAX		.EQU	4		; UP TO 3 UNITS
 SND_SIZ		.EQU	SND_MAX * 4	; EACH ENTRY IS 4 BYTES
 ;
 		.DB	SND_FNCNT	; SND FUNCTION COUNT (FOR RANGE CHECK)
@@ -4102,10 +4153,10 @@ SYS_GETCPUSPD:
 ;
 #IF (((PLATFORM == PLT_SBC) | (PLATFORM == PLT_MBC)) & (CPUSPDCAP==SPD_HILO))
 	LD	A,(HB_RTCVAL)
-	BIT	3,A
 #IF (PLATFORM == PLT_SBC)
 	XOR	%00001000		; SBC SPEED BIT IS INVERTED
 #ENDIF
+	BIT	3,A
 	LD	L,0			; ASSUME HALF SPEED
 	JR	Z,SYS_GETCPUSPD1
 	LD	L,1
@@ -5233,7 +5284,7 @@ HB_ADDENT:
 ; ALL OTHER REGISTERS PRESERVED
 ;
 ; A 4 BYTE HEADER IS PLACED IN FRONT OF THE ALLOCATED MEMORY
-;  - DWORD: SIZE OF MEMROY ALLOCATED (DOES NOT INCLUDE 4 BYTE HEADER)
+;  - DWORD: SIZE OF MEMORY ALLOCATED (DOES NOT INCLUDE 4 BYTE HEADER)
 ;  - DWORD: ADDRESS WHERE ALLOC WAS CALLED (VALUE ON TOP OF STACK AT CALL)
 ;
 HB_ALLOC:
@@ -5773,6 +5824,15 @@ SIZ_ASCI	.EQU	$ - ORG_ASCI
 		.ECHO	" bytes.\n"
 #ENDIF
 ;
+#IF (Z2UENABLE)
+ORG_Z2U	.EQU	$
+  #INCLUDE "z2u.asm"
+SIZ_Z2U	.EQU	$ - ORG_Z2U
+		.ECHO	"Z2U occupies "
+		.ECHO	SIZ_Z2U
+		.ECHO	" bytes.\n"
+#ENDIF
+;
 #IF (UARTENABLE)
 ORG_UART	.EQU	$
  #INCLUDE "uart.asm"
@@ -5809,12 +5869,39 @@ SIZ_ACIA	.EQU	$ - ORG_ACIA
 		.ECHO	" bytes.\n"
 #ENDIF
 ;
-#IF (Z2UENABLE)
-ORG_Z2U	.EQU	$
-  #INCLUDE "z2u.asm"
-SIZ_Z2U	.EQU	$ - ORG_Z2U
-		.ECHO	"Z2U occupies "
-		.ECHO	SIZ_Z2U
+#IF (PIOENABLE)
+ORG_PIO		.EQU	$
+  #INCLUDE "pio.asm"
+SIZ_PIO		.EQU	$ - ORG_PIO
+		.ECHO	"PIO occupies "
+		.ECHO	SIZ_PIO
+		.ECHO	" bytes.\n"
+#ENDIF
+;
+#IF (LPTENABLE)
+ORG_LPT		.EQU	$
+  #INCLUDE "lpt.asm"
+SIZ_LPT		.EQU	$ - ORG_LPT
+		.ECHO	"LPT occupies "
+		.ECHO	SIZ_LPT
+		.ECHO	" bytes.\n"
+#ENDIF
+;
+#IF (PIO_4P | PIO_ZP | PIO_SBC)
+ORG_PIO		.EQU	$
+  #INCLUDE "pio.asm"
+SIZ_PIO		.EQU	$ - ORG_PIO
+		.ECHO	"PIO occupies "
+		.ECHO	SIZ_PIO
+		.ECHO	" bytes.\n"
+#ENDIF
+;
+#IF (UFENABLE)
+ORG_UF	.EQU	$
+  #INCLUDE "uf.asm"
+SIZ_UF	.EQU	$ - ORG_UF
+		.ECHO	"UF occupies "
+		.ECHO	SIZ_UF
 		.ECHO	" bytes.\n"
 #ENDIF
 ;
@@ -6049,42 +6136,6 @@ SIZ_SPK	.EQU	$ - ORG_SPK
 		.ECHO	SIZ_SPK
 		.ECHO	" bytes.\n"
 #ENDIF
-;
-#IF (PIOENABLE)
-ORG_PIO		.EQU	$
-  #INCLUDE "pio.asm"
-SIZ_PIO		.EQU	$ - ORG_PIO
-		.ECHO	"PIO occupies "
-		.ECHO	SIZ_PIO
-		.ECHO	" bytes.\n"
-#ENDIF
-;
-#IF (CENENABLE)
-ORG_CEN		.EQU	$
-  #INCLUDE "cen.asm"
-SIZ_CEN		.EQU	$ - ORG_CEN
-		.ECHO	"CEN occupies "
-		.ECHO	SIZ_CEN
-		.ECHO	" bytes.\n"
-#ENDIF
-;
-#IF (PIO_4P | PIO_ZP | PIO_SBC)
-ORG_PIO		.EQU	$
-  #INCLUDE "pio.asm"
-SIZ_PIO		.EQU	$ - ORG_PIO
-		.ECHO	"PIO occupies "
-		.ECHO	SIZ_PIO
-		.ECHO	" bytes.\n"
-#ENDIF
-;
-#IF (UFENABLE)
-ORG_UF	.EQU	$
-  #INCLUDE "uf.asm"
-SIZ_UF	.EQU	$ - ORG_UF
-		.ECHO	"UF occupies "
-		.ECHO	SIZ_UF
-		.ECHO	" bytes.\n"
-#ENDIF
 #IF (KIOENABLE)
 ORG_KIO	.EQU	$
  #INCLUDE "kio.asm"
@@ -6909,7 +6960,7 @@ PS_FLP_DSTR:	.TEXT	"SD$"		; PS_FLPSD
 ;
 PS_SDSTRREF:
 	.DW	PS_SDUART, PS_SDASCI, PS_SDTERM, PS_SDPRPCON, PS_SDPPPCON
-	.DW	PS_SDSIO, PS_SDACIA, PS_SDPIO, PS_SDUF, PS_SDDUART, PS_SDZ2U, PS_SDCEN
+	.DW	PS_SDSIO, PS_SDACIA, PS_SDPIO, PS_SDUF, PS_SDDUART, PS_SDZ2U, PS_SDLPT
 ;
 PS_SDUART	.TEXT	"UART$"
 PS_SDASCI	.TEXT	"ASCI$"
@@ -6922,7 +6973,7 @@ PS_SDPIO	.TEXT	"PIO$"
 PS_SDUF		.TEXT	"UF$"
 PS_SDDUART	.TEXT	"DUART$"
 PS_SDZ2U	.TEXT	"Z2U$"
-PS_SDCEN	.TEXT	"CEN$"
+PS_SDLPT	.TEXT	"LPT$"
 ;
 ; CHARACTER SUB TYPE STRINGS
 ;
--- a/Source/HBIOS/hbios.inc
+++ b/Source/HBIOS/hbios.inc
@@ -183,7 +183,7 @@ CIODEV_PIO	.EQU	$70
 CIODEV_UF	.EQU	$80
 CIODEV_DUART	.EQU	$90
 CIODEV_Z2U	.EQU	$A0
-CIODEV_CEN	.EQU	$B0
+CIODEV_LPT	.EQU	$B0
 ;
 ; SUB TYPES OF CHAR DEVICES
 ;
--- a/Source/HBIOS/lpt.asm
+++ b/Source/HBIOS/lpt.asm
@@ -1,10 +1,10 @@
 ;
 ;==================================================================================================
-; CENTRONICS INTERFACE DRIVER
+; CENTRONICS (LPT) INTERFACE DRIVER
 ;==================================================================================================
 ;
-; CENTRONICS-STYLE PARALLEL PRINTER DRIVER.  ASSUMES MBC PRINT BOARD
-; AS HARDWARE.
+; CENTRONICS-STYLE PARALLEL PRINTER DRIVER.  ASSUMES IBM STYLE
+; HARDWARE INTERFACE AS DESCRIBED BELOW.
 ;
 ; IMPLEMENTED AS A ROMWBW CHARACTER DEVICE.  CURRENTLY HANDLES OUPUT
 ; ONLY.
@@ -30,56 +30,56 @@
 ;     | STAT1 | STAT0 | ENBL  | PINT  | SEL   | RES   | LF    | STB   |
 ;     +-------+-------+-------+-------+-------+-------+-------+-------+
 ;
-CEN_NONE	.EQU	0
-CEN_MBC		.EQU	1
+LPT_NONE	.EQU	0		; NOT PRESENT
+LPT_IBM		.EQU	1		; IBM PC STYLE INTERFACE
 ;
 ; PRE-CONSOLE INITIALIZATION - DETECT AND INIT HARDWARE
 ;
-CEN_PREINIT:
+LPT_PREINIT:
 ;
 ; SETUP THE DISPATCH TABLE ENTRIES
 ; NOTE: INTS WILL BE DISABLED WHEN PREINIT IS CALLED AND THEY MUST REMIAIN
 ; DISABLED.
 ;
-	LD	B,CEN_CFGCNT		; LOOP CONTROL
+	LD	B,LPT_CFGCNT		; LOOP CONTROL
 	XOR	A			; ZERO TO ACCUM
-	LD	(CEN_DEV),A		; CURRENT DEVICE NUMBER
-	LD	IY,CEN_CFG		; POINT TO START OF CFG TABLE
-CEN_PREINIT0:
+	LD	(LPT_DEV),A		; CURRENT DEVICE NUMBER
+	LD	IY,LPT_CFG		; POINT TO START OF CFG TABLE
+LPT_PREINIT0:
 	PUSH	BC			; SAVE LOOP CONTROL
-	CALL	CEN_INITUNIT		; HAND OFF TO UNIT INIT CODE
+	CALL	LPT_INITUNIT		; HAND OFF TO UNIT INIT CODE
 	POP	BC			; RESTORE LOOP CONTROL
 ;
-	LD	A,(IY+1)		; GET THE CEN TYPE DETECTED
+	LD	A,(IY+1)		; GET THE LPT TYPE DETECTED
 	OR	A			; SET FLAGS
-	JR	Z,CEN_PREINIT2		; SKIP IT IF NOTHING FOUND
+	JR	Z,LPT_PREINIT2		; SKIP IT IF NOTHING FOUND
 ;
 	PUSH	BC			; SAVE LOOP CONTROL
 	PUSH	IY			; CFG ENTRY ADDRESS
 	POP	DE			; ... TO DE
-	LD	BC,CEN_FNTBL		; BC := FUNCTION TABLE ADDRESS
-	CALL	NZ,CIO_ADDENT		; ADD ENTRY IF CEN FOUND, BC:DE
+	LD	BC,LPT_FNTBL		; BC := FUNCTION TABLE ADDRESS
+	CALL	NZ,CIO_ADDENT		; ADD ENTRY IF LPT FOUND, BC:DE
 	POP	BC			; RESTORE LOOP CONTROL
 ;
-CEN_PREINIT2:
-	LD	DE,CEN_CFGSIZ		; SIZE OF CFG ENTRY
+LPT_PREINIT2:
+	LD	DE,LPT_CFGSIZ		; SIZE OF CFG ENTRY
 	ADD	IY,DE			; BUMP IY TO NEXT ENTRY
-	DJNZ	CEN_PREINIT0		; LOOP UNTIL DONE
+	DJNZ	LPT_PREINIT0		; LOOP UNTIL DONE
 ;
-CEN_PREINIT3:
+LPT_PREINIT3:
 	XOR	A			; SIGNAL SUCCESS
 	RET				; AND RETURN
 ;
-; CEN INITIALIZATION ROUTINE
+; LPT INITIALIZATION ROUTINE
 ;
-CEN_INITUNIT:
-	CALL	CEN_DETECT		; DETERMINE CEN TYPE
+LPT_INITUNIT:
+	CALL	LPT_DETECT		; DETERMINE LPT TYPE
 	LD	(IY+1),A		; SAVE IN CONFIG TABLE
 	OR	A			; SET FLAGS
 	RET	Z			; ABORT IF NOTHING THERE
 ;
-	; UPDATE WORKING CEN DEVICE NUM
-	LD	HL,CEN_DEV		; POINT TO CURRENT DEVICE NUM
+	; UPDATE WORKING LPT DEVICE NUM
+	LD	HL,LPT_DEV		; POINT TO CURRENT DEVICE NUM
 	LD	A,(HL)			; PUT IN ACCUM
 	INC	(HL)			; INCREMENT IT (FOR NEXT LOOP)
 	LD	(IY),A			; UPDATE UNIT NUM
@@ -88,44 +88,44 @@ CEN_INITUNIT:
 	LD	DE,-1			; LEAVE CONFIG ALONE
 	; CALL INITDEV TO IMPLEMENT CONFIG, BUT NOTE THAT WE CALL
 	; THE INITDEV ENTRY POINT THAT DOES NOT ENABLE/DISABLE INTS!
-	JP	CEN_INITDEVX		; IMPLEMENT IT AND RETURN
+	JP	LPT_INITDEVX		; IMPLEMENT IT AND RETURN
 ;
 ;
 ;
-CEN_INIT:
-	LD	B,CEN_CFGCNT		; COUNT OF POSSIBLE CEN UNITS
-	LD	IY,CEN_CFG		; POINT TO START OF CFG TABLE
-CEN_INIT1:
+LPT_INIT:
+	LD	B,LPT_CFGCNT		; COUNT OF POSSIBLE LPT UNITS
+	LD	IY,LPT_CFG		; POINT TO START OF CFG TABLE
+LPT_INIT1:
 	PUSH	BC			; SAVE LOOP CONTROL
-	LD	A,(IY+1)		; GET CEN TYPE
+	LD	A,(IY+1)		; GET LPT TYPE
 	OR	A			; SET FLAGS
-	CALL	NZ,CEN_PRTCFG		; PRINT IF NOT ZERO
+	CALL	NZ,LPT_PRTCFG		; PRINT IF NOT ZERO
 	POP	BC			; RESTORE LOOP CONTROL
-	LD	DE,CEN_CFGSIZ		; SIZE OF CFG ENTRY
+	LD	DE,LPT_CFGSIZ		; SIZE OF CFG ENTRY
 	ADD	IY,DE			; BUMP IY TO NEXT ENTRY
-	DJNZ	CEN_INIT1		; LOOP TILL DONE
+	DJNZ	LPT_INIT1		; LOOP TILL DONE
 ;
 	XOR	A			; SIGNAL SUCCESS
 	RET				; DONE
 ;
 ; DRIVER FUNCTION TABLE
 ;
-CEN_FNTBL:
-	.DW	CEN_IN
-	.DW	CEN_OUT
-	.DW	CEN_IST
-	.DW	CEN_OST
-	.DW	CEN_INITDEV
-	.DW	CEN_QUERY
-	.DW	CEN_DEVICE
-#IF (($ - CEN_FNTBL) != (CIO_FNCNT * 2))
-	.ECHO	"*** INVALID CEN FUNCTION TABLE ***\n"
+LPT_FNTBL:
+	.DW	LPT_IN
+	.DW	LPT_OUT
+	.DW	LPT_IST
+	.DW	LPT_OST
+	.DW	LPT_INITDEV
+	.DW	LPT_QUERY
+	.DW	LPT_DEVICE
+#IF (($ - LPT_FNTBL) != (CIO_FNCNT * 2))
+	.ECHO	"*** INVALID LPT FUNCTION TABLE ***\n"
 	!!!	; FORCE AN ASSEMBLY ERROR
 #ENDIF
 ;
 ; BYTE INTPUT
 ;
-CEN_IN:
+LPT_IN:
 	; INPUT NOT SUPPORTED - RETURN NULL BYTE
 	LD	E,0			; NULL BYTE
 	XOR	A			; SIGNAL SUCCESS
@@ -133,20 +133,19 @@ CEN_IN:
 ;
 ; BYTE OUTPUT
 ;
-CEN_OUT:
-	CALL	CEN_OST			; READY TO SEND?
-	JR	Z,CEN_OUT		; LOOP IF NOT
-	; *** ADD CODE TO OUTPUT BYTE ***
+LPT_OUT:
+	CALL	LPT_OST			; READY TO SEND?
+	JR	Z,LPT_OUT		; LOOP IF NOT
 	LD	A,(IY+3)
 	LD	C,A			; PORT 0 (DATA)
 	OUT	(C),E			; OUTPUT DATA TO PORT
- 	call 	DELAY   		; ignore anything back after a reset
-        ld      A,%00001101             ; select & strobe, LEDS OFF
+ 	CALL 	DELAY   		; IGNORE ANYTHING BACK AFTER A RESET
+        LD      A,%00001101             ; SELECT & STROBE, LEDS OFF
 	INC 	C 			; PUT CONTROL PORT IN C
 	INC 	C
        OUT	(C),A			; OUTPUT DATA TO PORT
-  	call 	DELAY   		; ignore anything back after a reset
-        ld      A,%00001100             ; select, LEDS OFF
+  	CALL 	DELAY   		; IGNORE ANYTHING BACK AFTER A RESET
+        LD      A,%00001100             ; SELECT, LEDS OFF
        OUT	(C),A			; OUTPUT DATA TO PORT

 	XOR	A			; SIGNAL SUCCESS
@@ -154,14 +153,14 @@ CEN_OUT:
 ;
 ; INPUT STATUS
 ;
-CEN_IST:
+LPT_IST:
 	; INPUT NOT SUPPORTED - RETURN NOT READY
 	XOR	A			; ZERO BYTES AVAILABLE
 	RET				; DONE
 ;
 ; OUTPUT STATUS
 ;
-CEN_OST:
+LPT_OST:
 	LD	A,(IY+3)
 	LD	C,A			; PORT 0 (DATA)
 	INC 	C			; SELECT STATUS PORT
@@ -171,16 +170,16 @@ CEN_OST:
 ;
 ; INITIALIZE DEVICE
 ;
-CEN_INITDEV:
+LPT_INITDEV:
 	HB_DI				; AVOID CONFLICTS
-	CALL	CEN_INITDEVX		; DO THE REAL WORK
+	CALL	LPT_INITDEVX		; DO THE REAL WORK
 	HB_EI				; INTS BACK ON
 	RET				; DONE
 ;
 ; THIS ENTRY POINT BYPASSES DISABLING/ENABLING INTS WHICH IS REQUIRED BY
 ; PREINIT ABOVE.  PREINIT IS NOT ALLOWED TO ENABLE INTS!
 ;
-CEN_INITDEVX:
+LPT_INITDEVX:
 	LD	A,(IY+3)
 	LD	C,A			; PORT 0 (DATA)
 	XOR	A			; CLEAR ACCUM
@@ -197,7 +196,7 @@ CEN_INITDEVX:
 ;
 ;
 ;
-CEN_QUERY:
+LPT_QUERY:
 	LD	E,(IY+4)		; FIRST CONFIG BYTE TO E
 	LD	D,(IY+5)		; SECOND CONFIG BYTE TO D
 	XOR	A			; SIGNAL SUCCESS
@@ -205,8 +204,8 @@ CEN_QUERY:
 ;
 ;
 ;
-CEN_DEVICE:
-	LD	D,CIODEV_CEN		; D := DEVICE TYPE
+LPT_DEVICE:
+	LD	D,CIODEV_LPT		; D := DEVICE TYPE
 	LD	E,(IY)			; E := PHYSICAL UNIT
 	LD	C,$40			; C := DEVICE TYPE, 0x40 IS PIO
 	LD	H,(IY+1)		; H := MODE
@@ -214,62 +213,71 @@ CEN_DEVICE:
 	XOR	A			; SIGNAL SUCCESS
 	RET
 ;
-; CEN DETECTION ROUTINE
+; LPT DETECTION ROUTINE
 ;
-CEN_DETECT:
+LPT_DETECT:
 	LD	A,(IY+3)		; BASE PORT ADDRESS
-	ADD	A,2			; USE PORT 2 FOR DETECT
 	LD	C,A			; PUT IN C FOR I/O
-	CALL	CEN_DETECT2		; CHECK IT
-	JR	Z,CEN_DETECT1		; FOUND IT, RECORD IT
-	LD	A,CEN_NONE		; NOTHING FOUND
+	CALL	LPT_DETECT2		; CHECK IT
+	JR	Z,LPT_DETECT1		; FOUND IT, RECORD IT
+	LD	A,LPT_NONE		; NOTHING FOUND
 	RET				; DONE
 ;
-CEN_DETECT1:
-	; CEN FOUND, RECORD IT
-	LD	A,CEN_MBC		; RETURN CHIP TYPE
+LPT_DETECT1:
+	; LPT FOUND, RECORD IT
+	LD	A,LPT_IBM		; RETURN CHIP TYPE
 	RET				; DONE
 ;
-CEN_DETECT2:
-	; LOOK FOR CEN AT PORT ADDRESS IN C
-	XOR	A			; DEFAULT VALUE
+LPT_DETECT2:
+	; LOOK FOR LPT AT BASE PORT ADDRESS IN C
+	INC	C			; PORT C FOR I/O
+	INC	C			; ...
+	XOR	A			; DEFAULT VALUE (TRI-STATE OFF)
 	OUT	(C),A			; SEND IT
-	IN	A,(C)			; READ IT
-	AND	%11000000		; ISOLATE STATUS BITS
-	CP	%00000000		; CORRECT VALUE?
-	RET	NZ			; IF NOT, RETURN
-	LD	A,%11000000		; STATUS BITS ON (LEDS OFF)
+;
+	;IN	A,(C)			; READ IT
+	;AND	%11000000		; ISOLATE STATUS BITS
+	;CP	%00000000		; CORRECT VALUE?
+	;RET	NZ			; IF NOT, RETURN
+	;LD	A,%11000000		; STATUS BITS ON (LEDS OFF)
+	;OUT	(C),A			; SEND IT
+	;IN	A,(C)			; READ IT
+	;AND	%11000000		; ISOLATE STATUS BITS
+	;CP	%11000000		; CORRECT VALUE?
+;
+	DEC	C			; BACK TO BASE PORT
+	DEC	C			; ...
+	LD	A,$A5			; TEST VALUE
 	OUT	(C),A			; SEND IT
-	IN	A,(C)			; READ IT
-	AND	%11000000		; ISOLATE STATUS BITS
-	CP	%11000000		; CORRECT VALUE?
+	IN	A,(C)			; READ IT BACK
+	CP	$A5			; CORRECT?
 	RET				; RETURN (ZF SET CORRECTLY)
 ;
 ;
 ;
-CEN_PRTCFG:
+LPT_PRTCFG:
 	; ANNOUNCE PORT
 	CALL	NEWLINE			; FORMATTING
-	PRTS("CEN$")			; FORMATTING
+	PRTS("LPT$")			; FORMATTING
 	LD	A,(IY)			; DEVICE NUM
 	CALL	PRTDECB			; PRINT DEVICE NUM
 	PRTS(": IO=0x$")		; FORMATTING
 	LD	A,(IY+3)		; GET BASE PORT
 	CALL	PRTHEXBYTE		; PRINT BASE PORT

-	; PRINT THE CEN TYPE
+	; PRINT THE LPT TYPE
 	CALL	PC_SPACE		; FORMATTING
-	LD	A,(IY+1)		; GET CEN TYPE BYTE
+	LD	A,(IY+1)		; GET LPT TYPE BYTE
 	RLCA				; MAKE IT A WORD OFFSET
-	LD	HL,CEN_TYPE_MAP		; POINT HL TO TYPE MAP TABLE
+	LD	HL,LPT_TYPE_MAP		; POINT HL TO TYPE MAP TABLE
 	CALL	ADDHLA			; HL := ENTRY
 	LD	E,(HL)			; DEREFERENCE
 	INC	HL			; ...
 	LD	D,(HL)			; ... TO GET STRING POINTER
 	CALL	WRITESTR		; PRINT IT
 ;
-	; ALL DONE IF NO CEN WAS DETECTED
-	LD	A,(IY+1)		; GET CEN TYPE BYTE
+	; ALL DONE IF NO LPT WAS DETECTED
+	LD	A,(IY+1)		; GET LPT TYPE BYTE
 	OR	A			; SET FLAGS
 	RET	Z			; IF ZERO, NOT PRESENT
 ;
@@ -280,41 +288,41 @@ CEN_PRTCFG:
 ;
 ;
 ;
-CEN_TYPE_MAP:
-		.DW	CEN_STR_NONE
-		.DW	CEN_STR_MBC
+LPT_TYPE_MAP:
+		.DW	LPT_STR_NONE
+		.DW	LPT_STR_IBM
 ;
-CEN_STR_NONE	.DB	"<NOT PRESENT>$"
-CEN_STR_MBC	.DB	"MBC$"
+LPT_STR_NONE	.DB	"<NOT PRESENT>$"
+LPT_STR_IBM	.DB	"IBM$"
 ;
 ; WORKING VARIABLES
 ;
-CEN_DEV		.DB	0		; DEVICE NUM USED DURING INIT
+LPT_DEV		.DB	0		; DEVICE NUM USED DURING INIT
 ;
-; CEN DEVICE CONFIGURATION TABLE
+; LPT DEVICE CONFIGURATION TABLE
 ;
-CEN_CFG:
+LPT_CFG:
 ;
-CEN0_CFG:
-	; CEN MODULE A CONFIG
+LPT0_CFG:
+	; LPT MODULE A CONFIG
 	.DB	0			; DEVICE NUMBER (SET DURING INIT)
-	.DB	0			; CEN TYPE (SET DURING INIT)
+	.DB	0			; LPT TYPE (SET DURING INIT)
 	.DB	0			; MODULE ID
-	.DB	CEN0BASE		; BASE PORT
+	.DB	LPT0BASE		; BASE PORT
 	.DW	0			; LINE CONFIGURATION
 ;
-CEN_CFGSIZ	.EQU	$ - CEN_CFG	; SIZE OF ONE CFG TABLE ENTRY
+LPT_CFGSIZ	.EQU	$ - LPT_CFG	; SIZE OF ONE CFG TABLE ENTRY
 ;
-#IF (CENCNT >= 2)
+#IF (LPTCNT >= 2)
 ;
-CEN1_CFG:
-	; CEN MODULE B CONFIG
+LPT1_CFG:
+	; LPT MODULE B CONFIG
 	.DB	0			; DEVICE NUMBER (SET DURING INIT)
-	.DB	0			; CEN TYPE (SET DURING INIT)
+	.DB	0			; LPT TYPE (SET DURING INIT)
 	.DB	1			; MODULE ID
-	.DB	CEN1BASE		; BASE PORT
+	.DB	LPT1BASE		; BASE PORT
 	.DW	0			; LINE CONFIGURATION
 ;
 #ENDIF
 ;
-CEN_CFGCNT	.EQU	($ - CEN_CFG) / CEN_CFGSIZ
+LPT_CFGCNT	.EQU	($ - LPT_CFG) / LPT_CFGSIZ
--- a/Source/HBIOS/sn76489.asm
+++ b/Source/HBIOS/sn76489.asm
@@ -43,6 +43,9 @@ SN7RATIO	.EQU	SN7CLK * 100 / 32

 SN76489_INIT:
 	LD	IY, SN7_IDAT		; POINTER TO INSTANCE DATA
+	LD	BC, SN7_FNTBL		; BC := FUNCTION TABLE ADDRESS
+	LD	DE, SN7_IDAT		; DE := SN7 INSTANCE DATA PTR
+	CALL	SND_ADDENT		; ADD ENTRY, A := UNIT ASSIGNED

 	LD	DE,STR_MESSAGELT
 	CALL	WRITESTR
@@ -53,11 +56,6 @@ SN76489_INIT:
 	CALL	WRITESTR
 	LD	A, SN76489_PORT_RIGHT
 	CALL	PRTHEXBYTE
-;
-SN7_INIT1:
-	LD	BC, SN7_FNTBL		; BC := FUNCTION TABLE ADDRESS
-	LD	DE, SN7_IDAT		; DE := SN7 INSTANCE DATA PTR
-	CALL	SND_ADDENT		; ADD ENTRY, A := UNIT ASSIGNED

 	CALL	SN7_VOLUME_OFF
 	XOR	A			; SIGNAL SUCCESS
@@ -67,7 +65,6 @@ SN7_INIT1:
 ; SN76489 DRIVER - SOUND ADAPTER (SND) FUNCTIONS
 ;======================================================================
 ;
-
 SN7_RESET:
 	AUDTRACE(SNT_INIT)
 	CALL	SN7_VOLUME_OFF
--- a/Source/Images/Build.cmd
+++ b/Source/Images/Build.cmd
@@ -13,7 +13,7 @@ call BuildDisk.cmd nzcom fd wbw_fd144 ..\zsdos\zsys_wbw.sys || exit /b
 call BuildDisk.cmd cpm3 fd wbw_fd144 ..\cpm3\cpmldr.sys || exit /b
 call BuildDisk.cmd zpm3 fd wbw_fd144 ..\zpm3\zpmldr.sys || exit /b
 call BuildDisk.cmd ws4 fd wbw_fd144 || exit /b
-call BuildDisk.cmd qpm fd wbw_fd144 ..\cpm22\cpm_wbw.sys || exit /b
+call BuildDisk.cmd qpm fd wbw_fd144 d_qpm\u0\qpm.sys || exit /b

 echo.
 echo Building Hard Disk Images (512 directory entry format)...
@@ -25,7 +25,7 @@ call BuildDisk.cmd cpm3 hd wbw_hd512 ..\cpm3\cpmldr.sys || exit /b
 call BuildDisk.cmd zpm3 hd wbw_hd512 ..\zpm3\zpmldr.sys || exit /b
 call BuildDisk.cmd ws4 hd wbw_hd512 || exit /b
 call BuildDisk.cmd dos65 hd wbw_hd512 ..\zsdos\zsys_wbw.sys || exit /b
-call BuildDisk.cmd qpm hd wbw_hd512 ..\cpm22\cpm_wbw.sys || exit /b
+call BuildDisk.cmd qpm hd wbw_hd512 d_qpm\u0\qpm.sys || exit /b

 if exist ..\BPBIOS\bpbio-ww.rel call BuildDisk.cmd bp hd wbw_hd512 || exit /b

@@ -42,7 +42,7 @@ call BuildDisk.cmd nzcom hd wbw_hd1024 ..\zsdos\zsys_wbw.sys || exit /b
 call BuildDisk.cmd cpm3 hd wbw_hd1024 ..\cpm3\cpmldr.sys || exit /b
 call BuildDisk.cmd zpm3 hd wbw_hd1024 ..\zpm3\zpmldr.sys || exit /b
 call BuildDisk.cmd ws4 hd wbw_hd1024 || exit /b
-call BuildDisk.cmd qpm hd wbw_hd1024 ..\cpm22\cpm_wbw.sys || exit /b
+call BuildDisk.cmd qpm hd wbw_hd1024 d_qpm\u0\qpm.sys || exit /b

 if exist ..\BPBIOS\bpbio-ww.rel call BuildDisk.cmd bp hd wbw_hd1024 || exit /b

--- a/Source/Images/Makefile
+++ b/Source/Images/Makefile
@@ -70,7 +70,8 @@ blankhd1024:
 %.img: $(SYSTEMS) blank144 blankhd512 blankhd1024 Makefile
 	@sys= ; \
 	case $@ in \
-		(*cpm22* | *qpm*) sys=../CPM22/cpm_wbw.sys;; \
+		(*cpm22*) sys=../CPM22/cpm_wbw.sys;; \
+		(*qpm*) sys=d_qpm/u0/qpm.sys;; \
 		(*zsdos* | *nzcom* | *dos65*) sys=../ZSDOS/zsys_wbw.sys;; \
 		(*cpm3*) sys=../CPM3/cpmldr.sys;; \
 		(*zpm3*) sys=../ZPM3/zpmldr.sys;; \
--- a/Source/Images/d_dos65/u0/hi.com
+++ b/Source/Images/d_dos65/u0/hi.com
--- a/Source/Images/d_dos65/u0/monitor.com
+++ b/Source/Images/d_dos65/u0/monitor.com
--- a/Source/Images/d_dos65/u0/scream.com
+++ b/Source/Images/d_dos65/u0/scream.com
--- a/Source/Images/d_qpm/ReadMe.txt
+++ b/Source/Images/d_qpm/ReadMe.txt
@@ -1,9 +1,21 @@
 ===== QP/M Disk for RomWBW =====

 This disk contains the distribution files for the QP/M Operating
-System.  The disk is initially set up to boot CP/M 2.2.  You
-must use the QINSTALL program to install QP/M on the boot
-tracks and subsequently boot QP/M.
+System.  The disk is bootable with QP/M already installed on the
+system tracks.  The qpm.sys file and the QP/M image on the system
+tracks was created using QINSTALL with default settings EXCEPT
+for the two settings described under Notes (current drive/user
+storage address and TIMDAT vector).
+
+QINSTALL can be run again as desired to further customize your 
+installation.  However, note that QINSTALL does NOT remember prior 
+settings, so you must reapply all settings you made previously
+especially the two setting changes described below.
+
+This disk includes the standard DRI CP/M 2.2 files in addition to the
+QP/M files.  QP/M generally assumes you already had DRI CP/M 2.2
+prior to adding QP/M features.  Since QP/M does not replace all
+features of CP/M 2.2, the CP/M 2.2 files are also included.

 == Notes ==

@@ -15,6 +27,169 @@ to something else.  I have been using 0x000E without issue.
 RomWBW CBIOS has been modified to put the QP/M TIMDAT vector at 0x0010.  The
 vector points into CBIOS where the actual TIMDAT routine is located.  The
 TIMDAT routine reads the current date/time from HBIOS, changes the values from
-BCD to binary, and rearranges some bytes for QP/M compatibilty.
+BCD to binary, and rearranges some bytes for QP/M compatibilty.  When
+running QINSTALL, you should set the TIMDAT vector to 0x0010 to
+enabled QP/M to use your RomWBW real time clock.

--WBW 5:29 PM 6/4/2022
+By default, DEBUGZ utilizes the RST 38 restart vector for setting
+code brakpoints.  This conflicts the use of that vector for any
+system that is using interrupt mode 1.  DEBUGZ can be configured
+(using DBGINST) to use a different vector.
+
+The QSTAMP program, which is used to initialize a disk for date/time
+stamping, misbehavews when run on the (new) RomWBW 1024 directory
+format disks.  It creates an invalid directory entry for the
+date/time stamp data file.  This is definitely a QP/M issue.  The
+directory entry can be manually corrected.
+
+== ZSDOS 1.1 Files ==
+
+The following files came from the official QP/M distribution.  Actually,
+they came from 3 Microcode Consulting files (qpm27.zip, debugz.zip,
+and linkz.zip).  The original distribution files can be found on the
+Microcode Consulting website at https://www.microcodeconsulting.com/.
+Documentation (pdf) files are incuded in these original distribution
+.zip files.  These documentation files have not been included in the
+RomWBW distribution.  Please retrieve them yourself from the website
+if desired.
+
+D.COM - Directory lister
+DBGINST.COM - Configures DEBUGZ debugger
+DEBUGZ.COM - QP/M debugger
+DEBUGZ.HLP - QP/M debugger help file
+DHORIZ.COM - Version of directory lister for horizontal file sorting
+HELLO.QPM - Text file with QP/M version information
+LZ.COM - QP/M linker
+QBACKUP.COM - Data backup application
+QINSTALL.COM - QP/M installer / configurator
+QPATCH.COM - Patches (customizes) a few QP/M applications
+QPIP.COM - QP/M enhanced version of CP/M 2.2 PIP application
+QPM.SYS - RomWBW configured QP/M system image (for use with SYSCOPY)
+QPMCLK.MAC - Example of QP/M clock assembler routine
+QPMCMDS.TXT - Brief summary of QP/M commands
+QPMUTILS.TXT - Brief summary of QP/M utilities
+QSTAMP.COM - Initializes disk for date/time stamping
+QSTAMPV.COM - Initializes disk for date/time stamping (vertical sort)
+QSTAMPX.COM - Initializes disk for date/time stamping (horizontal sort)
+QSTAT.COM - QP/M enhanced version of CP/M 2.2 STAT application
+QSUB.COM - QP/M batch file submission program
+QSWEEP.COM - QP/M directory sweep utility
+QTERM.DAT - Terminal control codes used by DEBUGZ
+QTERMS.LIB - Library of available terminal definitions
+SETQTERM.COM - Configures QTERM.DAT
+TDCNFG.COM - Configures date/time directory display preferences
+
+== CP/M 2.2 Files ==
+
+The following files have been included from CP/M 2.2.  These files
+provide various functionality that is not really available from the
+ZSDOS applications themselves.  For example, the CP/M 2.2 application
+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 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 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
+
+== RomWBW Supplemental Applications ==
+
+The following files provide specific functionality enabled by
+RomWBW enhancements.  These applications are documented in the
+"RomWBW Applications.pdf" document in the Doc directory of the
+RomWBW Distribution.
+
+ASSIGN.COM - Assign,remove,swap drive letters of RomWBW disk slices
+FAT.COM - MS-DOS FAT filesystem tool (list, copy, delete, format, etc.)
+FDU.COM - Test floppy hardware and format floppy disks
+FORMAT.COM - Placeholder application with formatting instructions
+INTTEST.COM - Test RomWBW interrupt processing on your hardware
+MODE.COM - Change serial line characteristics (baud rate, etc.)
+RTC.COM - Test real time clock hardware on your system
+SURVEY.COM - Display system resources summary
+SYSCOPY.COM - Copy system tracks to disks (make bootable)
+SYSGEN.COM - Copy system tracks to disks (DRI version)
+TALK.COM - Route console I/O to & from specified serial port
+TIMER.COM - Test and display system timer ticks
+TUNE.COM - Play .PT2, .PT3, and .MYM audio files on supported hardware
+XM.COM - XModem file transfer application
+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
+
+== General Purpose Applications ==
+
+The following files are commonly used CP/M applications that
+are generally useful in any CP/M-like system.  In general, there is
+no documentation for these applications included with the RomWBW
+distribution.  Some provide command line help themselves.  Some
+are fairly obvious.
+
+CLRDIR.COM - Initializes the directory area of a disk
+COMPARE.COM - Compare content of two files (binary)
+CRUNCH.COM - Compress file(s) using Crunch algorithm
+CRUNCH28.CFG - ZCNFG configuration file for CRUNCH & UNCR
+DDTZ.COM - Z80 debug tool (modified to use RST 6)
+DDTZ.DOC - Documentation for DDTZ
+EX.COM - Batch file processor (alternative to DRI SUBMIT)
+FDISK80.COM - Hard disk partitioning tool (from John Coffman)
+FIND.COM - Search all drives for a file (from Jay Cotton)
+FLASH.COM - Program FLASH chips in-situ (from Will Sowerbutts)
+FLASH.DOC - Documentation for FLASH
+MBASIC.COM - Microsoft BASIC language interpreter
+NULU.COM - Library (.LBR) management tool
+PMARC.COM - Create or add file(s) to .PMA archive
+PMEXT.COM - Extract file(s) from .PMA/.LZH/.LHA archive
+RMXSUB1.COM - Remove XSUB1 RSX from memory (from Lars Nelson)
+SUPERSUB.COM - Enhanced replacement for DRI SUBMIT
+SUPERSUB.DOC - Documentation for SUPERSUB
+TDLBASIC.COM - TDL Zapple 12K BASIC language interpreter
+UNARC.COM - Extract file(s) from .ARC or .ARK archive
+UNARC.DOC - Documentation for UNARC
+UNCR.COM - Decompress Crunched file(s)
+UNZIP.COM - UNZIPZ extracts from all MS-DOS ZIP files (from Lars Nelson)
+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 - 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
+ZXD.COM - Enhanced directory lister w/ date/time stamp support
+ZXD.CFG - ZCNFG configuration file for ZXD
+
+== Testing Applications (User Area 2) ==
+
+User area 2 contains a variety of hardware testing applications.
+These are generally user contributed and have no documentation.
+Additionally, they are frequently not compatible with all RomWBW
+hardware.  They are included here as a convenience.  If applicable,
+your hardware documentation should refer to them and provide usage
+instructions.
+
+== Sample Tune Files (User Area 3) ==
+
+User area 3 contains sample audio files that can be played using
+the TUNE application.
+
+== CP/NET 1.2 (User Area 4) ==
+
+User area 4 contains a full implementation of the CP/NET 1.2
+client provided by Doug Miller.  Please read the README.TXT file
+in this user area for more information.
+
+N.B., at a minimum, some of the files in this user area must be copied
+to user area 0 for CP/NET to work properly.
+
+--WBW 4:41 PM 6/10/2022
--- a/Source/Images/d_qpm/u0/qpm.sys
+++ b/Source/Images/d_qpm/u0/qpm.sys
--- 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.172"
+#DEFINE BIOSVER	"3.1.1-pre.175"
--- 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.172"
+	db	"3.1.1-pre.175"
 	endm
Author	SHA1	Message	Date
Wayne Warthen	44b17ccc3a	Improve Centronics Compatibility - Renamed Centronics driver from "CEN" to "LPT" based on input that LPT is the more recognized name for IBM compatible Centronics interfaces. - Modified LPT hardware detection to be more generic (no longer depends on MBC-specific hardware implementation). - Fix to CPU speed display for SBC v2 (004 and above) speed selection mechanism.	2022-06-26 14:25:32 -07:00
Wayne Warthen	b2e1294452	Correct AY38910 Off By 1 Octave Issue I think this update corrects a long-standing issue in which the AY38910 driver played notes off by one octave.	2022-06-20 20:07:06 -07:00
Wayne Warthen	5805f13a62	Add Utilities to DOS65 Disk Image	2022-06-17 11:13:11 -07:00
Wayne Warthen	d39f0201f4	Bootable QP/M Disk - Put a preconfigured image of QP/M on the system tracks of the QP/M disk images. - Minor adjustment to dbgmon.asm for compatibility with UNA.	2022-06-17 10:25:48 -07:00
Wayne Warthen	94cf9a209e	Merge pull request #290 from b1ackmai1er/dev Build fixup (rtcdefval), recovery mode message, fixup for 3 sound devices	2022-06-17 10:21:29 -07:00
b1ackmai1er	691842c1bc	Fix default	2022-06-17 21:49:08 +08:00
b1ackmai1er	eb255e7016	Add bank unset. Fix xmodem transfer bios call	2022-06-17 21:37:23 +08:00
b1ackmai1er	fe19472a2c	Fixup restore of rtcval in ay-3-8910 driver	2022-06-17 18:39:18 +08:00
b1ackmai1er	526a1a5d33	Fixup restore of rtcval in ay-3-8910 driver	2022-06-17 18:35:46 +08:00
b1ackmai1er	719c993a60	MBC6502 support in dbgmon Add an option in the monitor to switch to MBC6502. Excluded by default.	2022-06-17 18:30:35 +08:00
b1ackmai1er	70697a762c	Merge pull request #14 from wwarthen/dev Dev	2022-06-15 21:42:34 +08:00
b1ackmai1er	c1412ee755	Fix boot failure with three sound devices	2022-06-01 19:19:56 +08:00
b1ackmai1er	e974a4a960	Recovery mode message, ay-3-8910 build fix	2022-05-31 21:06:02 +08:00
b1ackmai1er	0549cdcb36	Merge pull request #13 from wwarthen/dev Dev	2022-05-17 21:02:36 +08:00
b1ackmai1er	c046f0365c	Merge pull request #12 from wwarthen/dev Dev	2022-04-04 20:35:39 +08:00
b1ackmai1er	4af5d457eb	Merge pull request #11 from wwarthen/dev Dev	2022-03-27 17:47:27 +08:00
b1ackmai1er	291017f1a9	Merge pull request #10 from wwarthen/dev Dev	2022-03-23 05:58:08 +08:00
b1ackmai1er	59c523c575	Merge pull request #9 from wwarthen/dev Miscellaneous Cleanup	2022-01-04 18:56:11 +08:00
b1ackmai1er	4d3640caaa	Merge pull request #8 from wwarthen/dev Dev	2021-12-26 18:32:32 +08:00
b1ackmai1er	d02fe9d8df	Merge pull request #7 from wwarthen/dev Dev	2021-12-11 09:17:58 +08:00
b1ackmai1er	bc04d5ecb9	Merge pull request #6 from wwarthen/dev ZPM3 Fixes	2021-12-09 16:45:36 +08:00
b1ackmai1er	5439a12fe8	Merge pull request #5 from wwarthen/dev Dev	2021-12-09 00:35:01 +08:00