Fix CBIOS Bug

- Corrects the dynamic disk buffer allocation routine in CBIOS and ASSIGN.COM.  They had the DPB assignments inverted causing slightly wrong buffer allocations for RAM and ROM disks.

Credit to Andrew Lynch for discovering this issue.

Source/Apps/assign.asm

@@ -27,6 +27,7 @@
 ;   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
+;   2021-12-06 [WBW] Fix inverted ROM/RAM DPB mapping in buffer alloc
 ;_______________________________________________________________________________
 ;
 ; ToDo:
@@ -639,7 +640,7 @@ makdphwbw:	; determine appropriate dpb (WBW mode, unit number in A)
 	jr	nz,makdph00	; if not, skip ahead to other types
 	ld	a,e		; physical unit number to A
 	ld	e,1		; assume rom
-	cp	$00		; rom?
+	cp	$01		; rom?
 	jr	z,makdph0	; yes, jump ahead
 	ld	e,2		; otherwise ram
 	jr	makdph0		; jump ahead
@@ -1567,6 +1568,23 @@ prtdec2:
 	call	prtchr
 	ret
 ;
+; Print a byte buffer in hex pointed to by DE
+; Register A has size of buffer
+;
+prthexbuf:
+	or	a
+	ret	z		; empty buffer
+;
+	ld	b,a
+prthexbuf1:
+	ld	a,' '
+	call	prtchr
+	ld	a,(de)
+	call	prthex
+	inc	de
+	djnz	prthexbuf1
+	ret
+;
 ; Start a new line
 ;
 crlf2:
@@ -1893,10 +1911,10 @@ stack	.equ	$		; stack top
 ; Messages
 ;
 indent	.db	"   ",0
-msgban1	.db	"ASSIGN v1.4 for RomWBW CP/M, 12-May-2020",0
+msgban1	.db	"ASSIGN v1.4a for RomWBW CP/M, 6-Dec-2021",0
 msghb	.db	" (HBIOS Mode)",0
 msgub	.db	" (UBIOS Mode)",0
-msgban2	.db	"Copyright 2020, Wayne Warthen, GNU GPL v3",0
+msgban2	.db	"Copyright 2021, Wayne Warthen, GNU GPL v3",0
 msguse	.db	"Usage: ASSIGN D:[=[{D:|<device>[<unitnum>]:[<slicenum>]}]][,...]",13,10
 	.db	"  ex. ASSIGN           (display all active assignments)",13,10
 	.db	"      ASSIGN /?        (display version and usage)",13,10

Source/CBIOS/cbios.asm

@@ -3059,12 +3059,12 @@ MAKDPH0:
 	; RAM/ROM DISK DPB DERIVATION
 	; TYPE OF MEMORY DISK (RAM/ROM) DETERMINED BY PHYSICAL UNIT NUMBER
 	LD	A,E		; LOAD PHYSICAL UNIT NUMBER
-	LD	DE,DPB_ROM	; PRELOAD ROM DISK DPB
-	OR	A		; UNIT=0 (ROM)?
-	JR	Z,MAKDPH1	; IF UNIT=0, IT IS ROM, PROCEED TO DPH CREATION
 	LD	DE,DPB_RAM	; PRELOAD RAM DISK DPB
-	CP	$01		; UNIT=1 (RAM)?
-	JR	Z,MAKDPH1	; IF UNIT=0, IT IS ROM, PROCEED TO DPH CREATION
+	OR	A		; UNIT=0 (RAM)?
+	JR	Z,MAKDPH1	; IF SO, CREATE RAM DISK DPH
+	LD	DE,DPB_ROM	; PRELOAD ROM DISK DPB
+	CP	$01		; UNIT=1 (ROM)?
+	JR	Z,MAKDPH1	; IF SO, CREATE ROM DISK DPH
 	CALL	PANIC		; OTHERWISE UNKNOWN, NOT POSSIBLE, JUST PANIC
 ;
 #ENDIF

Source/ver.inc

@@ -2,4 +2,4 @@
 #DEFINE	RMN	1
 #DEFINE	RUP	1
 #DEFINE	RTP	0
-#DEFINE BIOSVER	"3.1.1-pre.141"
+#DEFINE BIOSVER	"3.1.1-pre.142"

Source/ver.lib

@@ -3,5 +3,5 @@ rmn	equ	1
 rup	equ	1
 rtp	equ	0
 biosver	macro
-	db	"3.1.1-pre.141"
+	db	"3.1.1-pre.142"
 	endm