Small Bug Fix for PPA/IMM/SYQ Drivers

Credit to Mark Elkin for testing and finding this issue.

Doc/ChangeLog.txt

@@ -7,7 +7,9 @@ Version 3.3
 - WBW: Support per-drive floppy configuration
 - WBW: Support for Bill Shen's VGARC
 - WBW: Support for MG014 Parallel Port module + printer
-- WBW: Support for Zip Drive on emm interface (much inspiration from Alan Cox)
+- WBW: Support for EMM Zip Drive on PPI interface (much inspiration from Alan Cox)
+- WBW: Support for PPA Zip Drive on PPI interface (much inspiration from Alan Cox)
+- WBW: Support for SyQuest SparQ Drive on PPI interface (much inspiration from Alan Cox)
 
 Version 3.2.1
 -------------

Source/HBIOS/imm.asm

@@ -235,28 +235,51 @@ IMM_DETECT:
 	OUT	(C),A			; DO IT
 	CALL	DELAY			; BRIEF DELAY FOR GOOD MEASURE
 ;
-	; WE USE THIS SEQUENCE TO DETECT AN ACTUAL IMM DEVICE ON THE
-	; PARALLEL PORT.  THE VALUES RECORDED IN THE FINAL CALL TO
-	; IMM_DISCONNECT ARE USED TO CONFIRM DEVICE PRESENCE.
-	; NO ACTUAL SCSI COMMANDS ARE USED.
+	; ATTEMPT TO ESTABLISH A CONNECTION TO THE IMM DEVICE AND
+	; ISSUE A SCSI BUS RESET.  WE DON'T KNOW IF DEVICE IS THERE
+	; YET.  THIS IS DONE BLIND ASSUMING IT IS THERE.
 	CALL	IMM_DISCONNECT
 	CALL	IMM_CONNECT
+	CALL	IMM_RESETPULSE		; ISSUE A SCSI BUS RESET
+	LD	DE,62			; WAIT A BIT
+	CALL	VDELAY
+;
+	; USE AN ABBREVIATED VERSION OF SELECT PROCESSING TO
+	; CHECK IF DEVICE EXISTS.
+	IMM_WCTL($0C)
+	CALL	IMM_READSTATUS
+;
+#IF (IMMTRACE >= 3)
+	CALL	PC_SPACE
+	CALL	PRTHEXBYTE
+#ENDIF
+;
+	; READY FOR SELECT?
+	AND	$08
+	CP	$00
+	JR	NZ,IMM_DETECT1
+;
+	IMM_WCTL($04)
+	LD	A,$80 | (1 << IMM_TGT)
+	CALL	IMM_WRITEDATA
+	IMM_WCTL($0C)
+	IMM_WCTL($0D)
+	CALL	DELAY
+	CALL	IMM_READSTATUS
+;
+#IF (IMMTRACE >= 3)
+	CALL	PC_SPACE
+	CALL	PRTHEXBYTE
+#ENDIF
+;
+	; DID SELECT SUCCEED?
+	AND	$08
+	CP	$08
+;
+IMM_DETECT1:
+	PUSH	AF
 	CALL	IMM_DISCONNECT
-;
-	; THE IMM_SN VALUES ARE RECORDED IN THE CPP ROUTINE USED BY
-	; IMM_CONNECT/DISCONNECT.
-	; EXPECTING S1=$B8, S2=$18, S3=$38
-	LD	A,(IMM_S1)
-	CP	$B8
-	RET	NZ
-	LD	A,(IMM_S2)
-	CP	$18
-	RET	NZ
-	LD	A,(IMM_S3)
-	CP	$38
-	RET	NZ
-;
-	XOR	A
+	POP	AF
 	RET
 ;
 ;=============================================================================
@@ -305,10 +328,12 @@ IMM_WRITE:
 ;
 ;
 IMM_IO:
-	LD	(IMM_DSKBUF),HL		; SAVE DISK BUFFER ADDRESS
+	PUSH	HL
 	CALL	IMM_CHKERR		; CHECK FOR ERR STATUS AND RESET IF SO
+	POP	HL
 	JR	NZ,IMM_IO3		; BAIL OUT ON ERROR
 ;
+	LD	(IMM_DSKBUF),HL		; SAVE DISK BUFFER ADDRESS
 	; SETUP LBA
 	; 3 BYTES, LITTLE ENDIAN -> BIG ENDIAN
 	LD	HL,IMM_CMD_RW+1		; START OF LBA FIELD IN CDB (MSB)
@@ -610,6 +635,10 @@ IMM_SELECT:
 ;
 IMM_SELECT1:
 	CALL	IMM_READSTATUS
+#IF (IMMTRACE >= 3)
+	CALL	PC_SPACE
+	CALL	PRTHEXBYTE
+#ENDIF
 	AND	$08
 	JR	Z,IMM_SELECT2		; IF CLEAR, MOVE ON
 	DEC	HL
@@ -623,22 +652,8 @@ IMM_SELECT2:
 	; PLACE HOST AND TARGET BIT ON DATA BUS
 	LD	A,$80 | (1 << IMM_TGT)
 	CALL	IMM_WRITEDATA
-	CALL	DELAY			; CONFIRM DELAY TIME?
 	IMM_WCTL($0C)
-;
-#IF (IMMTRACE >= 3)
-	CALL	IMM_READSTATUS
-	CALL	PC_SPACE
-	CALL	PRTHEXBYTE
-#ENDIF
-;
 	IMM_WCTL($0D)
-;
-#IF (IMMTRACE >= 3)
-	CALL	IMM_READSTATUS
-	CALL	PC_SPACE
-	CALL	PRTHEXBYTE
-#ENDIF
 ;
 	LD	HL,500			; TIMEOUT COUNTER
 ;

Source/HBIOS/ppa.asm

@@ -324,10 +324,12 @@ PPA_WRITE:
 ;
 ;
 PPA_IO:
-	LD	(PPA_DSKBUF),HL		; SAVE DISK BUFFER ADDRESS
+	PUSH	HL
 	CALL	PPA_CHKERR		; CHECK FOR ERR STATUS AND RESET IF SO
+	POP	HL
 	JR	NZ,PPA_IO3		; BAIL OUT ON ERROR
 ;
+	LD	(PPA_DSKBUF),HL		; SAVE DISK BUFFER ADDRESS
 	; SETUP LBA
 	; 3 BYTES, LITTLE ENDIAN -> BIG ENDIAN
 	LD	HL,PPA_CMD_RW+1		; START OF LBA FIELD IN CDB (MSB)
@@ -595,7 +597,6 @@ PPA_SELECT:
 	PPA_WCTL($0C)
 	LD	A,1 << PPA_SELF
 	CALL	PPA_WRITEDATA
-	LD	A,$08 \ CALL	PPA_WRITECTRL
 	PPA_WCTL($08)
 ;
 	LD	HL,500			; TIMEOUT COUNTER

Source/HBIOS/syq.asm

@@ -393,15 +393,17 @@ SYQ_WRITE:
 ;
 ;
 SYQ_IO:
-	LD	(SYQ_DSKBUF),HL		; SAVE DISK BUFFER ADDRESS
-	LD	A,B			; XFR MODE TO ACCUM
-	LD	(SYQ_XFRMODE),A		; AND SAVE IT FOR CMD
 ;
 	PUSH	BC			; SAVE MODE/COMMAND
+	PUSH	HL			; SAVE DISK BUF PTR
 	CALL	SYQ_CHKERR		; CHECK FOR ERR STATUS AND RESET IF SO
+	POP	HL			; RECOVER DISK BUF PTR
 	POP	BC			; RECOVER MODE/COMMAND
 	JR	NZ,SYQ_IO1		; BAIL OUT ON ERROR
 ;
+	LD	A,B			; XFR MODE TO ACCUM
+	LD	(SYQ_XFRMODE),A		; AND SAVE IT FOR CMD
+	LD	(SYQ_DSKBUF),HL		; SAVE DISK BUFFER ADDRESS
 	LD	A,SYQ_LBA		; LBA OFFSET IN CONFIG
 	CALL	LDHLIYA			; POINT TO LBA DWORD
 	CALL	LD32			; SET DE:HL TO LBA

Source/ver.inc

@@ -2,7 +2,7 @@
 #DEFINE	RMN	3
 #DEFINE	RUP	0
 #DEFINE	RTP	0
-#DEFINE BIOSVER	"3.3.0-dev.19"
+#DEFINE BIOSVER	"3.3.0-dev.20"
 #define rmj	RMJ
 #define rmn	RMN
 #define rup	RUP

Source/ver.lib

@@ -3,5 +3,5 @@ rmn	equ	3
 rup	equ	0
 rtp	equ	0
 biosver	macro
-	db	"3.3.0-dev.19"
+	db	"3.3.0-dev.20"
 	endm