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@ -26,9 +26,9 @@ SCSI_SR_CSD .EQU SCSIBASE ; CURRENT SCSI DATA |
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SCSI_SR_ICR .EQU SCSIBASE + $01 ; INITIATOR COMMAND |
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SCSI_SR_MR .EQU SCSIBASE + $02 ; MODE |
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SCSI_SR_TCR .EQU SCSIBASE + $03 ; TARGET COMMAND |
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SCSI_SR_CSBS .EQU SCSIBASE + $04 ; CURRENT SCSI BUS STAT. |
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SCSI_SR_CSBS .EQU SCSIBASE + $04 ; CURRENT SCSI BUS STAT |
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SCSI_SR_BSR .EQU SCSIBASE + $05 ; BUS STATUS |
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SCSI_SR_IDR .EQU SCSIBASE + $06 ; INITIATOR DMA RECV. |
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SCSI_SR_IDR .EQU SCSIBASE + $06 ; INITIATOR DMA RECV |
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SCSI_SR_RPI .EQU SCSIBASE + $07 ; RESET PARITY/IRQ |
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; |
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; NCR 5380 OUTPUT ONLY REGISTERS |
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@ -36,8 +36,8 @@ SCSI_SR_RPI .EQU SCSIBASE + $07 ; RESET PARITY/IRQ |
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SCSI_SR_ODR .EQU SCSIBASE ; OUTPUT DATA |
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SCSI_SR_SER .EQU SCSIBASE + $04 ; SELECT ENABLE |
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SCSI_SR_SDS .EQU SCSIBASE + $05 ; START DMA SEND |
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SCSI_SR_SDTR .EQU SCSIBASE + $06 ; START TARGET DMA RECV. |
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SCSI_SR_SDIR .EQU SCSIBASE + $07 ; START INITIATOR DMA RECV. |
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SCSI_SR_SDTR .EQU SCSIBASE + $06 ; START TARGET DMA RECV |
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SCSI_SR_SDIR .EQU SCSIBASE + $07 ; START INITIATOR DMA RECV |
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; |
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; SCSI CURRENT BUS STATUS BIT MASKS |
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; |
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@ -58,10 +58,14 @@ SCSI_SM_PHM .EQU $08 ; PHASE MATCH BIT |
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; |
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SCSI_DEV .EQU 0 ; OFFSET OF DEVICE NUMBER (BYTE) |
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SCSI_IOBASE .EQU 1 ; IO BASE ADDRESS (BYTE) |
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SCSI_LUN .EQU 2 ; TARGET LUN |
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SCSI_STAT .EQU 3 ; LAST STATUS (BYTE) |
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SCSI_MEDCAP .EQU 4 ; MEDIA CAPACITY (DWORD) |
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SCSI_LBA .EQU 8 ; OFFSET OF LBA (DWORD) |
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SCSI_TGT .EQU 2 ; TARGET DEVICE ID |
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SCSI_TID .EQU 3 ; TARGET DEVICE BIT PATTERN |
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SCSI_LUN .EQU 4 ; TARGET LUN |
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SCSI_STAT .EQU 5 ; LAST STATUS (BYTE) |
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SCSI_MEDCAP .EQU 6 ; MEDIA CAPACITY (DWORD) |
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SCSI_LBA .EQU 10 ; OFFSET OF LBA (DWORD) |
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; |
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SCSI_CFGSIZ .EQU 14 ; SIZE OF CFG TBL ENTRIES |
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; |
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;-------------------------------------------------------------------------------------------------- |
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; HBIOS MODULE HEADER |
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@ -80,8 +84,6 @@ SCSI_INITPHASE: |
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JP Z,SCSI_INIT ; DO INIT |
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RET ; DONE |
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; |
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SCSI_CFGSIZ .EQU 12 ; SIZE OF CFG TBL ENTRIES |
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; |
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SCSI_CFGTBL: |
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; |
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#IF (SCSICNT >= 1) |
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@ -89,6 +91,8 @@ SCSI_CFGTBL: |
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SCSI0_CFG: |
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.DB $FE ; DRIVER DEVICE NUMBER (FILLED DYNAMICALLY) |
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.DB SCSIBASE ; IO BASE ADDRESS |
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.DB SCSI0_TGT ; TARGT DEVICE ID |
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.DB 1 << SCSI0_TGT ; TARGET DEVICE BIT PATTERN |
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.DB SCSI0_LUN ; SCSI TARGET LUN |
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.DB SCSI_STNOTRDY ; DEVICE STATUS |
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.DW $0000,$0010 ; DEVICE CAPACITY (BLOCKS) |
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@ -96,8 +100,8 @@ SCSI0_CFG: |
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; |
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DEVECHO "SCSI: IO=" |
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DEVECHO SCSIBASE |
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DEVECHO ", TGT ID=" |
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DEVECHO SCSI_TID |
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DEVECHO ", TGT=" |
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DEVECHO SCSI0_TGT |
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DEVECHO ", LUN=" |
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DEVECHO SCSI0_LUN |
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DEVECHO "\n" |
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@ -106,6 +110,8 @@ SCSI0_CFG: |
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#IF (SCSICNT >= 2) |
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.DB $FE ; DRIVER DEVICE NUMBER (FILLED DYNAMICALLY) |
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.DB SCSIBASE ; IO BASE ADDRESS |
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.DB SCSI1_TGT ; TARGT DEVICE ID |
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.DB 1 << SCSI1_TGT ; TARGET DEVICE BIT PATTERN |
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.DB SCSI1_LUN ; SCSI TARGET LUN |
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.DB SCSI_STNOTRDY ; DEVICE STATUS |
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.DW $0000,$0010 ; DEVICE CAPACITY (BLOCKS) |
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@ -113,13 +119,51 @@ SCSI0_CFG: |
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; |
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DEVECHO "SCSI: IO=" |
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DEVECHO SCSIBASE |
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DEVECHO ", TGT ID=" |
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DEVECHO SCSI_TID |
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DEVECHO ", TGT=" |
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DEVECHO SCSI1_TGT |
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DEVECHO ", LUN=" |
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DEVECHO SCSI1_LUN |
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DEVECHO "\n" |
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#ENDIF |
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; |
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#IF (SCSICNT >= 3) |
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.DB $FE ; DRIVER DEVICE NUMBER (FILLED DYNAMICALLY) |
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.DB SCSIBASE ; IO BASE ADDRESS |
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.DB SCSI2_TGT ; TARGT DEVICE ID |
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.DB 1 << SCSI2_TGT ; TARGET DEVICE BIT PATTERN |
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.DB SCSI2_LUN ; SCSI TARGET LUN |
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.DB SCSI_STNOTRDY ; DEVICE STATUS |
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.DW $0000,$0010 ; DEVICE CAPACITY (BLOCKS) |
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.DW 0,0 ; CURRENT LBA |
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; |
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DEVECHO "SCSI: IO=" |
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DEVECHO SCSIBASE |
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DEVECHO ", TGT=" |
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DEVECHO SCSI2_TGT |
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DEVECHO ", LUN=" |
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DEVECHO SCSI2_LUN |
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DEVECHO "\n" |
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#ENDIF |
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; |
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#IF (SCSICNT >= 4) |
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.DB $FE ; DRIVER DEVICE NUMBER (FILLED DYNAMICALLY) |
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.DB SCSIBASE ; IO BASE ADDRESS |
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.DB SCSI3_TGT ; TARGT DEVICE ID |
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.DB 1 << SCSI3_TGT ; TARGET DEVICE BIT PATTERN |
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.DB SCSI3_LUN ; SCSI TARGET LUN |
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.DB SCSI_STNOTRDY ; DEVICE STATUS |
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.DW $0000,$0010 ; DEVICE CAPACITY (BLOCKS) |
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.DW 0,0 ; CURRENT LBA |
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; |
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DEVECHO "SCSI: IO=" |
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DEVECHO SCSIBASE |
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DEVECHO ", TGT=" |
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DEVECHO SCSI3_TGT |
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DEVECHO ", LUN=" |
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DEVECHO SCSI3_LUN |
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DEVECHO "\n" |
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#ENDIF |
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; |
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#IF ($ - SCSI_CFGTBL) != (SCSICNT * SCSI_CFGSIZ) |
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.ECHO "*** INVALID SCSI CONFIG TABLE ***\n" |
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#ENDIF |
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@ -145,10 +189,6 @@ SCSI_INIT: |
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RET ; AND BAIL OUT |
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; |
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SCSI_INIT1: |
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PRTS(" TGT_ID=$") ; LABEL FOR IO ADDRESS |
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LD A,SCSI_TID ; GET IO BASE ADDRES |
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CALL PRTDEC8 ; DISPLAY IT |
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; |
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XOR A ; ZERO ACCUM |
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LD (SCSI_DEVNUM),A ; INIT DEV UNIT NUM FOR DYNAMIC ASSIGNMENT |
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LD IY,SCSI_CFGTBL ; POINT TO START OF CONFIG TABLE |
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@ -178,6 +218,10 @@ SCSI_INIT3: |
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CALL DIO_ADDENT ; ADD ENTRY TO GLOBAL DISK DEV TABLE |
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; |
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CALL SCSI_PRTPREFIX ; TAG FOR ACTIVE DEVICE |
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; |
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PRTS(" TGT=$") ; LABEL FOR TARGET DEVICE |
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LD A,(IY+SCSI_TGT) ; GET TARGET DEVICE |
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CALL PRTDEC8 ; DISPLAY IT |
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; |
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PRTS(" LUN=$") ; LUN LABEL |
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LD A,(IY+SCSI_LUN) ; LOAD LUN |
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@ -529,6 +573,8 @@ SCSI_CAPACITY: |
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SCSI_GO: |
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PUSH IX ; PRESERVE IX |
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LD IX,SCSI_S_IOT ; POINT TO IO TABLE |
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LD A,(IY+SCSI_TID) ; GET TARGET ID |
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LD (IX),A ; PUT IN IOT |
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CALL SCSI_GO1 ; RUN THE TRANSACTION |
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POP IX ; RESTORE IX |
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AND %00111110 ; IGNORE RESERVED BITS OF STATUS |
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@ -536,246 +582,248 @@ SCSI_GO: |
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RET ; DONE |
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; |
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;------------------------------------------------------------------------------- |
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;DO SCSI TRANSACTION |
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; DO SCSI TRANSACTION |
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;------------------------------------------------------------------------------- |
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; |
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SCSI_GO1: |
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LD A,$FF ;PRESET ERROR STATUS |
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LD L,(IX+4) ;POINT TO STATUS ADDRESS |
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LD H,(IX+5) ;POINT TO STATUS ADDRESS |
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LD (HL),A ;SET ERROR |
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; |
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XOR A ; |
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OUT (SCSI_SR_MR),A ;RESET CONTROL REG |
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OUT (SCSI_SR_TCR),A ;CLEAR COMMAND REG. |
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OUT (SCSI_SR_ICR),A ; |
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LD A,(IX) ;GET TID |
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BIT 7,A ; TURN ON MY ID |
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OUT (SCSI_SR_ODR),A ;SET TARGET ID |
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LD A,$01 ;DRIVE BUS |
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OUT (SCSI_SR_ICR),A ; |
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LD A,$05 ;SET SEL AND DRIVE BUS |
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OUT (SCSI_SR_ICR),A ; |
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; |
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;WAIT FOR SCSI BUSY |
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LD BC,0 ;INIT TIMEOUT |
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LD A,$FF ; PRESET ERROR STATUS |
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LD L,(IX+4) ; POINT TO STATUS ADDRESS |
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LD H,(IX+5) ; POINT TO STATUS ADDRESS |
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LD (HL),A ; SET ERROR |
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; |
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XOR A ; |
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OUT (SCSI_SR_MR),A ; RESET CONTROL REG |
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OUT (SCSI_SR_TCR),A ; CLEAR COMMAND REG. |
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OUT (SCSI_SR_ICR),A ; |
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LD A,(IX) ; GET TID |
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BIT 7,A ; TURN ON MY ID |
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OUT (SCSI_SR_ODR),A ; SET TARGET ID |
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LD A,$01 ; DRIVE BUS |
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OUT (SCSI_SR_ICR),A ; |
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LD A,$05 ; SET SEL AND DRIVE BUS |
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OUT (SCSI_SR_ICR),A ; |
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; |
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; WAIT FOR SCSI BUSY |
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LD BC,0 ; INIT TIMEOUT |
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S_SWT: |
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IN A,(SCSI_SR_CSBS) ;GET BUS STATUS |
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AND SCSI_SM_BSY ;MASK TO BUSY BIT |
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JR NZ,S_BSYA ;JMP IF BUSY ACTIVE |
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NOP ;KILL A LITTLE TIME |
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IN A,(SCSI_SR_CSBS) ; GET BUS STATUS |
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AND SCSI_SM_BSY ; MASK TO BUSY BIT |
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JR NZ,S_BSYA ; JMP IF BUSY ACTIVE |
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NOP ; KILL A LITTLE TIME |
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NOP |
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NOP |
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NOP |
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DEC BC ;DEC TIMEOUT |
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LD A,B ;TEST TIMEOUT=0 |
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DEC BC ; DEC TIMEOUT |
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LD A,B ; TEST TIMEOUT=0 |
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OR C |
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JR NZ,S_SWT ;JMP IF NO TIMEOUT |
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XOR A ;CLEAR A |
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OUT (SCSI_SR_ICR),A ;CLEAR SEL AND DATA |
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JR S_EXIT ;ERROR EXIT |
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JR NZ,S_SWT ; JMP IF NO TIMEOUT |
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XOR A ; CLEAR A |
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OUT (SCSI_SR_ICR),A ; CLEAR SEL AND DATA |
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JR S_EXIT ; ERROR EXIT |
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; |
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;BUSY IS ACTIVE |
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S_BSYA: |
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XOR A ;CLEAR A |
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OUT (SCSI_SR_ICR),A ;CLEAR SEL AND DATA |
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XOR A ; CLEAR A |
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OUT (SCSI_SR_ICR),A ; CLEAR SEL AND DATA |
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; |
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;------------------------------------------------------------------------------- |
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; |
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;TARGET IS SELECTED SO TEST BSY AND REQ |
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;THEN DECODE REQUESTED PHASE |
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; TARGET IS SELECTED SO TEST BSY AND REQ |
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; THEN DECODE REQUESTED PHASE |
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; |
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;------------------------------------------------------------------------------- |
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PHASE: |
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XOR A |
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OUT (SCSI_SR_ICR),A ;RESET INITIATOR |
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OUT (SCSI_SR_ICR),A ; RESET INITIATOR |
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; |
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S_WTREQ: |
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IN A,(SCSI_SR_CSBS) ;GET BUS STATUS |
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LD B,A ;SAVE COPY |
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AND SCSI_SM_BSY ;MASK TO BUSY BIT |
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JR NZ,S_WTRQ1 ;STILL BUSY SO CONT. |
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IN A,(SCSI_SR_CSBS) ; GET BUS STATUS |
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LD B,A ; SAVE COPY |
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AND SCSI_SM_BSY ; MASK TO BUSY BIT |
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JR NZ,S_WTRQ1 ; STILL BUSY SO CONT. |
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; |
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;------------------------------------------------------------------------------- |
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;BUSY LOST SO EXIT |
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; BUSY LOST SO EXIT |
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;------------------------------------------------------------------------------- |
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S_EXIT: |
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LD L,(IX+4) ;GET STATUS POINTER |
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LD H,(IX+5) ;GET STATUS POINTER |
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LD L,(IX+4) ; GET STATUS POINTER |
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LD H,(IX+5) ; GET STATUS POINTER |
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LD A,(HL) |
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RET ;BUSY LOST? WERE DONE |
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RET ; BUSY LOST? WERE DONE |
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; |
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S_WTRQ1: |
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LD A,B ;RECOVER STATUS |
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AND SCSI_SM_REQ ;REQUEST ACTIVE? |
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JR Z,S_WTREQ ;LOOP TILL REQUEST |
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LD A,B ; RECOVER STATUS |
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AND SCSI_SM_REQ ; REQUEST ACTIVE? |
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JR Z,S_WTREQ ; LOOP TILL REQUEST |
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;------------------------------------------------------------------------------- |
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;REQUEST IS ACTIVE SO SET 5380 TO REQUESTED PHASE |
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; REQUEST IS ACTIVE SO SET 5380 TO REQUESTED PHASE |
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;------------------------------------------------------------------------------- |
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LD A,B ;RECOVER BUS STATUS |
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RR A ;SHIFT STATUS TO PHASE BITS |
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LD A,B ; RECOVER BUS STATUS |
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RR A ; SHIFT STATUS TO PHASE BITS |
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RR A |
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AND $07 ;MASK TO PHASE BITS |
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OUT (SCSI_SR_TCR),A ;SET PHASE |
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AND $07 ; MASK TO PHASE BITS |
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OUT (SCSI_SR_TCR),A ; SET PHASE |
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; |
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;JUMP TO PHASE HANDLER |
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; JUMP TO PHASE HANDLER |
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; |
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LD A,B ;RECOVER BUS STATUS |
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LD A,B ; RECOVER BUS STATUS |
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RR A |
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AND $0E ;MASK TO PHASE BITS |
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LD E,A ; |
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AND $0E ; MASK TO PHASE BITS |
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LD E,A ; |
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LD D,0 |
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LD HL,PHTABL ;POINT TO TABLE |
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ADD HL,DE ;OFFSET INTO TABLE |
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LD E,(HL) ;GET EXECUTION ADDRESS |
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LD HL,PHTABL ; POINT TO TABLE |
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ADD HL,DE ; OFFSET INTO TABLE |
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LD E,(HL) ; GET EXECUTION ADDRESS |
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INC HL |
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LD D,(HL) |
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PUSH DE |
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RET ;EXECUTE PHASE |
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RET ; EXECUTE PHASE |
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; |
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;------------------------------------------------------------------------------- |
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;PHASE TABLE |
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; PHASE TABLE |
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;------------------------------------------------------------------------------- |
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; |
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PHTABL: |
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.WORD PHASE0 ;DATA OUT |
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.WORD PHASE1 ;DATA IN |
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.WORD PHASE2 ;CMD OUT |
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.WORD PHASE3 ;STATUS IN |
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.WORD S_EXIT ;UNUSED |
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.WORD S_EXIT ;UNUSED |
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.WORD PHASE6 ;MESSAGE OUT |
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.WORD PHASE7 ;MESSAGE IN |
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.WORD PHASE0 ; DATA OUT |
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.WORD PHASE1 ; DATA IN |
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.WORD PHASE2 ; CMD OUT |
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.WORD PHASE3 ; STATUS IN |
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.WORD S_EXIT ; UNUSED |
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.WORD S_EXIT ; UNUSED |
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.WORD PHASE6 ; MESSAGE OUT |
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.WORD PHASE7 ; MESSAGE IN |
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; |
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;------------------------------------------------------------------------------- |
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;PHASE HANDLERS |
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;------------------------------------------------------------------------------- |
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; |
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;DATA OUT |
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; DATA OUT |
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PHASE0: |
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LD L,(IX+6) ;GET POINTER |
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LD L,(IX+6) ; GET POINTER |
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LD H,(IX+7) |
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JP S_WRIT ;WRITE BYTES |
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JP S_WRIT ; WRITE BYTES |
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; |
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;DATA IN |
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; DATA IN |
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PHASE1: |
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LD L,(IX+8) ;GET POINTER |
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LD L,(IX+8) ; GET POINTER |
|
|
|
LD H,(IX+9) |
|
|
|
JP S_READ ;READ BYTES |
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|
|
JP S_READ ; READ BYTES |
|
|
|
; |
|
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|
;CMD OUT |
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|
; CMD OUT |
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|
PHASE2: |
|
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|
LD L,(IX+2) |
|
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|
LD H,(IX+3) |
|
|
|
JP S_WRIT |
|
|
|
; |
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|
;STATUS IN |
|
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; STATUS IN |
|
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PHASE3: |
|
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LD L,(IX+4) |
|
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|
LD H,(IX+5) |
|
|
|
JP S_READ |
|
|
|
; |
|
|
|
;MSG OUT |
|
|
|
; MSG OUT |
|
|
|
PHASE6: |
|
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|
LD L,(IX+10) |
|
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|
LD H,(IX+11) |
|
|
|
JP S_WRIT |
|
|
|
; |
|
|
|
;MSG IN |
|
|
|
; MSG IN |
|
|
|
PHASE7: |
|
|
|
LD L,(IX+12) |
|
|
|
LD H,(IX+13) |
|
|
|
JP S_READ |
|
|
|
; |
|
|
|
;------------------------------------------------------------------------------- |
|
|
|
;SCSI WRITE ROUTINE (SEND BYTES TO TARGET) |
|
|
|
;BUS PHASE ALREADY SET. RETURN ON PHASE MISMATCH |
|
|
|
; SCSI WRITE ROUTINE (SEND BYTES TO TARGET) |
|
|
|
; BUS PHASE ALREADY SET. RETURN ON PHASE MISMATCH |
|
|
|
;------------------------------------------------------------------------------- |
|
|
|
S_WRIT: |
|
|
|
LD A,1 ;DRIVE SCSI DATA BUS |
|
|
|
LD A,1 ; DRIVE SCSI DATA BUS |
|
|
|
OUT (SCSI_SR_ICR),A |
|
|
|
; |
|
|
|
;WAIT FOR REQ WHILE CHECKING BUSY |
|
|
|
; WAIT FOR REQ WHILE CHECKING BUSY |
|
|
|
; |
|
|
|
S_WWREQ: |
|
|
|
IN A,(SCSI_SR_CSBS) ;GET CURRENT BUS STAT |
|
|
|
LD B,A ;SAVE IT |
|
|
|
AND SCSI_SM_REQ ;REQUEST ACTIVE? |
|
|
|
JR NZ,S_WNXT ; |
|
|
|
IN A,(SCSI_SR_CSBS) ; GET CURRENT BUS STAT |
|
|
|
LD B,A ; SAVE IT |
|
|
|
AND SCSI_SM_REQ ; REQUEST ACTIVE? |
|
|
|
JR NZ,S_WNXT ; |
|
|
|
; |
|
|
|
LD A,B ;RECOVER CURRENT BUS STAT |
|
|
|
AND SCSI_SM_BSY ;STILL BUSY? |
|
|
|
JP NZ,S_WWREQ ;LOOP IF STILL BUSY |
|
|
|
JP PHASE ; |
|
|
|
LD A,B ; RECOVER CURRENT BUS STAT |
|
|
|
AND SCSI_SM_BSY ; STILL BUSY? |
|
|
|
JP NZ,S_WWREQ ; LOOP IF STILL BUSY |
|
|
|
JP PHASE ; |
|
|
|
; |
|
|
|
;REQUEST ACTIVE SO CHECK PHASE |
|
|
|
; REQUEST ACTIVE SO CHECK PHASE |
|
|
|
; |
|
|
|
S_WNXT: |
|
|
|
IN A,(SCSI_SR_BSR) ;GET STATUS |
|
|
|
AND SCSI_SM_PHM ;MASK TO PHASE MATCH |
|
|
|
JP Z,PHASE ;JMP IF PHASE MISMATCH |
|
|
|
IN A,(SCSI_SR_BSR) ; GET STATUS |
|
|
|
AND SCSI_SM_PHM ; MASK TO PHASE MATCH |
|
|
|
JP Z,PHASE ; JMP IF PHASE MISMATCH |
|
|
|
; |
|
|
|
;REQUEST ACTIVE AND PHASE MATCH SO SEND DATA |
|
|
|
; REQUEST ACTIVE AND PHASE MATCH SO SEND DATA |
|
|
|
; |
|
|
|
LD A,(HL) ;GET BYTE |
|
|
|
OUT (SCSI_SR_ODR),A ;SEND DATA |
|
|
|
LD A,$11 ;ACK + DRIVE BUS |
|
|
|
OUT (SCSI_SR_ICR),A ;SET ACK,DRIVE SCSI BUS |
|
|
|
INC HL ;ADVANCE BUF POINTER |
|
|
|
LD A,(HL) ; GET BYTE |
|
|
|
OUT (SCSI_SR_ODR),A ; SEND DATA |
|
|
|
LD A,$11 ; ACK + DRIVE BUS |
|
|
|
OUT (SCSI_SR_ICR),A ; SET ACK,DRIVE SCSI BUS |
|
|
|
INC HL ; ADVANCE BUF POINTER |
|
|
|
; |
|
|
|
;WAIT FOR REQUEST TO DROP |
|
|
|
; WAIT FOR REQUEST TO DROP |
|
|
|
; |
|
|
|
S_WNREQ: |
|
|
|
IN A,(SCSI_SR_CSBS) ;GET CURRENT STATUS |
|
|
|
IN A,(SCSI_SR_CSBS) ; GET CURRENT STATUS |
|
|
|
AND SCSI_SM_REQ |
|
|
|
JR NZ,S_WNREQ ;LOOP TILL REQ DROPS |
|
|
|
JR NZ,S_WNREQ ; LOOP TILL REQ DROPS |
|
|
|
; |
|
|
|
LD A,$1 ;DROP ACK,ASSERT DATA |
|
|
|
OUT (SCSI_SR_ICR),A ;DROP ACK |
|
|
|
JP S_WWREQ ;LOOP FOR NEXT BYTE/PHASE |
|
|
|
LD A,$1 ; DROP ACK,ASSERT DATA |
|
|
|
OUT (SCSI_SR_ICR),A ; DROP ACK |
|
|
|
JP S_WWREQ ; LOOP FOR NEXT BYTE/PHASE |
|
|
|
;------------------------------------------------------------------------------- |
|
|
|
;SCSI READ ROUTINE (GET BYTES FROM TARGET) |
|
|
|
;BUS PHASE ALREADY SET. RETURN ON PHASE MISMATCH |
|
|
|
; SCSI READ ROUTINE (GET BYTES FROM TARGET) |
|
|
|
; BUS PHASE ALREADY SET. RETURN ON PHASE MISMATCH |
|
|
|
;------------------------------------------------------------------------------- |
|
|
|
; |
|
|
|
S_READ: |
|
|
|
; |
|
|
|
;WAIT FOR REQ WHILE CHECKING BUSY |
|
|
|
; WAIT FOR REQ WHILE CHECKING BUSY |
|
|
|
; |
|
|
|
S_RWREQ: |
|
|
|
IN A,(SCSI_SR_CSBS) ;GET CURRENT BUS STAT |
|
|
|
LD B,A ;SAVE IT |
|
|
|
AND SCSI_SM_REQ ;REQUEST ACTIVE? |
|
|
|
JR NZ,S_RNXT ; |
|
|
|
IN A,(SCSI_SR_CSBS) ; GET CURRENT BUS STAT |
|
|
|
LD B,A ; SAVE IT |
|
|
|
AND SCSI_SM_REQ ; REQUEST ACTIVE? |
|
|
|
JR NZ,S_RNXT ; |
|
|
|
; |
|
|
|
LD A,B ; RECOVER CURRENT BUS STAT |
|
|
|
AND SCSI_SM_BSY ; STILL BUSY? |
|
|
|
JP NZ,S_RWREQ ; LOOP IF STIL BUSY |
|
|
|
JP PHASE ; |
|
|
|
; |
|
|
|
LD A,B ;RECOVER CURRENT BUS STAT |
|
|
|
AND SCSI_SM_BSY ;STILL BUSY? |
|
|
|
JP NZ,S_RWREQ ;LOOP IF STIL BUSY |
|
|
|
JP PHASE ; |
|
|
|
; REQUEST ACTIVE SO CHECK PHASE |
|
|
|
; |
|
|
|
;REQUEST ACTIVE SO CHECK PHASE |
|
|
|
S_RNXT: |
|
|
|
IN A,(SCSI_SR_BSR) ;GET STATUS |
|
|
|
AND SCSI_SM_PHM ;MASK TO PHASE MATCH |
|
|
|
JP Z,PHASE ;JMP IF PHASE MISMATCH |
|
|
|
|
|
|
|
;REQUEST ACTIVE AND PHASE MATCH SO GET DATA |
|
|
|
IN A,(SCSI_SR_BSR) ; GET STATUS |
|
|
|
AND SCSI_SM_PHM ; MASK TO PHASE MATCH |
|
|
|
JP Z,PHASE ; JMP IF PHASE MISMATCH |
|
|
|
; |
|
|
|
IN A, (SCSI_SR_CSD) ;GET DATA |
|
|
|
LD (HL),A ;SAVE DATA |
|
|
|
; REQUEST ACTIVE AND PHASE MATCH SO GET DATA |
|
|
|
; |
|
|
|
IN A, (SCSI_SR_CSD) ; GET DATA |
|
|
|
LD (HL),A ; SAVE DATA |
|
|
|
LD A,$10 |
|
|
|
OUT (SCSI_SR_ICR),A ;SET ACK |
|
|
|
INC HL ;ADVANCE BUF POINTER |
|
|
|
OUT (SCSI_SR_ICR),A ; SET ACK |
|
|
|
INC HL ; ADVANCE BUF POINTER |
|
|
|
; |
|
|
|
;WAIT FOR REQUEST TO DROP |
|
|
|
; |
|
|
|
S_RNREQ: |
|
|
|
IN A,(SCSI_SR_CSBS) ;GET CURRENT STATUS |
|
|
|
IN A,(SCSI_SR_CSBS) ; GET CURRENT STATUS |
|
|
|
AND SCSI_SM_REQ |
|
|
|
JR NZ,S_RNREQ ;LOOP TILL REQ DROPS |
|
|
|
JR NZ,S_RNREQ ; LOOP TILL REQ DROPS |
|
|
|
XOR A |
|
|
|
OUT (SCSI_SR_ICR),A ;DROP ACK |
|
|
|
JP S_READ ;LOOP FOR NEXT BYTE/PHASE |
|
|
|
|
|
|
|
OUT (SCSI_SR_ICR),A ; DROP ACK |
|
|
|
JP S_READ ; LOOP FOR NEXT BYTE/PHASE |
|
|
|
; |
|
|
|
;============================================================================= |
|
|
|
; HARDWARE INTERFACE ROUTINES |
|
|
|
@ -935,7 +983,7 @@ SCSI_CAP_LUN .DB 0 << 5 ; LUN (TOP 3 BITS) |
|
|
|
;SCSI I/O ADDRESS TABLE FOR READ/WRITE |
|
|
|
;DONT MESS WITH THIS EITHER |
|
|
|
SCSI_S_IOT: |
|
|
|
SCSI_CUR_TID .DB 1 << SCSI_TID ; TARGET |
|
|
|
SCSI_CUR_TID .DB 0 ; TARGET (FILLED DYNAMICALLY) |
|
|
|
.DB 0 ; UNUSED |
|
|
|
SCSI_CUR_CDB .DW SCSI_S_CDB ; CDB POINTER |
|
|
|
.DW SCSI_S_STAT ; STATUS POINTER |
|
|
|
|