*
|
*
|
** FLEX 9 DISK DRIVERS
|
** FLEX 9 DISK DRIVERS
|
** FOR SINGLE/DOUBLE SIDED 5" DRIVES ONLY.
|
** FOR SINGLE/DOUBLE SIDED 5" DRIVES ONLY.
|
** USING FD1771.
|
** USING FD1771.
|
** SIDES MAY BE TREATED AS SEPERATE DISKS.
|
** SIDES MAY BE TREATED AS SEPERATE DISKS.
|
**
|
**
|
** BY J.E.KENT 1 JAN 1982
|
** BY J.E.KENT 1 JAN 1982
|
*
|
*
|
*
|
*
|
** F.D. CONTROLLER
|
** F.D. CONTROLLER
|
*
|
*
|
DRVREG EQU $E014
|
DRVREG EQU $E014
|
MOTOR EQU %10000000
|
MOTOR EQU %10000000
|
SIDESL EQU %01000000
|
SIDESL EQU %01000000
|
DRIVSL EQU %00000001
|
DRIVSL EQU %00000001
|
CMDREG EQU $E018
|
CMDREG EQU $E018
|
TRKREG EQU $E019
|
TRKREG EQU $E019
|
SECREG EQU $E01A
|
SECREG EQU $E01A
|
DATREG EQU $E01B
|
DATREG EQU $E01B
|
*
|
*
|
** FD1771 DISK CONTROLLER INSTRUCTIONS
|
** FD1771 DISK CONTROLLER INSTRUCTIONS
|
*
|
*
|
** TYPE I INSTRUCTIONS:
|
** TYPE I INSTRUCTIONS:
|
*
|
*
|
IREST EQU $00 RESTORE (SEEK TRACK 0)
|
IREST EQU $00 RESTORE (SEEK TRACK 0)
|
ISEEK EQU $10 SEEK TRACK
|
ISEEK EQU $10 SEEK TRACK
|
ISTEP EQU $20 STEP ONE TRACK (IN/OUT)
|
ISTEP EQU $20 STEP ONE TRACK (IN/OUT)
|
ISTIN EQU $40 STEP IN ONE TRACK
|
ISTIN EQU $40 STEP IN ONE TRACK
|
ISTOUT EQU $60 STEP OUT ONE TRACK
|
ISTOUT EQU $60 STEP OUT ONE TRACK
|
*
|
*
|
** BIT FIELDS FOR TYPE I INSTRUCTIONS
|
** BIT FIELDS FOR TYPE I INSTRUCTIONS
|
*
|
*
|
SMR6 EQU $00 6MSEC STEPPING RATE
|
SMR6 EQU $00 6MSEC STEPPING RATE
|
SMR12 EQU $01 12 MSEC STEPPING RATE
|
SMR12 EQU $01 12 MSEC STEPPING RATE
|
SMR20 EQU $02 20 MSEC
|
SMR20 EQU $02 20 MSEC
|
SMR40 EQU $03 40 MSEC
|
SMR40 EQU $03 40 MSEC
|
*
|
*
|
BVERIF EQU $04 VERIFY BIT (1=ON)
|
BVERIF EQU $04 VERIFY BIT (1=ON)
|
BHDLD EQU $08 HEAD LOAD (1=LOAD HEAD AT BEGINING)
|
BHDLD EQU $08 HEAD LOAD (1=LOAD HEAD AT BEGINING)
|
BUPDAT EQU $10 UPDATE TRACK REGISTER (1=TRUE)
|
BUPDAT EQU $10 UPDATE TRACK REGISTER (1=TRUE)
|
*
|
*
|
** TYPE II INSTRUCTIONS
|
** TYPE II INSTRUCTIONS
|
*
|
*
|
IREAD EQU $80 READ SECTOR
|
IREAD EQU $80 READ SECTOR
|
IWRITE EQU $A0 WRITE SECTOR
|
IWRITE EQU $A0 WRITE SECTOR
|
*
|
*
|
** BIT FIELD FOR TYPE II
|
** BIT FIELD FOR TYPE II
|
*
|
*
|
BDAMFB EQU $00 $FB DATA ADDRESS MARK
|
BDAMFB EQU $00 $FB DATA ADDRESS MARK
|
BDAMFA EQU $01 $FA DATA ADDREES MARK
|
BDAMFA EQU $01 $FA DATA ADDREES MARK
|
BDAMF9 EQU $02 $F9 DATA ADDRESS MARK
|
BDAMF9 EQU $02 $F9 DATA ADDRESS MARK
|
BDAMF8 EQU $03 $F8 DATA ADDRESS MARK
|
BDAMF8 EQU $03 $F8 DATA ADDRESS MARK
|
BEHLD EQU $04 ENABLE HLD & 10 MSEC DELAY (1=ACTIVE)
|
BEHLD EQU $04 ENABLE HLD & 10 MSEC DELAY (1=ACTIVE)
|
BBLEN EQU $08 BLOCK LENGTH (1=IBM FORMAT 128 - 1024 BYTES)
|
BBLEN EQU $08 BLOCK LENGTH (1=IBM FORMAT 128 - 1024 BYTES)
|
BMREC EQU $10 MULTIPLE RECORD (0=SINGLE, 1=MULTIPLE)
|
BMREC EQU $10 MULTIPLE RECORD (0=SINGLE, 1=MULTIPLE)
|
*
|
*
|
** TYPE III INSTRUCTIONS
|
** TYPE III INSTRUCTIONS
|
*
|
*
|
IRDADD EQU $C4 READ ADDRESS
|
IRDADD EQU $C4 READ ADDRESS
|
IRDTRK EQU $E4 READ TRACK
|
IRDTRK EQU $E4 READ TRACK
|
IWRTRK EQU $F4 WRITE TRACK
|
IWRTRK EQU $F4 WRITE TRACK
|
*
|
*
|
** BIT FIELD TYPE III (READ TRACK ONLY)
|
** BIT FIELD TYPE III (READ TRACK ONLY)
|
*
|
*
|
BSYNC EQU $01 SYNCRONIZE FLAG (0=SYNC TO AM)
|
BSYNC EQU $01 SYNCRONIZE FLAG (0=SYNC TO AM)
|
*
|
*
|
** TYPE IV NSTRUCTION
|
** TYPE IV NSTRUCTION
|
*
|
*
|
IFINTR EQU $D0 FORCE INTERRUPT
|
IFINTR EQU $D0 FORCE INTERRUPT
|
*
|
*
|
** FORCED INTERRUPT BITS (TYPE IV INSTRUCTION)
|
** FORCED INTERRUPT BITS (TYPE IV INSTRUCTION)
|
*
|
*
|
FI0 EQU $01 NOT READY TO READY TRANSITION
|
FI0 EQU $01 NOT READY TO READY TRANSITION
|
FI1 EQU $02 READY TO NOT READY TRANSITION
|
FI1 EQU $02 READY TO NOT READY TRANSITION
|
FI2 EQU $04 INDEX PULSE
|
FI2 EQU $04 INDEX PULSE
|
FI3 EQU $08 EVERY 10 MSEC
|
FI3 EQU $08 EVERY 10 MSEC
|
*
|
*
|
** DISK DRIVER PATCHES
|
** DISK DRIVER PATCHES
|
*
|
*
|
ORG $DE00
|
ORG $DE00
|
*
|
*
|
** JUMP TABLE TO DISK DRIVERS
|
** JUMP TABLE TO DISK DRIVERS
|
*
|
*
|
READ JMP READSC
|
READ JMP READSC
|
WRITE JMP WRITSC
|
WRITE JMP WRITSC
|
VERIFY JMP VERIF1
|
VERIFY JMP VERIF1
|
RESTOR JMP RESTR1
|
RESTOR JMP RESTR1
|
DRIVE JMP DRVSEL
|
DRIVE JMP DRVSEL
|
DRVRDY JMP CHKDRV
|
DRVRDY JMP CHKDRV
|
QUICK JMP CHKDRV
|
QUICK JMP CHKDRV
|
COLDDR JMP INITDR
|
COLDDR JMP INITDR
|
WARMDR JMP WARMD1
|
WARMDR JMP WARMD1
|
SEEK JMP SEEK1
|
SEEK JMP SEEK1
|
*
|
*
|
** CURRNT DRIVE NUMBER ($DE1E)
|
** CURRNT DRIVE NUMBER ($DE1E)
|
*
|
*
|
CURDRV FCB $00
|
CURDRV FCB $00
|
*
|
*
|
** HEAD POSITION TABLE ($DE1F)
|
** HEAD POSITION TABLE ($DE1F)
|
*
|
*
|
TRKTBL FCB $00 DRIVE 0
|
TRKTBL FCB $00 DRIVE 0
|
FCB $00 DRIVE 1
|
FCB $00 DRIVE 1
|
FCB $00 DRIVE 2
|
FCB $00 DRIVE 2
|
FCB $00 DRIVE 3
|
FCB $00 DRIVE 3
|
*
|
*
|
** ??? ($DE23)
|
** ??? ($DE23)
|
*
|
*
|
FCB 0
|
FCB 0
|
*
|
*
|
** DENSITY TABLE: ($DE24)
|
** DENSITY TABLE: ($DE24)
|
** HOLDS SECTORS/TRACK FOR DRIVE
|
** HOLDS SECTORS/TRACK FOR DRIVE
|
** 5" SINGLE DENSITY => 10 SECTORS/TRACK
|
** 5" SINGLE DENSITY => 10 SECTORS/TRACK
|
*
|
*
|
DNSTBL FCB 10,10,10,10 ALL MINIS
|
DNSTBL FCB 10,10,10,10 ALL MINIS
|
*
|
*
|
** DRIVE & DISK CHARACTERISTICS
|
** DRIVE & DISK CHARACTERISTICS
|
*
|
*
|
* BITS 1,0 STEPPING RATES
|
* BITS 1,0 STEPPING RATES
|
* BIT 2 TRACKS/DISK (0=40 TRACK, 1=80 TRACK)
|
* BIT 2 TRACKS/DISK (0=40 TRACK, 1=80 TRACK)
|
* BIT 3 TRACKS/DRIVE (0=40 TRACK, 1=80 TRACK)
|
* BIT 3 TRACKS/DRIVE (0=40 TRACK, 1=80 TRACK)
|
*
|
*
|
BDVTPI EQU $08
|
BDVTPI EQU $08
|
BDKTPI EQU $04
|
BDKTPI EQU $04
|
DDCTBL EQU *
|
DDCTBL EQU *
|
FCB BDVTPI+BDKTPI+SMR6
|
FCB BDVTPI+BDKTPI+SMR6
|
FCB BDVTPI+BDKTPI+SMR6
|
FCB BDVTPI+BDKTPI+SMR6
|
FCB SMR40
|
FCB SMR40
|
FCB SMR40
|
FCB SMR40
|
*
|
*
|
** DISK DRIVERS
|
** DISK DRIVERS
|
*
|
*
|
* DRIVER INITIATION
|
* DRIVER INITIATION
|
*
|
*
|
INITDR LDX #CURDRV
|
INITDR LDX #CURDRV
|
LDB #5
|
LDB #5
|
INITD2 CLR ,X+
|
INITD2 CLR ,X+
|
DECB
|
DECB
|
BNE INITD2
|
BNE INITD2
|
WARMD1 RTS
|
WARMD1 RTS
|
*
|
*
|
* READ ONE SECTOR
|
* READ ONE SECTOR
|
*
|
*
|
READSC BSR SEEK1
|
READSC BSR SEEK1
|
LDA #IREAD+BBLEN+BEHLD
|
LDA #IREAD+BBLEN+BEHLD
|
READ2 ORCC #$10
|
READ2 ORCC #$10
|
* SEI DISABLE INTERRUPTS
|
* SEI DISABLE INTERRUPTS
|
STA CMDREG
|
STA CMDREG
|
LBSR DLY47
|
LBSR DLY47
|
LDB #$00
|
LDB #$00
|
RDLOOP LDA CMDREG
|
RDLOOP LDA CMDREG
|
BITA #$02
|
BITA #$02
|
BNE RDBYTE
|
BNE RDBYTE
|
BITA #$01
|
BITA #$01
|
BNE RDLOOP
|
BNE RDLOOP
|
TFR A,B
|
TFR A,B
|
BRA RDEXIT
|
BRA RDEXIT
|
*
|
*
|
RDBYTE LDA DATREG
|
RDBYTE LDA DATREG
|
STA ,X+
|
STA ,X+
|
DECB
|
DECB
|
BNE RDLOOP
|
BNE RDLOOP
|
BSR WAIT
|
BSR WAIT
|
RDEXIT BITB #$1C
|
RDEXIT BITB #$1C
|
ANDCC #$EF
|
ANDCC #$EF
|
* CLI
|
* CLI
|
RTS
|
RTS
|
*
|
*
|
** WAIT UNTIL CONTROLLER READY
|
** WAIT UNTIL CONTROLLER READY
|
*
|
*
|
WAIT LDB CMDREG
|
WAIT LDB CMDREG
|
BITB #$01
|
BITB #$01
|
BNE WAIT
|
BNE WAIT
|
RTS
|
RTS
|
*
|
*
|
** SEEK1 TRACK AND SECTOR
|
** SEEK1 TRACK AND SECTOR
|
** ACCA = TRACK NUMBER
|
** ACCA = TRACK NUMBER
|
** ACCB = SECTOR NUMBER
|
** ACCB = SECTOR NUMBER
|
*
|
*
|
SEEK1 STB SECREG SET SECTOR
|
SEEK1 STB SECREG SET SECTOR
|
CMPB #10 DOUBLE-SIDED ?
|
CMPB #10 DOUBLE-SIDED ?
|
BHI SEEK2 DOUBLE SIDED, FLIP
|
BHI SEEK2 DOUBLE SIDED, FLIP
|
LDB CURDRV BACK SIDE OF DISK ?
|
LDB CURDRV BACK SIDE OF DISK ?
|
CMPB #1 DRIVE 2-3 BACK SIDE
|
CMPB #1 DRIVE 2-3 BACK SIDE
|
BHI SEEK3
|
BHI SEEK3
|
ANDB #$FF-SIDESL SELECT SIDE 0
|
ANDB #$FF-SIDESL SELECT SIDE 0
|
BRA SEEK4
|
BRA SEEK4
|
*
|
*
|
SEEK2 LDB CURDRV SELECT SIDE 1
|
SEEK2 LDB CURDRV SELECT SIDE 1
|
SEEK3 ANDB #DRIVSL
|
SEEK3 ANDB #DRIVSL
|
ORB #SIDESL
|
ORB #SIDESL
|
SEEK4 STB DRVREG
|
SEEK4 STB DRVREG
|
*
|
*
|
CMPA TRKREG DIFFERENT TO LAST ?
|
CMPA TRKREG DIFFERENT TO LAST ?
|
BEQ FOUND
|
BEQ FOUND
|
PSHS A SAVE TRACK NO. ON STACK
|
PSHS A SAVE TRACK NO. ON STACK
|
*
|
*
|
* IF 80 TRACK DRIVE, & 40 TRACK DISK, FIRST SEEK
|
* IF 80 TRACK DRIVE, & 40 TRACK DISK, FIRST SEEK
|
* SHOULD NOT UPDATE TRACK REGISTER NOR VERIFY.
|
* SHOULD NOT UPDATE TRACK REGISTER NOR VERIFY.
|
*
|
*
|
SUBA TRKREG CALC. DIFFERENCE
|
SUBA TRKREG CALC. DIFFERENCE
|
TFR A,B
|
TFR A,B
|
PSHS Y
|
PSHS Y
|
*
|
*
|
** GET STEPPING RATE FROM TABLE
|
** GET STEPPING RATE FROM TABLE
|
*
|
*
|
LDY #DDCTBL
|
LDY #DDCTBL
|
LDA CURDRV
|
LDA CURDRV
|
ANDA #$01
|
ANDA #$01
|
LDA A,Y
|
LDA A,Y
|
PULS Y
|
PULS Y
|
*
|
*
|
** CHECK DRIVE AND DISK TYPE
|
** CHECK DRIVE AND DISK TYPE
|
*
|
*
|
BITA #BDVTPI DRIVE TRACK DENSITY = 48 TPI ?
|
BITA #BDVTPI DRIVE TRACK DENSITY = 48 TPI ?
|
BEQ SEEKVU YES, SKIP
|
BEQ SEEKVU YES, SKIP
|
BITA #BDKTPI DISK TRACK DENSITY = 96 TPI ?
|
BITA #BDKTPI DISK TRACK DENSITY = 96 TPI ?
|
BNE SEEKVU YES, SKIP (DRIVE & DISK MATCH)
|
BNE SEEKVU YES, SKIP (DRIVE & DISK MATCH)
|
*
|
*
|
** HERE IF 40TRACK DISK IN 80 TRACK DRIVE
|
** HERE IF 40TRACK DISK IN 80 TRACK DRIVE
|
** USE STEP INSTRUCTIONS TO PREVENT UPDATE OF TRACK REG.
|
** USE STEP INSTRUCTIONS TO PREVENT UPDATE OF TRACK REG.
|
*
|
*
|
ANDA #$03 LEAVE STEPPING RATE BITS
|
ANDA #$03 LEAVE STEPPING RATE BITS
|
TSTB
|
TSTB
|
BPL STEPIN
|
BPL STEPIN
|
NEGB
|
NEGB
|
ORA #ISTOUT
|
ORA #ISTOUT
|
BRA STEPLP
|
BRA STEPLP
|
STEPIN ORA #ISTIN
|
STEPIN ORA #ISTIN
|
STEPLP PSHS B
|
STEPLP PSHS B
|
BSR SEEK5
|
BSR SEEK5
|
PULS B
|
PULS B
|
DECB
|
DECB
|
BNE STEPLP
|
BNE STEPLP
|
*
|
*
|
** SEEK TRACK WITH VERIFY & UPDATE
|
** SEEK TRACK WITH VERIFY & UPDATE
|
*
|
*
|
SEEKVU ANDA #$03 RETAIN STEPPING RATE
|
SEEKVU ANDA #$03 RETAIN STEPPING RATE
|
ORA #ISEEK+BHDLD ($18)
|
ORA #ISEEK+BHDLD ($18)
|
PULS B RESTORE DEST TRACK NO.
|
PULS B RESTORE DEST TRACK NO.
|
STB DATREG YES, SEEK1 NEW TRACK
|
STB DATREG YES, SEEK1 NEW TRACK
|
LBSR DLY47
|
LBSR DLY47
|
SEEK5 STA CMDREG
|
SEEK5 STA CMDREG
|
LBSR DLY47
|
LBSR DLY47
|
BSR WAIT
|
BSR WAIT
|
BITB #$10 CHECK FOR SEEK1 ERROR
|
BITB #$10 CHECK FOR SEEK1 ERROR
|
FOUND JMP DLY47
|
FOUND JMP DLY47
|
*
|
*
|
** WRITE SECTOR TO DISK
|
** WRITE SECTOR TO DISK
|
*
|
*
|
WRITSC BSR SEEK1
|
WRITSC BSR SEEK1
|
LDA #IWRITE+BBLEN+BEHLD ($AC)
|
LDA #IWRITE+BBLEN+BEHLD ($AC)
|
WRITE2 ORCC #$10
|
WRITE2 ORCC #$10
|
* SEI
|
* SEI
|
STA CMDREG
|
STA CMDREG
|
LBSR DLY47
|
LBSR DLY47
|
LDB #$00
|
LDB #$00
|
WRLOOP LDA CMDREG
|
WRLOOP LDA CMDREG
|
BITA #$02
|
BITA #$02
|
BNE WRBYTE
|
BNE WRBYTE
|
BITA #$01
|
BITA #$01
|
BNE WRLOOP
|
BNE WRLOOP
|
TFR A,B
|
TFR A,B
|
BRA WREXIT
|
BRA WREXIT
|
*
|
*
|
WRBYTE LDA ,X+
|
WRBYTE LDA ,X+
|
STA DATREG
|
STA DATREG
|
DECB
|
DECB
|
BNE WRLOOP
|
BNE WRLOOP
|
LBSR WAIT
|
LBSR WAIT
|
WREXIT BITB #$5C
|
WREXIT BITB #$5C
|
ANDCC #$EF
|
ANDCC #$EF
|
* CLI
|
* CLI
|
RTS
|
RTS
|
*
|
*
|
** VERIFY SECTOR WRITTEN
|
** VERIFY SECTOR WRITTEN
|
*
|
*
|
VERIF1 LDA #IREAD+BBLEN+BEHLD ($8C)
|
VERIF1 LDA #IREAD+BBLEN+BEHLD ($8C)
|
VERIF2 ORCC #$10
|
VERIF2 ORCC #$10
|
* SEI
|
* SEI
|
STA CMDREG
|
STA CMDREG
|
LBSR DLY47
|
LBSR DLY47
|
LBSR WAIT
|
LBSR WAIT
|
ANDCC #$EF
|
ANDCC #$EF
|
* CLI
|
* CLI
|
BITB #$18
|
BITB #$18
|
RTS
|
RTS
|
*
|
*
|
** SEEK TRACK ZERO
|
** SEEK TRACK ZERO
|
*
|
*
|
RESTR1 PSHS X
|
RESTR1 PSHS X
|
BSR DRVSEL
|
BSR DRVSEL
|
LDX #DDCTBL
|
LDX #DDCTBL
|
LDA CURDRV
|
LDA CURDRV
|
ANDA #1
|
ANDA #1
|
LDA A,X
|
LDA A,X
|
ANDA #$03
|
ANDA #$03
|
ORA #IREST+BHDLD
|
ORA #IREST+BHDLD
|
STA CMDREG
|
STA CMDREG
|
BSR DLY47
|
BSR DLY47
|
LBSR WAIT
|
LBSR WAIT
|
BITB #$D8 CHECK FOR ERROR
|
BITB #$D8 CHECK FOR ERROR
|
PULS X,PC
|
PULS X,PC
|
*
|
*
|
** SELECT DRIVE
|
** SELECT DRIVE
|
** IX -> FCB
|
** IX -> FCB
|
** ACCA = NEW DRIVE NUMBER
|
** ACCA = NEW DRIVE NUMBER
|
*
|
*
|
* SAVE OLD TRACK NUMBER IN TABLE
|
* SAVE OLD TRACK NUMBER IN TABLE
|
* AND SET UP TRACK FOR NEW DRIVE
|
* AND SET UP TRACK FOR NEW DRIVE
|
*
|
*
|
*
|
*
|
DRVSEL LDA 3,X
|
DRVSEL LDA 3,X
|
CMPA #3
|
CMPA #3
|
BLS DRSEL1
|
BLS DRSEL1
|
LDB #$0F SET ERROR VALUE
|
LDB #$0F SET ERROR VALUE
|
* SEC
|
* SEC
|
ORCC #$01
|
ORCC #$01
|
RTS
|
RTS
|
*
|
*
|
* SAVE TRACK POSITION OF PREVIOUS DRIVE
|
* SAVE TRACK POSITION OF PREVIOUS DRIVE
|
*
|
*
|
DRSEL1 BSR PNTDRV
|
DRSEL1 BSR PNTDRV
|
LDB TRKREG
|
LDB TRKREG
|
STB ,X
|
STB ,X
|
*
|
*
|
* SELECT NEW DRIVE
|
* SELECT NEW DRIVE
|
*
|
*
|
DRSEL3 STA CURDRV MAY BE 0 - 3
|
DRSEL3 STA CURDRV MAY BE 0 - 3
|
CMPA #1
|
CMPA #1
|
BLS DRSEL4 ONE DIRECTORY ?
|
BLS DRSEL4 ONE DIRECTORY ?
|
ANDA #DRIVSL ROUND OFF
|
ANDA #DRIVSL ROUND OFF
|
ORA #SIDESL SELECT SIDE 1
|
ORA #SIDESL SELECT SIDE 1
|
DRSEL4 STA DRVREG
|
DRSEL4 STA DRVREG
|
*
|
*
|
* RESTORE LAST TRACK POSITION FOR THIS DRIVE
|
* RESTORE LAST TRACK POSITION FOR THIS DRIVE
|
*
|
*
|
BSR PNTDRV
|
BSR PNTDRV
|
LDA ,X
|
LDA ,X
|
STA TRKREG
|
STA TRKREG
|
BSR DLY47
|
BSR DLY47
|
BRA OK
|
BRA OK
|
*
|
*
|
** CHECK IF DRIVE READY
|
** CHECK IF DRIVE READY
|
*
|
*
|
CHKDRV LDA 3,X
|
CHKDRV LDA 3,X
|
CMPA #3
|
CMPA #3
|
BLS OK
|
BLS OK
|
LDB #$80
|
LDB #$80
|
* SEC
|
* SEC
|
ORCC #$01
|
ORCC #$01
|
RTS
|
RTS
|
|
|
OK CLRB
|
OK CLRB
|
* CLC
|
* CLC
|
ANDCC #$FE
|
ANDCC #$FE
|
RTS
|
RTS
|
*
|
*
|
* POINT TO TRACK TABLE ENTRY FOR THIS DRIVE
|
* POINT TO TRACK TABLE ENTRY FOR THIS DRIVE
|
*
|
*
|
PNTDRV LDX #TRKTBL
|
PNTDRV LDX #TRKTBL
|
LDB CURDRV
|
LDB CURDRV
|
ANDB #DRIVSL
|
ANDB #DRIVSL
|
ABX
|
ABX
|
RTS
|
RTS
|
*
|
*
|
** DELAY ROUTINE
|
** DELAY ROUTINE
|
*
|
*
|
DLY47 LBSR DLY19
|
DLY47 LBSR DLY19
|
DLY19 LBSR DLY5US
|
DLY19 LBSR DLY5US
|
DLY5US RTS
|
DLY5US RTS
|
END
|
END
|
|
|
|
|
