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bccas.asm
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* BASICODE 3 for the Sinclair QL
* Part 4: Cassette read/write routines
* Copyright (C) 1986, 1987, 2017 by Jan Bredenbeek
* Released under the GNU Public License, 2017
* Change history:
*
* 19870510 Start of work...
INCLUDE MACRO_LIB
INCLUDE QDOS_IN_MAC
XDEF BUFFER,CAS_OPEN,CAS_CLOSE,CAS_PEND,CAS_FETCH
XDEF CAS_SEND,BCLOAD_T,SAVBLOCK,REPLY
XDEF CLOAD,CSAVE,SAV_KEY,STOPTAPE
XREF.S BUFLEN
XREF GET1INT,PRINTMSG,GET_SCHD,BASPROG,GET_NAME,RECSTRG
SECTION CODE
BUFFER BSR GET1INT
BNE.S BUF_RTS
ADDQ.L #2,$58(A6)
MOVEQ #0,D7
MOVE.W (A6,A1.L),D7
BLE.S ERR_BP
BSR GET_SCHD
BNE.S BUF_RTS
SWAP D7
LSR.L #6,D7
MOVE.L D7,BUFLEN(A0)
MOVEQ #0,D0
BUF_RTS RTS
ERR_BP MOVEQ #ERR.BP,D0
RTS
REPLY LEA YNMSG,A1
BSR PRINTMSG
SECTION MSG
YNMSG STRING$ {'(Y/N) '}
SECTION CODE
MOVEQ #0,D3
REPEAT
QDOS IO.FBYTE
TST.L D0
UNTIL NE
MOVEQ #-1,D3
QDOS SD.CURE
REPEAT
QDOS IO.FBYTE
IF D1 EQ.B #$1B THEN
MOVEQ #'N',D1
ENDIF
ANDI.B #$DF,D1
UNTIL D1 EQ.B #'Y' OR D1 EQ.B #'N'
MOVE.B D1,D2
QDOS SD.CURS
MOVE.B D2,D1
QDOS IO.SBYTE
MOVEQ #10,D1
QDOS IO.SBYTE
CMPI.B #'Y',D2
REP_RTS RTS
BCLOAD_T BSR GET_SCHD
BNE REP_RTS
MOVE.L BUFLEN(A0),D1
MOVEQ #-1,D2
QDOS MT.ALCHP
TST.L D0
BNE.S REP_RTS
MOVE.L A0,A5
MOVE.L D1,-(A7)
SUBA.L A0,A0
LEA STARTMSG,A1
BSR PRINTMSG
MOVEQ #10,D1
QDOS IO.SBYTE
MOVE.L A5,A1
MOVEQ #-$10,D2
ADD.L (A7)+,D2
TRAP #0
BSR LDBLOCK
ANDI #$DFFF,SR
MOVE.L D0,-(A7)
ADDQ.L #1,D0
IF NE THEN
BSR STOPTAPE
ENDIF
MOVE.L (A7)+,D0
MOVE.L A1,D5
SUB.L A5,D5
MOVE.L A5,A2
CRTOLF CMPI.B #$0D,(A2)
BNE.S CRTOLF_1
SUBQ.B #3,(A2)
CRTOLF_1 ADDQ.W #1,A2
CMPA.L A1,A2
BLO CRTOLF
SAV_ERR MOVE.W UT_ERR0,A2
JSR (A2)
ASKFN SUBA.L A0,A0
LEA OFMSG,A1
BSR PRINTMSG
SECTION MSG
OFMSG STRING$ {'Output file? '}
SECTION CODE
MOVE.L (A6),A1
ADDQ.W #2,A1
MOVEQ #44,D2
MOVEQ #-1,D3
TRAP #4
QDOS IO.FLINE
ADDQ.L #1,D0
BEQ.S QLOAD
SUBA.W D1,A1
SUBQ.W #1,D1
BEQ.S QLOAD
MOVE.W D1,-2(A6,A1.L)
LEA -2(A1),A0
BSR.S OPEN_OUT
BNE ASKFN
MOVE.L D5,D2
MOVE.L A5,A1
MOVEQ #-1,D3
QDOS FS.SAVE
MOVEQ #ERR.BP,D1
CMP.L D1,D0
IF EQ THEN
QDOS IO.SSTRG
ENDIF
MOVE.L D0,D4
QDOS IO.CLOSE
MOVE.L D4,D0
BNE SAV_ERR
QLOAD MOVE.L A5,A0
QDOS MT.RECHP
MOVEQ #0,D0
RTS
OPEN_OUT MOVE.L A0,-(A7)
ASKFN_2 MOVE.L (A7),A0
MOVEQ #-1,D1
MOVEQ #2,D3
TRAP #4
QDOS IO.OPEN
TST.L D0
BEQ.S OO_OK
MOVEQ #ERR.EX,D1
CMP.L D1,D0
BNE.S OO_ERR
SUBA.L A0,A0
MOVE.L (A7),A1
MOVE.W 0(A6,A1.L),D2
ADDQ.W #2,A1
TRAP #4
QDOS IO.SSTRG
LEA EXMSG,A1
BSR PRINTMSG
SECTION MSG
EXMSG STRING$ {' exists, overwrite? '}
SECTION CODE
BSR REPLY
BNE.S OO_FAIL
MOVE.L (A7),A0
MOVEQ #-1,D1
TRAP #4
QDOS IO.DELET
BRA ASKFN_2
OO_ERR MOVE.W UT_ERR0,A2
JSR (A2)
OO_FAIL MOVE.L (A7)+,A0
MOVEQ #-1,D0
RTS
OO_OK ADDQ.W #4,A7
RTS
ITOD_L MOVEM.L D0-D1,-(A7)
IF D1 HS.L #10 THEN
MOVEQ #0,D0
SWAP D1
MOVE.W D1,D0
DIVU #10,D0
SWAP D0
MOVE.W D0,D1
SWAP D1
DIVU #10,D1
MOVE.W D1,D0
SWAP D1
EXG D0,D1
BSR ITOD_L
MOVE.B D0,D1
ENDIF
ADDI.B #'0',D1
MOVE.B D1,0(A6,A1.L)
ADDQ.W #1,A1
ADDQ.W #1,D2
MOVEM.L (A7)+,D0-D1
ITOD_RTS RTS
CLOAD BSR GET_NAME
BNE ITOD_RTS
SUBA.L A0,A0
LEA STARTMSG,A1
BSR PRINTMSG
MOVEQ #10,D1
QDOS IO.SBYTE
MOVE.L (A6),A4
ADDQ.W #2,A4
LD_LOOKH MOVEQ #65,D2
LEA -1(A4),A1
TRAP #0
ADDA.L A6,A1
BSR LDBLOCK
ANDI.W #$DFFF,SR
CMPI.W #ERR.NC,D0
BEQ RECSTRG
TST.L D0
BNE.S LD_LOOKH
ADDQ.B #1,-1(A6,A4.L)
BNE.S LD_LOOKH
SUBA.L A0,A0
MOVEQ #-1,D3
LEA $10(A4),A1
MOVE.W $0E(A6,A4.L),D2
TRAP #4
QDOS IO.SSTRG
MOVEQ #10,D1
QDOS IO.SBYTE
LEA 64(A4),A1
MOVE.L 0(A6,A4.L),D1
MOVEQ #0,D2
BSR ITOD_L
MOVEQ #$20,D0
MOVE.B D0,0(A6,A1.L)
MOVE.B D0,1(A6,A1.L)
SUBA.W D2,A1
ADDQ.W #2,D2
SUBA.L A0,A0
TRAP #4
QDOS IO.SSTRG
MOVEQ #32,D1
MOVE.W BV_CHRIX,A2
JSR (A2)
MOVE.L $58(A6),A1
MOVE.L $3C(A6,A4.L),D1
MOVE.W CN_DATE,A2
JSR (A2)
MOVE.W 0(A6,A1.L),D2
ADDQ.W #2,A1
TRAP #4
QDOS IO.SSTRG
MOVEQ #10,D1
QDOS IO.SBYTE
MOVE.L $58(A6),A1
TST.W 0(A6,A1.L)
IF NE THEN
LEA $0E(A4),A0
MOVEQ #1,D0
MOVE.W UT_CSTR,A2
JSR (A2)
BNE LD_LOOKH
ENDIF
MOVE.L 0(A6,A4.L),D1
ADDQ.L #2,D1
MOVEQ #-1,D2
QDOS MT.ALCHP
TST.L D0
BNE RECSTRG
MOVE.L A0,A5
SUBA.L A0,A0
PRINT {'Loading..',10}
MOVE.L 0(A6,A4.L),D2
ADDQ.L #1,D2
LEA 1(A5),A1
TRAP #0
BSR LDBLOCK
ANDI.W #$DFFF,SR
MOVE.W UT_ERR0,A2
JSR (A2)
BSR STOPTAPE
ASKFN_3 SUBA.L A0,A0
LEA OFMSG,A1
BSR PRINTMSG
LEA $10(A4),A1
MOVEQ #0,D1
MOVE.W $0E(A6,A4.L),D1
ADDA.W D1,A1
MOVEQ #48,D2
MOVEQ #-1,D3
TRAP #4
QDOS IO.EDLIN
CMPI.W #ERR.NC,D0
BEQ.S LDQUIT
SUBQ.W #1,D1
BEQ.S LDQUIT
MOVE.W D1,$0E(A6,A4.L)
LEA $0E(A4),A0
BSR OPEN_OUT
BNE ASKFN_3
MOVE.L A4,A1
MOVEQ #-1,D3
TRAP #4
QDOS FS.HEADS
MOVE.L 0(A6,A4.L),D2
LEA 2(A5),A1
QDOS FS.SAVE
MOVE.L D0,D4
QDOS IO.CLOSE
MOVE.L D4,D0
BEQ.S LDQUIT
MOVE.W UT_ERR0,A2
JSR (A2)
BRA ASKFN_3
LDQUIT MOVE.L D0,D4
MOVE.L A5,A0
QDOS MT.RECHP
MOVE.L D4,D0
BRA RECSTRG
CSAVE BSR GET_NAME
BNE SAVRTS
MOVEQ #-1,D1
MOVEQ #1,D3
TRAP #4
QDOS IO.OPEN
TST.L D0
BNE RECSTRG
MOVE.L (A6),A4
ADDQ.W #2,A4
MOVE.L A4,A1
MOVEQ #64,D2
MOVEQ #-1,D3
TRAP #4
QDOS FS.HEADR
TST.L D0
BNE.S SAVCLOS
MOVE.L A0,A5
MOVE.L 0(A6,A4.L),D1
ADDQ.L #2,D1
MOVEQ #-1,D2
QDOS MT.ALCHP
EXG A0,A5
TST.L D0
BNE.S SAVCLOS
LEA 2(A5),A1
MOVE.L 0(A6,A4.L),D2
MOVEQ #-1,D3
QDOS FS.LOAD
TST.L D0
BNE.S RECBUF
MOVE.L A0,-(A7)
BSR.S SAV_KEY
QDOS MT.RCLCK
MOVE.L D1,$3C(A6,A4.L)
ST -1(A6,A4.L)
MOVEQ #65,D2
LEA -1(A4),A1
TRAP #0
ADDA.L A6,A1
BSR SAVBLOCK
MOVE.L 0(A6,A4.L),D2
ADDQ.L #1,D2
LEA 1(A5),A1
BSR SAVBLOCK
ANDI.W #$DFFF,SR
BSR.S STOPTAPE
MOVE.L (A7)+,A0
MOVEQ #0,D0
RECBUF MOVE.L D0,D4
EXG A0,A5
QDOS MT.RECHP
EXG A0,A5
MOVE.L D4,D0
SAVCLOS MOVE.L D0,D4
QDOS IO.CLOSE
MOVE.L D4,D0
BRA RECSTRG
SAVRTS RTS
SAV_KEY SUBA.L A0,A0
LEA PLRECMSG,A1
BSR PRINTMSG
MOVEQ #-1,D3
QDOS SD.CURE
QDOS IO.FBYTE
QDOS SD.CURS
MOVEQ #10,D1
QDOS IO.SBYTE
LEA SAVMSG,A1
BSR PRINTMSG
MOVEQ #10,D1
QDOS IO.SBYTE
RTS
STOPTAPE LEA IPC_PAR,A3
QDOS MT.IPCOM
RTS
IPC_PAR DC.B $0A,8,$55,$55,$AA,$AA,5,5,0,0,144,13,0,0,1
* CASSETTE I/O DEVICE DRIVER
CAS_DIR EQU $18 DIRECTION: <=0 INPUT, >0 OUTPUT
CAS_BLK EQU $19 BLOCK NUMBER
CAS_BPOS EQU $1A CURRENT POSITION IN BUFFER
CAS_BSOH EQU $1C START OF SENT DATABLOCK (CONTAINS SOH CHR)
CAS_BBLK EQU $1D BUFFER BLOCK NUMBER
CAS_BDAT EQU $1E START OF 1024-BYTE DATABUFFER
CAS_BETX EQU $41E END OF DATABUFFER - CONTAINS ETX CHR
CAS_LEN EQU $420 LENGTH OF CAS CHANNEL
CAS_OPEN SUBQ.W #2,A7
MOVE.L A7,A3
MOVE.W IO_NAME,A2
JSR (A2)
BRA.S OP_RTS
BRA.S OP_RTS
BRA.S OP_OK
STRING$ {'CAS'}
DC.W 1
DC.W 2
DC.B 'IO'
OP_OK MOVE.L #CAS_LEN,D1
MOVE.W MM_ALCHP,A2
JSR (A2)
BNE.S OP_RTS
MOVE.B 1(A7),CAS_DIR(A0)
ADDQ.B #1,CAS_BSOH(A0)
ADDQ.B #3,CAS_BETX(A0)
SUBQ.B #1,CAS_DIR(A0)
IF LE THEN
BSR FETCHBUF
ENDIF
OP_RTS ADDQ.W #2,A7
RTS
CAS_CLOSE:
TST.B CAS_DIR(A0)
IF GT THEN
MOVE.W CAS_BPOS(A0),D0
REPEAT
MOVE.B #4,CAS_BDAT(A0,D0.W)
ADDQ.W #1,D0
UNTIL D0 GE.W #$400
BSR.S SENDBUF
ENDIF
BOOT_CL MOVE.W MM_RECHP,A2
JMP (A2)
CAS_PEND TST.B CAS_DIR(A0)
BGT.S CAS_BP
MOVE.W CAS_BPOS(A0),D0
MOVE.B CAS_BDAT(A0,D0.W),D1
IF D0 GE.W #$400 THEN
BSR FETCHBUF
BNE.S CAS_RTS
BRA CAS_PEND
ENDIF
IF D1 EQ.B #$0D THEN
MOVEQ #$0A,D1
ENDIF
CMPI.B #4,D1
BEQ.S CAS_EOF
CAS_OK MOVEQ #0,D0
CAS_RTS RTS
CAS_EOF MOVEQ #ERR.EF,D0
RTS
CAS_BP MOVEQ #ERR.BP,D0
RTS
CAS_FETCH:
BSR CAS_PEND
IF EQ THEN
ADDQ.W #1,CAS_BPOS(A0)
ENDIF
RTS
CAS_SEND TST.B CAS_DIR(A0)
BLE.S CAS_BP
MOVE.W CAS_BPOS(A0),D0
IF D1 EQ.B #$0A THEN
MOVEQ #$0D,D1
ENDIF
MOVE.B D1,CAS_BDAT(A0,D0.W)
ADDQ.W #1,D0
MOVE.W D0,CAS_BPOS(A0)
CMPI.W #$400,D0
BLT CAS_OK
SENDBUF MOVE.B CAS_BLK(A0),CAS_BBLK(A0)
ADDQ.B #1,CAS_BLK(A0)
CLR.W CAS_BPOS(A0)
LEA PLRECMSG,A1
BSR PRMSG
MOVEQ #0,D3
MOVE.L A0,-(A7)
MOVE.L D3,A0
REPEAT
QDOS IO.FBYTE
TST.L D0
UNTIL EQ
MOVE.L (A7)+,A0
LEA SAVMSG,A1
BSR PRMSG
MOVE.L #1027,D2
LEA CAS_BSOH(A0),A1
BSR.S SAVBLOCK
LEA STOPMSG,A1
BSR PRMSG
BSR.S WAIT2S
BRA CLRLN
WAIT2S MOVE.L A0,-(A7)
QDOS MT.INF
CLR.W $30(A0)
REPEAT
UNTIL $30(A0) GE.W #100
MOVE.L (A7)+,A0
RTS
* Save block of bytes
* Entry: D2 length of block, A1 start of block
SAVBLOCK MOVEM.L D2-D7/A0/A2-A4,-(A7)
BSR XMITWAIT
MOVE.L (A7),D2
MOVEQ #0,D5
MOVEQ #7,D6
MOVE.B $A0(A0),D7 SV.TMOD
BSET D6,D7 Bit 7 = NET line
MOVE.W #5999,D3
BSR.S LEADER
MOVEQ #0,D3 Init. checksum
MOVEQ #62,D0 Timing constant
SA_LOOP MOVE.B (A1)+,D1
MOVE.B D1,(A4)
BCHG D6,D1
EOR.B D1,D3
BSR.S SA_BYTE
MOVEQ #61,D0
SUBQ.L #1,D2
BHI.S SA_LOOP
MOVE.B D3,D1
MOVEQ #63,D0
BSR.S SA_BYTE
MOVE.W #1199,D3
BSR.S LEADER
MOVEQ #0,D3
BRA LDEXIT
* Produce leader or trailer tone (2400Hz, all 1s)
LEADER MOVEQ #65,D0
MOVEQ #1,D1
LEAD_1 BSR.S PERIOD
MOVEQ #71,D0
DBF D3,LEAD_1
RTS
* Save byte in D1 (+ 2 stopbits)
SA_BYTE ORI.W #$0300,D1
LSL.W #1,D1 Allow for 1 startbit
SA_BYT1 BSR.S PERIOD
MOVEQ #70,D0
LSR.W #1,D1
BNE.S SA_BYT1
RTS
* Generate 1 period (of 2 if bit is 1)
PERIOD BSR.S HALFPER
BTST D5,D1
BEQ.S P_END
MOVEQ #76,D0
BSR.S HALFPER
BTST D5,D1
BRA.S P_END
HALFPER DBF D0,HALFPER
BTST D5,D1
BNE.S SA_OUT
MOVEQ #85,D0
SA_WAIT DBF D0,SA_WAIT
SA_OUT MOVE.B D7,(A2)
MOVEQ #81,D0
BCHG D6,D7
BEQ.S HALFPER
P_END RTS
PRMSG MOVEM.L D1-D3/A0,-(A7)
MOVE.L A1,-(A7)
SUBA.L A0,A0
MOVEQ #0,D3
SUBQ.W #8,A7
MOVE.L A7,A1
QDOS SD.CHENQ
MOVE.W 2(A7),D2
ADDQ.W #8,A7
SUBQ.W #1,D2
MOVEQ #0,D1
QDOS SD.POS
QDOS SD.CLRLN
MOVE.L (A7)+,A1
BSR PRINTMSG
MOVEM.L (A7)+,D1-D3/A0
RTS
SECTION MSG
PLRECMSG STRING$ {'Press <PLAY> & <REC> then any key..'}
SAVMSG STRING$ {'Saving..'}
STARTMSG STRING$ {'Start tape..'}
STOPMSG STRING$ {'STOP THE TAPE'}
LOBLKMSG STRING$ {'LOW BLOCK - IGNORED'}
HIBLKMSG STRING$ {'HIGH BLOCK - REWIND TAPE'}
LDERRMSG STRING$ {'LOAD ERROR - REWIND TAPE'}
BDATMSG STRING$ {'WARNING - BLOCK CONTAINS BAD DATA'}
NCMSG STRING$ {'not complete',10}
SECTION CODE
F_BRK LEA NCMSG,A2
MOVE.L A2,D0
BSET #31,D0
TST.L D0
RTS
FETCHBUF LEA STARTMSG,A1
BSR PRMSG
F_AGAIN MOVEQ #3,D4
F_ERROR MOVE.L #1027,D2
LEA CAS_BSOH(A0),A1
BSR LDBLOCK
BSR.S CLRLN
ADDQ.L #1,D0
BEQ.S F_BRK
SUBQ.L #1,D0
IF NE OR CAS_BSOH(A0) NE.B #1 THEN
SUBQ.B #1,D4
BLT.S F_BDATA
LEA LDERRMSG,A1
BSR PRMSG
BRA F_ERROR
ENDIF
MOVE.B CAS_BBLK(A0),D0
CMP.B CAS_BLK(A0),D0
BEQ.S F_OK
BHI.S F_HIBLK
LEA LOBLKMSG,A1
BRA.S F_PRMSG
F_HIBLK LEA HIBLKMSG,A1
F_PRMSG BSR PRMSG
BRA F_AGAIN
F_BDATA LEA BDATMSG,A1
BSR PRMSG
BSR WAIT2S
F_OK ADDQ.B #1,CAS_BLK(A0)
CLR.W CAS_BPOS(A0)
LEA CAS_BDAT(A0),A1
MOVE.W #$400,D0
REPEAT
CMPI.B #4,(A1)
BEQ.S F_NXTCHR
CMPI.B #$0D,(A1)
BEQ.S F_NXTCHR
CMPI.B #$20,(A1)
BGE.S F_NXTCHR
MOVE.B #'#',(A1)
F_NXTCHR ADDQ.W #1,A1
SUBQ.W #1,D0
UNTIL EQ
MOVEQ #0,D0
CLRLN MOVEM.L D0-D3/A0-A1,-(A7)
MOVEQ #0,D3
MOVE.L D3,A0
QDOS SD.CLRLN
MOVEQ #0,D1
QDOS SD.TAB
MOVEM.L (A7)+,D0-D3/A0-A1
TST.L D0
RTS
XMITWAIT QDOS MT.INF
REPEAT
TST.B $EE(A0)
UNTIL EQ
REPEAT
SUBQ.W #1,$A6(A0)
EXITIF LT
MOVE.W #$208B,D0
WAIT30MS DBF D0,WAIT30MS
FOREVER
CLR.W $A6(A0)
ORI.B #$18,$A0(A0)
LEA $18020,A3
LEA -$1E(A3),A2
MOVE.B $A0(A0),(A2)
MOVEQ #-1,D1
MOVEQ #-1,D2
QDOS MT.DMODE
LEA $27FC0,A4
ST (A4)
TST.B D1
IF NE THEN
MOVE.B #$AA,(A4)
ENDIF
ADDQ.W #1,A4
ORI #$0700,SR
RTS
LDBLOCK MOVEM.L D2-D7/A0/A2-A4,-(A7)
BSR XMITWAIT
MOVE.L (A7),D2
MOVEQ #59,D5
MOVEQ #1,D6
MOVE.B (A3),D7
LDBRK BSR.S BRKTST
BCS.S EXBRK
MOVEQ #0,D1
BSR EDGE1
BEQ LDBRK
MOVE.W #2400,D4
LD_HEADR BSR EDGE2
BEQ LDBRK
CMPI.B #34,D1
BLO LDBRK
CMP.B D5,D1
BHI LDBRK
DBF D4,LD_HEADR
MOVEQ #0,D3
BSR.S LDSYNC
BRA.S LDSTORE
LDNEXT BSR.S LDBYTE
BEQ.S TSTCHK
LDSTORE SUBQ.L #1,D2
BLO.S LDCHK
BCHG #7,D4
MOVE.B D4,(A4)
MOVE.B D4,(A1)+
BRA LDNEXT
LDCHK BSR.S LDBYTE
BEQ.S TSTCHK
MOVEQ #ERR.BO,D0
BRA.S LDEXIT
EXBRK MOVEQ #ERR.NC,D0
BRA.S LDEXIT
TSTCHK MOVE.L D3,D0
BEQ.S LDEXIT
LEA CKERRMSG,A2
MOVE.L A2,D0
BSET #31,D0
LDEXIT ANDI.B #$E7,$A0(A0)
ANDI #$F8FF,SR
CLR.W -1(A4)
MOVEM.L (A7)+,D2-D7/A0/A2-A4
TST.L D0
RTS
SECTION MSG
CKERRMSG STRING$ {'checksum error',10}
SECTION CODE
BRKTST MOVEM.L D5/D7/A3,-(A7)
LEA CMD_09,A3
QDOS MT.IPCOM
MOVEM.L (A7)+,D5/D7/A3
LSR.B #4,D1
RTS
CMD_09 DC.B 9,1,0,0,0,0,1,2
LDBRK2 BSR BRKTST
BCC.S LDSYNC
ADDQ.W #4,A7
BRA EXBRK
LDSYNC MOVEQ #1,D4
LDSYNC2 MOVEQ #187,D1
BSR.S EDGE1
BEQ LDBRK2
CMPI.B #221,D1
BLO LDSYNC
DBF D4,LDSYNC2
BRA.S LDMARK
LDBYTE MOVEQ #0,D4
LDBYTE1 SUBQ.B #1,D4
BEQ.S LDBYTRTS
BSR.S EDGE2
BEQ LDBRK2
CMP.B D5,D1
BLO LDBYTE1
LDMARK MOVEQ #$80,D4
LDBIT BSR.S EDGE2
BEQ LDBRK2
SUB.B D5,D1
BCC.S LD_0
BSR.S EDGE2
BEQ LDBRK2
SUB.B D5,D1
LD_0 ROXR.B #1,D4
BCC LDBIT
EOR.B D4,D3
MOVEQ #1,D0
LDBYTRTS RTS
EDGE2 MOVEQ #0,D1
BSR.S EDGE1
BEQ.S LD_ED_RT
EDGE1 ADDQ.B #1,D1
BEQ.S LD_ED_RT
MOVE.B (A3),D0
EOR.B D7,D0
AND.B D6,D0
BEQ EDGE1
EOR.B D6,D7
MOVEQ #1,D0
LD_ED_RT RTS
END