mirror of
https://github.com/tjboldt/Apple2-IO-RPi.git
synced 2024-11-25 21:33:15 +00:00
49 lines
1.3 KiB
QBasic
49 lines
1.3 KiB
QBasic
|
1000 PRINT "Slot number? "
|
||
|
|
1010 INPUT S
|
||
|
|
1015 REM Set up InputByte, OutputByte, InputFlags and OutputFlags
|
||
|
|
1020 IB = 49294 + S * 16
|
||
|
|
1030 OB = 49293 + S * 16
|
||
|
|
1040 FI = 49291 + S * 16
|
||
|
|
1050 OF = 49287 + S * 16
|
||
|
|
1060 POKE OF,15: REM set to bank zero with flags high
|
||
|
|
1070 GOSUB 2000
|
||
|
|
1999 END
|
||
|
|
2000 REM Execute Command
|
||
|
|
2010 PRINT "$";
|
||
|
|
2020 INPUT CM$
|
||
|
|
2030 A = 5: GOSUB 8000: REM ExecCommand
|
||
|
|
2040 FOR X = 1 TO LEN (CM$)
|
||
|
|
2050 A = ASC ( MID$ (CM$,X,1))
|
||
|
|
2060 GOSUB 8000
|
||
|
|
2070 NEXT
|
||
|
|
2080 A = 0: GOSUB 8000
|
||
|
|
2100 GOSUB 9000
|
||
|
|
2101 PRINT CHR$ (A);
|
||
|
|
2110 IF A = 0 THEN RETURN
|
||
|
|
2130 GOTO 2100
|
||
|
|
7000 REM Get Flags
|
||
|
|
7010 F = PEEK (FI)
|
||
|
|
7020 RF = 0
|
||
|
|
7025 WF = 0
|
||
|
|
7030 IF F > 128 THEN WF = 1:F = F - 128
|
||
|
|
7040 IF F > 64 THEN RF = 1
|
||
|
|
7050 RETURN
|
||
|
|
8000 REM Send Byte
|
||
|
|
8010 GOSUB 7000: REM Wait for read flag low
|
||
|
|
8020 IF RF = 1 THEN GOTO 8010
|
||
|
|
8030 POKE OB,A
|
||
|
|
8040 POKE OF,14: REM Set write flag low
|
||
|
|
8050 GOSUB 7000: REM Wait for read flag high
|
||
|
|
8060 IF RF = 0 GOTO 8050
|
||
|
|
8070 POKE OF,15: REM Set flags high
|
||
|
|
8080 RETURN
|
||
|
|
9000 REM Get Byte
|
||
|
|
9010 POKE OF,13: REM Set read flag low
|
||
|
|
9020 GOSUB 7000: REM Wait for write flag low
|
||
|
|
9030 IF WF = 1 THEN GOTO 9020
|
||
|
|
9040 A = PEEK (IB)
|
||
|
|
9050 POKE OF,15: REM Set flags high
|
||
|
|
9060 GOSUB 7000: REM Wait for write flag high
|
||
|
|
9070 IF WF = 0 THEN GOTO 9060
|
||
|
|
9080 RETURN
|