mirror of
https://github.com/tjboldt/Apple2-IO-RPi.git
synced 2024-05-28 09:41:30 +00:00
233 lines
8.6 KiB
Plaintext
233 lines
8.6 KiB
Plaintext
ca65 V2.17 - Raspbian 2.17-1
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Main file : Shell.asm
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Current file: Shell.asm
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000000r 1 ;ProDOS Zero Page
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000000r 1 Command = $42 ;ProDOS Command
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000000r 1 Unit = $43 ;ProDOS unit (SDDD0000)
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000000r 1 BufferLo = $44
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000000r 1 BufferHi = $45
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000000r 1 BlockLo = $46
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000000r 1 BlockHi = $47
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000000r 1
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000000r 1 ; ProDOS Error Codes
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000000r 1 IOError = $27
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000000r 1 NoDevice = $28
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000000r 1 WriteProtect = $2B
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000000r 1
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000000r 1 ; hard code slot to 7 for now, will make it auto-detect later
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000000r 1 SLOT = 7
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000000r 1
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000000r 1 InputByte = $c08e+SLOT*$10
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000000r 1 OutputByte = $c08d+SLOT*$10
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000000r 1 InputFlags = $c08b+SLOT*$10
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000000r 1 OutputFlags = $c087+SLOT*$10
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000000r 1
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000000r 1 ResetCommand = $00
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000000r 1 ReadBlockCommand = $01
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000000r 1 WriteBlockCommand = $02
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000000r 1 GetTimeCommand = $03
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000000r 1 ChangeDriveCommand = $04
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000000r 1 ExecCommand = $05
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000000r 1 LoadFileCommand = $06
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000000r 1 SaveFileCommand = $07
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000000r 1 MenuCommand = $08
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000000r 1 ShellCommand = $09
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000000r 1
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000000r 1 InputString = $fd6a
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000000r 1 StringBuffer = $0200
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000000r 1 PrintChar = $fded
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000000r 1 Keyboard = $c000
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000000r 1 ClearKeyboard = $c010
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000000r 1 Home = $fc58
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000000r 1 Wait = $fca8
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000000r 1 PromptChar = $33
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000000r 1 Read80Col = $c01f
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000000r 1 TextPage1 = $c054
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000000r 1 TextPage2 = $c055
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000000r 1
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000000r 1 htab = $24
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000000r 1 vtab = $25
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000000r 1 BasL = $28
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000000r 1 htab80 = $057b
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000000r 1 BasCalc = $fbc1
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000000r 1
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000000r 1 LastChar = $06
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000000r 1
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000000r 1 ESC = $9b
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000000r 1
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000000r 1 .org $2000
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002000 1 Start:
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002000 1 20 00 C3 jsr $c300 ; force 80 columns
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002003 1 A5 06 lda LastChar
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002005 1 48 pha
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002006 1 2C 10 C0 bit ClearKeyboard
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002009 1 A9 00 lda #ResetCommand
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00200B 1 20 9F 20 jsr SendByte
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00200E 1 A9 09 lda #ShellCommand
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002010 1 20 9F 20 jsr SendByte
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002013 1 20 1A 20 jsr DumpOutput
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002016 1 68 pla
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002017 1 85 06 sta LastChar
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002019 1 60 rts
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00201A 1
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00201A 1 DumpOutput:
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00201A 1 20 BD 20 jsr GetByte
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00201D 1 B0 2A bcs checkInput
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00201F 1 C9 00 cmp #$00
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002021 1 F0 39 beq endOutput
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002023 1 48 pha
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002024 1 20 1C 21 jsr ClearCursor
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002027 1 68 pla
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002028 1 C9 48 cmp #'H'
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00202A 1 F0 3A beq setColumn
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00202C 1 C9 56 cmp #'V'
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00202E 1 F0 44 beq setRow
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002030 1 C9 43 cmp #'C'
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002032 1 F0 29 beq clearScreen
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002034 1 C9 54 cmp #'T'
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002036 1 F0 4A beq setTop
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002038 1 C9 42 cmp #'B'
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00203A 1 F0 4E beq setBottom
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00203C 1 C9 55 cmp #'U'
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00203E 1 F0 52 beq moveUp
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002040 1 20 ED FD jsr PrintChar
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002043 1 20 EB 20 jsr SetCursor
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002046 1 4C 1A 20 jmp DumpOutput
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002049 1 checkInput:
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002049 1 2C 00 C0 bit Keyboard ;check for keypress
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00204C 1 10 CC bpl DumpOutput ;keep dumping output if no keypress
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00204E 1 AD 00 C0 lda Keyboard ;send keypress to RPi
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002051 1 29 7F and #$7f
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002053 1 20 9F 20 jsr SendByte
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002056 1 2C 10 C0 bit ClearKeyboard
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002059 1 4C 1A 20 jmp DumpOutput
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00205C 1 endOutput:
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00205C 1 60 rts
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00205D 1 clearScreen:
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00205D 1 20 58 FC jsr Home
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002060 1 20 EB 20 jsr SetCursor
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002063 1 4C 1A 20 jmp DumpOutput
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002066 1 setColumn:
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002066 1 20 BD 20 jsr GetByte
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002069 1 85 24 sta htab
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00206B 1 8D 7B 05 sta htab80
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00206E 1 20 EB 20 jsr SetCursor
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002071 1 4C 1A 20 jmp DumpOutput
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002074 1 setRow:
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002074 1 20 BD 20 jsr GetByte
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002077 1 85 25 sta vtab
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002079 1 20 C1 FB jsr BasCalc
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00207C 1 20 EB 20 jsr SetCursor
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00207F 1 4C 1A 20 jmp DumpOutput
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002082 1 setTop:
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002082 1 20 BD 20 jsr GetByte
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002085 1 85 22 sta $22
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002087 1 4C 1A 20 jmp DumpOutput
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00208A 1 setBottom:
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00208A 1 20 BD 20 jsr GetByte
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00208D 1 85 23 sta $23
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00208F 1 4C 1A 20 jmp DumpOutput
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002092 1 moveUp:
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002092 1 C6 25 dec vtab
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002094 1 A5 25 lda vtab
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002096 1 20 C1 FB jsr BasCalc
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002099 1 20 EB 20 jsr SetCursor
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00209C 1 4C 1A 20 jmp DumpOutput
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00209F 1
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00209F 1 SendByte:
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00209F 1 48 pha
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0020A0 1 waitWrite:
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0020A0 1 AD FB C0 lda InputFlags
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0020A3 1 2A rol
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0020A4 1 2A rol
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0020A5 1 B0 F9 bcs waitWrite
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0020A7 1 68 pla
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0020A8 1 8D FD C0 sta OutputByte
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0020AB 1 A9 1E lda #$1e ; set bit 0 low to indicate write started
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0020AD 1 8D F7 C0 sta OutputFlags
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0020B0 1 finishWrite:
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0020B0 1 AD FB C0 lda InputFlags
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0020B3 1 2A rol
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0020B4 1 2A rol
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0020B5 1 90 F9 bcc finishWrite
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0020B7 1 A9 1F lda #$1f
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0020B9 1 8D F7 C0 sta OutputFlags
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0020BC 1 60 rts
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0020BD 1
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0020BD 1 GetByte:
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0020BD 1 2C 00 C0 bit Keyboard ; skip byte read if key pressed
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0020C0 1 90 10 bcc keyPressed
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0020C2 1 A9 1D lda #$1d ;set read flag low
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0020C4 1 8D F7 C0 sta OutputFlags
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0020C7 1 waitRead:
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0020C7 1 AD FB C0 lda InputFlags
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0020CA 1 2A rol
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0020CB 1 90 0C bcc readByte
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0020CD 1 2C 00 C0 bit Keyboard ;keypress will abort waiting to read
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0020D0 1 10 F5 bpl waitRead
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0020D2 1 keyPressed:
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0020D2 1 A9 1F lda #$1f ;set all flags high and exit
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0020D4 1 8D F7 C0 sta OutputFlags
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0020D7 1 38 sec ;failure
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0020D8 1 60 rts
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0020D9 1 readByte:
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0020D9 1 AD FE C0 lda InputByte
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0020DC 1 48 pha
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0020DD 1 A9 1F lda #$1f ;set all flags high
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0020DF 1 8D F7 C0 sta OutputFlags
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0020E2 1 finishRead:
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0020E2 1 AD FB C0 lda InputFlags
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0020E5 1 2A rol
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0020E6 1 90 FA bcc finishRead
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0020E8 1 68 pla
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0020E9 1 18 clc ;success
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0020EA 1 end:
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0020EA 1 60 rts
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0020EB 1
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0020EB 1 SetCursor:
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0020EB 1 AD 7B 05 lda htab80 ;get horizontal location / 2
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0020EE 1 4A lsr
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0020EF 1 A8 tay
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0020F0 1 AD 55 C0 lda TextPage2
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0020F3 1 90 03 bcc setChar
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0020F5 1 AD 54 C0 lda TextPage1
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0020F8 1 setChar:
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0020F8 1 B1 28 lda (BasL),y
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0020FA 1 85 06 sta LastChar ; save so ClearCursor will pick it up
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0020FC 1 C9 E0 cmp #$e0
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0020FE 1 10 0C bpl lowerCase
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002100 1 C9 C0 cmp #$c0
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002102 1 10 0D bpl upperCase
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002104 1 C9 A0 cmp #$a0
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002106 1 10 04 bpl symbol
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002108 1 C9 80 cmp #$80
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00210A 1 10 0A bpl noop
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00210C 1 symbol:
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00210C 1 lowerCase:
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00210C 1 invert:
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00210C 1 49 80 eor #$80
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00210E 1 4C 16 21 jmp storeChar
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002111 1 upperCase:
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002111 1 29 1F and #$1f
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002113 1 4C 16 21 jmp storeChar
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002116 1 noop:
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002116 1 storeChar:
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002116 1 91 28 sta (BasL),y
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002118 1 AD 54 C0 lda TextPage1
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00211B 1 60 rts
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00211C 1
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00211C 1 ClearCursor:
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00211C 1 AD 7B 05 lda htab80 ;get horizontal location / 2
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00211F 1 4A lsr
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002120 1 A8 tay
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002121 1 AD 55 C0 lda TextPage2
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002124 1 90 03 bcc restoreChar
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002126 1 AD 54 C0 lda TextPage1
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002129 1 restoreChar:
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002129 1 A5 06 lda LastChar
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00212B 1 91 28 sta (BasL),y
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00212D 1 AD 54 C0 lda TextPage1
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002130 1 60 rts
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002130 1
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