2021-11-05 19:15:54 +00:00
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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 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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2021-11-21 19:56:13 +00:00
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000000r 1 ShellCommand = $09
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2021-11-05 19:15:54 +00:00
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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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2021-11-11 02:44:28 +00:00
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000000r 1 Home = $fc58
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2021-11-05 19:15:54 +00:00
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000000r 1 Wait = $fca8
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000000r 1 PromptChar = $33
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2021-11-11 02:44:28 +00:00
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000000r 1 htab = $24
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000000r 1 vtab = $25
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2021-11-05 19:15:54 +00:00
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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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2021-11-21 19:56:13 +00:00
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002000 1 20 00 C3 jsr $c300 ; force 80 columns
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002003 1 2C 10 C0 bit ClearKeyboard
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002006 1 A9 09 lda #ShellCommand
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002008 1 20 74 20 jsr SendByte
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00200B 1 20 0F 20 jsr DumpOutput
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00200E 1 60 rts
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00200F 1
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00200F 1 DumpOutput:
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00200F 1 20 92 20 jsr GetByte
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002012 1 B0 1E bcs checkInput
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002014 1 C9 00 cmp #$00
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002016 1 F0 2D beq endOutput
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002018 1 C9 48 cmp #'H'
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00201A 1 F0 30 beq setColumn
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00201C 1 C9 56 cmp #'V'
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00201E 1 F0 37 beq setRow
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002020 1 C9 43 cmp #'C'
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002022 1 F0 22 beq clearScreen
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002024 1 C9 54 cmp #'T'
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002026 1 F0 3C beq setTop
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002028 1 C9 42 cmp #'B'
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00202A 1 F0 40 beq setBottom
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00202C 1 20 ED FD jsr PrintChar
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00202F 1 4C 0F 20 jmp DumpOutput
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002032 1 checkInput:
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002032 1 2C 00 C0 bit Keyboard ;check for keypress
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002035 1 10 D8 bpl DumpOutput ;keep dumping output if no keypress
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002037 1 AD 00 C0 lda Keyboard ;send keypress to RPi
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00203A 1 29 7F and #$7f
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00203C 1 20 74 20 jsr SendByte
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00203F 1 2C 10 C0 bit ClearKeyboard
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002042 1 4C 0F 20 jmp DumpOutput
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002045 1 endOutput:
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002045 1 60 rts
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002046 1 clearScreen:
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002046 1 20 58 FC jsr Home
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002049 1 4C 0F 20 jmp DumpOutput
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00204C 1 setColumn:
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00204C 1 20 92 20 jsr GetByte
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00204F 1 85 24 sta htab
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002051 1 8D 7B 05 sta $057B
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002054 1 4C 0F 20 jmp DumpOutput
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002057 1 setRow:
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002057 1 20 92 20 jsr GetByte
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00205A 1 85 25 sta vtab
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00205C 1 20 C1 FB jsr $fbc1 ; bascalc
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00205F 1 85 28 sta $28 ;basl
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002061 1 4C 0F 20 jmp DumpOutput
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002064 1 setTop:
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002064 1 20 92 20 jsr GetByte
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002067 1 85 22 sta $22
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002069 1 4C 0F 20 jmp DumpOutput
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00206C 1 setBottom:
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00206C 1 20 92 20 jsr GetByte
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00206F 1 85 23 sta $23
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002071 1 4C 0F 20 jmp DumpOutput
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002074 1
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002074 1 SendByte:
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002074 1 48 pha
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002075 1 waitWrite:
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002075 1 AD FB C0 lda InputFlags
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002078 1 2A rol
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002079 1 2A rol
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00207A 1 B0 F9 bcs waitWrite
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00207C 1 68 pla
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00207D 1 8D FD C0 sta OutputByte
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002080 1 A9 1E lda #$1e ; set bit 0 low to indicate write started
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002082 1 8D F7 C0 sta OutputFlags
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002085 1 finishWrite:
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002085 1 AD FB C0 lda InputFlags
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002088 1 2A rol
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002089 1 2A rol
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00208A 1 90 F9 bcc finishWrite
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00208C 1 A9 1F lda #$1f
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00208E 1 8D F7 C0 sta OutputFlags
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002091 1 60 rts
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002092 1
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002092 1 GetByte:
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002092 1 A9 1D lda #$1d ;set read flag low
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002094 1 8D F7 C0 sta OutputFlags
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002097 1 waitRead:
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002097 1 AD FB C0 lda InputFlags
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00209A 1 2A rol
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00209B 1 90 0C bcc readByte
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00209D 1 2C 00 C0 bit Keyboard ;keypress will abort waiting to read
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0020A0 1 10 F5 bpl waitRead
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0020A2 1 A9 1F lda #$1f ;set all flags high and exit
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0020A4 1 8D F7 C0 sta OutputFlags
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0020A7 1 38 sec ;failure
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0020A8 1 60 rts
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0020A9 1 readByte:
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0020A9 1 AD FE C0 lda InputByte
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0020AC 1 48 pha
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0020AD 1 A9 1F lda #$1f ;set all flags high
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0020AF 1 8D F7 C0 sta OutputFlags
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0020B2 1 finishRead:
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0020B2 1 AD FB C0 lda InputFlags
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0020B5 1 2A rol
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0020B6 1 90 FA bcc finishRead
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0020B8 1 68 pla
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0020B9 1 18 clc ;success
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0020BA 1 end:
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0020BA 1 60 rts
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0020BB 1
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0020BB 1 HelpCommand:
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0020BB 1 61 32 68 65 .byte "a2help",$00
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0020BF 1 6C 70 00
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0020C2 1 PromptCommand:
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0020C2 1 61 32 70 72 .byte "a2prompt",$00
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0020C6 1 6F 6D 70 74
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0020CA 1 00
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0020CB 1 OldPromptChar:
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0020CB 1 5D .byte "]"
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0020CC 1
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