mirror of
https://github.com/tjboldt/Apple2-IO-RPi.git
synced 2024-05-29 00:41:45 +00:00
214 lines
8.0 KiB
Plaintext
214 lines
8.0 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 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
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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 Wait = $fca8
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000000r 1 PromptChar = $33
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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 $2000
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002000 1 Start:
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002000 1 A5 33 lda PromptChar
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002002 1 8D 20 21 sta OldPromptChar
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002005 1 A9 A4 lda #'$'|$80
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002007 1 85 33 sta PromptChar
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002009 1 A9 05 lda #ExecCommand
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00200B 1 20 C9 20 jsr SendByte
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00200E 1 A2 00 ldx #$00
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002010 1 sendHelpCommand:
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002010 1 BD 10 21 lda HelpCommand,x
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002013 1 C9 00 cmp #$00
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002015 1 F0 06 beq sendHelpCommandEnd
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002017 1 20 C9 20 jsr SendByte
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00201A 1 E8 inx
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00201B 1 10 F3 bpl sendHelpCommand
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00201D 1 sendHelpCommandEnd:
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00201D 1 A9 00 lda #$00
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00201F 1 20 C9 20 jsr SendByte
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002022 1 2C 10 C0 bit ClearKeyboard
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002025 1 20 90 20 jsr DumpOutput
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002028 1
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002028 1 Prompt:
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002028 1 A9 05 lda #ExecCommand
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00202A 1 20 C9 20 jsr SendByte
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00202D 1 A2 00 ldx #$00
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00202F 1 sendPromptCommand:
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00202F 1 BD 17 21 lda PromptCommand,x
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002032 1 C9 00 cmp #$00
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002034 1 F0 06 beq sendPromptCommandEnd
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002036 1 20 C9 20 jsr SendByte
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002039 1 E8 inx
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00203A 1 10 F3 bpl sendPromptCommand
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00203C 1 sendPromptCommandEnd:
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00203C 1 A9 00 lda #$00
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00203E 1 20 C9 20 jsr SendByte
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002041 1 2C 10 C0 bit ClearKeyboard
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002044 1 20 90 20 jsr DumpOutput
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002047 1
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002047 1 ; get input
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002047 1 20 6A FD jsr InputString
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00204A 1 ; check for "exit"
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00204A 1 AD 00 02 lda StringBuffer
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00204D 1 C9 E5 cmp #'e'|$80
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00204F 1 D0 1B bne Execute
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002051 1 AD 01 02 lda StringBuffer+1
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002054 1 C9 F8 cmp #'x'|$80
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002056 1 D0 14 bne Execute
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002058 1 AD 02 02 lda StringBuffer+2
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00205B 1 C9 E9 cmp #'i'|$80
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00205D 1 D0 0D bne Execute
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00205F 1 AD 03 02 lda StringBuffer+3
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002062 1 C9 F4 cmp #'t'|$80
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002064 1 D0 06 bne Execute
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002066 1 AD 20 21 lda OldPromptChar
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002069 1 85 33 sta PromptChar
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00206B 1 60 rts
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00206C 1 Execute:
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00206C 1 2C 10 C0 bit ClearKeyboard
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00206F 1 A9 05 lda #ExecCommand
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002071 1 20 C9 20 jsr SendByte
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002074 1 A0 00 ldy #$00
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002076 1 sendInput:
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002076 1 B9 00 02 lda $0200,y
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002079 1 C9 8D cmp #$8d
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00207B 1 F0 08 beq sendNullTerminator
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00207D 1 29 7F and #$7f
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00207F 1 20 C9 20 jsr SendByte
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002082 1 C8 iny
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002083 1 D0 F1 bne sendInput
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002085 1 sendNullTerminator:
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002085 1 A9 00 lda #$00
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002087 1 20 C9 20 jsr SendByte
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00208A 1 20 90 20 jsr DumpOutput
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00208D 1 4C 28 20 jmp Prompt
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002090 1
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002090 1 DumpOutput:
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002090 1 20 E7 20 jsr GetByte
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002093 1 B0 0B bcs skipOutput
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002095 1 C9 00 cmp #$00
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002097 1 F0 1A beq endOutput
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002099 1 C9 9B cmp #ESC
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00209B 1 F0 17 beq escapeSequence
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00209D 1 20 ED FD jsr PrintChar
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0020A0 1 skipOutput:
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0020A0 1 2C 00 C0 bit Keyboard ;check for keypress
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0020A3 1 10 EB bpl DumpOutput ;keep dumping output if no keypress
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0020A5 1 AD 00 C0 lda Keyboard ;send keypress to RPi
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0020A8 1 ;jsr PrintChar
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0020A8 1 29 7F and #$7f
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0020AA 1 20 C9 20 jsr SendByte
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0020AD 1 2C 10 C0 bit ClearKeyboard
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0020B0 1 18 clc
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0020B1 1 90 DD bcc DumpOutput
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0020B3 1 endOutput:
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0020B3 1 60 rts
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0020B4 1 escapeSequence:
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0020B4 1 20 BA 20 jsr ParseEscape
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0020B7 1 18 clc
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0020B8 1 90 D6 bcc DumpOutput
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0020BA 1
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0020BA 1 ParseEscape:
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0020BA 1 20 E7 20 jsr GetByte ; expect first byte after ESC to be '['
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0020BD 1 C9 DB cmp #'['|$80
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0020BF 1 F0 07 beq endParse
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0020C1 1 checkLetter:
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0020C1 1 20 E7 20 jsr GetByte ; loop until there is a letter
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0020C4 1 C9 C1 cmp #$C1
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0020C6 1 90 F9 bcc checkLetter
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0020C8 1 endParse:
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0020C8 1 60 rts
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0020C9 1
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0020C9 1 SendByte:
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0020C9 1 48 pha
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0020CA 1 waitWrite:
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0020CA 1 AD FB C0 lda InputFlags
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0020CD 1 2A rol
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0020CE 1 2A rol
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0020CF 1 B0 F9 bcs waitWrite
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0020D1 1 68 pla
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0020D2 1 8D FD C0 sta OutputByte
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0020D5 1 A9 1E lda #$1e ; set bit 0 low to indicate write started
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0020D7 1 8D F7 C0 sta OutputFlags
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0020DA 1 finishWrite:
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0020DA 1 AD FB C0 lda InputFlags
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0020DD 1 2A rol
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0020DE 1 2A rol
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0020DF 1 90 F9 bcc finishWrite
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0020E1 1 A9 1F lda #$1f
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0020E3 1 8D F7 C0 sta OutputFlags
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0020E6 1 60 rts
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0020E7 1
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0020E7 1 GetByte:
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0020E7 1 A9 1D lda #$1d ;set read flag low
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0020E9 1 8D F7 C0 sta OutputFlags
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0020EC 1 waitRead:
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0020EC 1 AD FB C0 lda InputFlags
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0020EF 1 2A rol
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0020F0 1 90 0C bcc readByte
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0020F2 1 2C 00 C0 bit Keyboard ;keypress will abort waiting to read
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0020F5 1 10 F5 bpl waitRead
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0020F7 1 A9 1F lda #$1f ;set all flags high and exit
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0020F9 1 8D F7 C0 sta OutputFlags
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0020FC 1 38 sec ;failure
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0020FD 1 60 rts
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0020FE 1 readByte:
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0020FE 1 AD FE C0 lda InputByte
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002101 1 48 pha
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002102 1 A9 1F lda #$1f ;set all flags high
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002104 1 8D F7 C0 sta OutputFlags
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002107 1 finishRead:
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002107 1 AD FB C0 lda InputFlags
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00210A 1 2A rol
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00210B 1 90 FA bcc finishRead
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00210D 1 68 pla
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00210E 1 18 clc ;success
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00210F 1 end:
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00210F 1 60 rts
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002110 1
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002110 1 HelpCommand:
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002110 1 61 32 68 65 .byte "a2help",$00
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002114 1 6C 70 00
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002117 1 PromptCommand:
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002117 1 61 32 70 72 .byte "a2prompt",$00
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00211B 1 6F 6D 70 74
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00211F 1 00
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002120 1 OldPromptChar:
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002120 1 5D .byte "]"
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002121 1
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