mirror of
https://github.com/tjboldt/Apple2-IO-RPi.git
synced 2024-11-20 04:31:04 +00:00
223 lines
3.2 KiB
NASM
Executable File
223 lines
3.2 KiB
NASM
Executable File
;ProDOS Zero Page
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Command = $42 ;ProDOS Command
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Unit = $43 ;ProDOS unit (SDDD0000)
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BufferLo = $44
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BufferHi = $45
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BlockLo = $46
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BlockHi = $47
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; ProDOS Error Codes
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IOError = $27
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NoDevice = $28
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WriteProtect = $2B
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; hard code slot to 7 for now, will make it auto-detect later
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SLOT = 7
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InputByte = $c08e+SLOT*$10
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OutputByte = $c08d+SLOT*$10
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InputFlags = $c08b+SLOT*$10
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OutputFlags = $c087+SLOT*$10
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ReadBlockCommand = $01
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WriteBlockCommand = $02
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GetTimeCommand = $03
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ChangeDriveCommand = $04
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ExecCommand = $05
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LoadFileCommand = $06
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SaveFileCommand = $07
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MenuCommand = $08
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InputString = $fd6a
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StringBuffer = $0200
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PrintChar = $fded
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Keyboard = $c000
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ClearKeyboard = $c010
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Home = $fc58
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Wait = $fca8
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PromptChar = $33
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htab = $24
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vtab = $25
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ESC = $9b
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.org $2000
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Start:
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lda PromptChar
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sta OldPromptChar
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lda #'$'|$80
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sta PromptChar
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lda #ExecCommand
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jsr SendByte
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ldx #$00
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sendHelpCommand:
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lda HelpCommand,x
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cmp #$00
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beq sendHelpCommandEnd
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jsr SendByte
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inx
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bpl sendHelpCommand
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sendHelpCommandEnd:
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lda #$00
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jsr SendByte
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bit ClearKeyboard
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jsr DumpOutput
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Prompt:
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lda #ExecCommand
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jsr SendByte
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ldx #$00
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sendPromptCommand:
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lda PromptCommand,x
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cmp #$00
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beq sendPromptCommandEnd
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jsr SendByte
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inx
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bpl sendPromptCommand
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sendPromptCommandEnd:
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lda #$00
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jsr SendByte
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bit ClearKeyboard
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jsr DumpOutput
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; get input
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jsr InputString
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; check for "exit"
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lda StringBuffer
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cmp #'e'|$80
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bne Execute
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lda StringBuffer+1
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cmp #'x'|$80
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bne Execute
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lda StringBuffer+2
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cmp #'i'|$80
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bne Execute
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lda StringBuffer+3
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cmp #'t'|$80
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bne Execute
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lda OldPromptChar
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sta PromptChar
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rts
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Execute:
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bit ClearKeyboard
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lda #ExecCommand
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jsr SendByte
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ldy #$00
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sendInput:
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lda $0200,y
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cmp #$8d
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beq sendNullTerminator
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and #$7f
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jsr SendByte
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iny
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bne sendInput
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sendNullTerminator:
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lda #$00
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jsr SendByte
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jsr DumpOutput
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jmp Prompt
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DumpOutput:
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jsr GetByte
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bcs checkInput
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cmp #$00
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beq endOutput
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cmp #'H'
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beq setColumn
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cmp #'V'
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beq setRow
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cmp #'C'
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beq clearScreen
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cmp #'T'
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beq setTop
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cmp #'B'
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beq setBottom
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jsr PrintChar
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jmp DumpOutput
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checkInput:
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bit Keyboard ;check for keypress
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bpl DumpOutput ;keep dumping output if no keypress
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lda Keyboard ;send keypress to RPi
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and #$7f
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jsr SendByte
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bit ClearKeyboard
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jmp DumpOutput
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endOutput:
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rts
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clearScreen:
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jsr Home
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jmp DumpOutput
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setColumn:
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jsr GetByte
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sta htab
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sta $057B
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jmp DumpOutput
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setRow:
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jsr GetByte
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sta vtab
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jsr $fbc1 ; bascalc
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sta $28 ;basl
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jmp DumpOutput
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setTop:
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jsr GetByte
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sta $22
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jmp DumpOutput
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setBottom:
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jsr GetByte
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sta $23
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jmp DumpOutput
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SendByte:
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pha
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waitWrite:
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lda InputFlags
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rol
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rol
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bcs waitWrite
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pla
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sta OutputByte
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lda #$1e ; set bit 0 low to indicate write started
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sta OutputFlags
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finishWrite:
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lda InputFlags
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rol
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rol
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bcc finishWrite
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lda #$1f
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sta OutputFlags
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rts
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GetByte:
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lda #$1d ;set read flag low
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sta OutputFlags
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waitRead:
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lda InputFlags
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rol
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bcc readByte
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bit Keyboard ;keypress will abort waiting to read
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bpl waitRead
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lda #$1f ;set all flags high and exit
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sta OutputFlags
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sec ;failure
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rts
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readByte:
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lda InputByte
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pha
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lda #$1f ;set all flags high
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sta OutputFlags
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finishRead:
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lda InputFlags
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rol
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bcc finishRead
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pla
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clc ;success
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end:
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rts
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HelpCommand:
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.byte "a2help",$00
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PromptCommand:
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.byte "a2prompt",$00
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OldPromptChar:
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.byte "]"
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