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https://github.com/tjboldt/Apple2-IO-RPi.git
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64 lines
708 B
NASM
64 lines
708 B
NASM
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;Translation of code written in mini-assembler on Apple //e
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;Currently only works if card is in slot 5
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.org $1000
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lda $33
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pha
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lda #$a4
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sta $33
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GetCommand:
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jsr $fd6a
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lda $0200
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cmp #$8d ;stop when return found
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beq ExitApp
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jsr DumpOutput
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clc
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bcc GetCommand
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ExitApp:
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pla
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sta $33
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lda #$00
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sty $34
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rts
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brk
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brk
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brk
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brk
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brk
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brk
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brk
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brk
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brk
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brk
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brk
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brk
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DumpOutput:
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ldx #$50
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lda #$05 ;send command 5 = exec
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jsr $c5aa
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ldy #$00
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getInput:
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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 $c5aa
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iny
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bne getInput
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sendNullTerminator:
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lda #$00
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jsr $c5aa ;send byte
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getOutput:
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jsr $c5c8 ;get byte
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cmp #$00
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beq endOutput
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jsr $fded
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clc
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bcc getOutput
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endOutput:
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rts
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