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https://github.com/zellyn/a2audit.git
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39 lines
662 B
NASM
39 lines
662 B
NASM
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;;; Apple II audit routines
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;;; Copyright © 2016 Zellyn Hunter <zellyn@gmail.com>
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!convtab <apple ii/convtab.bin>
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!to "audit.o", plain
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* = $6000
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HOME = $FC58
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COUT = $FDED
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main:
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jsr HOME
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jsr print
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!text "Apple II audit",$8D,0
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jsr print
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!text "Detecting machine version...",$8D,0
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end: jmp *
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;;; print prints a null-terminated string from the address after the
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;;; JSR that called it, returning to the address following the null.
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print:
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tsx
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lda $101,X
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sta getch+1
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lda $102,X
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sta getch+2
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- inc getch+1
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bne getch
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inc getch+2
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getch lda $FEED ; $FEED gets modified
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beq +
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jsr COUT
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jmp -
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+ lda getch+1
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sta $101,X
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lda getch+2
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sta $102,x
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rts
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