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https://github.com/zellyn/a2audit.git
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40 lines
540 B
NASM
40 lines
540 B
NASM
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;;; Apple II keyboard and keyboard audit routines
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;;; Copyright © 2017 Zellyn Hunter <zellyn@gmail.com>
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!zone keyboard {
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KEYBOARDTESTS
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+print
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!text "PRESS 'Y', 'N', SPACE, OR ESC",$8D
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+printed
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jsr YNESCSPACE
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rts
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YNESCSPACE
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lda KBDSTRB
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-- lda KBD
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bpl --
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sta KBDSTRB
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cmp #$a0 ; SPACE: bmi/bcc
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bne +
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clc
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lda #$a0
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rts
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+ cmp #$9B ; ESC: bmi/bcs
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bne +
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sec
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lda #$9B
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rts
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+ and #$5f ; mask out lowercase
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cmp #$59 ; 'Y': bpl/bcc
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bne +
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clc
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lda #$59
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rts
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+ cmp #$4e ; 'N': bpl/bcs
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bne --
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sec
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lda #$4e
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rts
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} ;keyboard
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