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23 lines
414 B
ArmAsm
23 lines
414 B
ArmAsm
.export get_key
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.export check_for_abort_key
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.code
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;use Apple 2 monitor ROM function to read from keyboard
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;inputs: none
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;outputs: A contains ASCII code of key pressed
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get_key:
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jmp $fd1b
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;check whether the escape key is being pressed
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;inputs: none
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;outputs: sec if escape pressed, clear otherwise
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check_for_abort_key:
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lda $c000 ;current key pressed
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cmp #$9B
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bne :+
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sec
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rts
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:
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clc
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rts
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