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28 lines
466 B
ArmAsm
28 lines
466 B
ArmAsm
; isascii.s
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;
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; This file is part of
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; cc65 - a freeware C compiler for 6502 based systems
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;
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; https://github.com/cc65/cc65
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;
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; See "LICENSE" file for legal information.
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;
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; int isascii (int c);
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;
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.export _isascii
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_isascii:
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cpx #$00 ; Char range ok?
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bne @L1 ; Jump if no
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tay
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bmi @L1
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inx
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rts
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@L1: lda #$00 ; Return false
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tax
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rts
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