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43 lines
656 B
ArmAsm
43 lines
656 B
ArmAsm
;
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; Ullrich von Bassewitz, 2009-11-02
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;
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; unsigned char __fastcall__ toascii (unsigned char c);
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; /* Convert a target specific character to ascii */
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;
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.export _toascii
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.macpack generic
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.proc _toascii
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; X must be zero on return
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ldx #0
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; Check for code between 65 and 90
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cmp #$41
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blt @L1
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cmp #$5B
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bge @L1
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; Code between 65 and 90
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ora #$20
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rts
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; Check for code between 193 and 219
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@L1: cmp #$C1
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blt @L9
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cmp #$DC
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bge @L9
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; Code between 193 and 219
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and #$7F
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@L9: rts
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.endproc
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