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44 lines
1.0 KiB
ArmAsm
44 lines
1.0 KiB
ArmAsm
;
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; 2019-09-16, Greg King
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;
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; unsigned char __fastcall__ textcolor (unsigned char color);
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; unsigned char __fastcall__ bgcolor (unsigned char color);
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;
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.export _textcolor, _bgcolor
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.importzp tmp1
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.include "cx16.inc"
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_textcolor:
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and #$0F
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sta tmp1
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ldx CHARCOLOR ; get old values
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txa
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and #<~$0F ; keep screen color, remove text color
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ora tmp1
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sta CHARCOLOR ; set new values
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txa
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and #$0F
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rts
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_bgcolor:
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asl a ; move number to screen-color nybble
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asl a
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asl a
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asl a
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sta tmp1
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ldx CHARCOLOR ; get old values
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txa
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and #<~$F0 ; remove screen color, keep text color
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ora tmp1
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sta CHARCOLOR ; set new values
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txa
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lsr a ; get old background color
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lsr a
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lsr a
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lsr a
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rts
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