mirror of https://github.com/cc65/cc65.git
54 lines
1.1 KiB
ArmAsm
54 lines
1.1 KiB
ArmAsm
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; Karri Kaksonen, 2022-04-16
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.export _textcolor
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.export txtcolor
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.include "atari7800.inc"
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.data
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;-----------------------------------------------------------------------------
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; Holder of the text colour offset
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; 0 = red, 42 = green, 84 = white
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;
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txtcolor:
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.byte 0
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.code
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;-----------------------------------------------------------------------------
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; Change the text colour
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;
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; Logical colour names are
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; 0 = red
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; 1 = green
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; 2 = white
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;
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; The routine will also return the previous textcolor
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;
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.proc _textcolor
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beq @L2
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sec
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sbc #1
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beq @L1
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lda #84
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jmp @L2
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@L1: lda #42
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@L2: ldy txtcolor
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sta txtcolor ; Store new textcolor
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ldx #0
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tya
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bne @L3
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rts ; Old colour was 0
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@L3: sec
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sbc #42
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bne @L4
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lda #1
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rts ; Old colour was 1
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@L4: lda #2
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rts ; Old colour was 2
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.endproc
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