mirror of
https://github.com/cc65/cc65.git
synced 2024-11-19 06:31:31 +00:00
54 lines
1.1 KiB
ArmAsm
54 lines
1.1 KiB
ArmAsm
;
|
|
; Karri Kaksonen, 2022-04-16
|
|
;
|
|
;
|
|
|
|
.export _textcolor
|
|
.export txtcolor
|
|
|
|
.include "atari7800.inc"
|
|
|
|
.data
|
|
;-----------------------------------------------------------------------------
|
|
; Holder of the text colour offset
|
|
; 0 = red, 42 = green, 84 = white
|
|
;
|
|
txtcolor:
|
|
.byte 0
|
|
|
|
.code
|
|
|
|
;-----------------------------------------------------------------------------
|
|
; Change the text colour
|
|
;
|
|
; Logical colour names are
|
|
; 0 = red
|
|
; 1 = green
|
|
; 2 = white
|
|
;
|
|
; The routine will also return the previous textcolor
|
|
;
|
|
.proc _textcolor
|
|
|
|
beq @L2
|
|
sec
|
|
sbc #1
|
|
beq @L1
|
|
lda #84
|
|
jmp @L2
|
|
@L1: lda #42
|
|
@L2: ldy txtcolor
|
|
sta txtcolor ; Store new textcolor
|
|
ldx #0
|
|
tya
|
|
bne @L3
|
|
rts ; Old colour was 0
|
|
@L3: sec
|
|
sbc #42
|
|
bne @L4
|
|
lda #1
|
|
rts ; Old colour was 1
|
|
@L4: lda #2
|
|
rts ; Old colour was 2
|
|
.endproc
|