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cc65/libsrc/atari/bgcolor.s

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;
; Christian Groessler, 02-Apr-2019
;
.export _bgcolor
.include "atari.inc"
_bgcolor:
ldx COLOR2 ; get old value
sta COLOR2 ; set new value
and #$0e
cmp #8
bcs bright
lda #$0e
.byte $2c ; bit opcode, eats the next 2 bytes
bright: lda #0
sta COLOR1
txa
ldx #0 ; fix X
rts