Routines
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B579: Routine at B579
Used by the routines at abre_a_porta and fecha_a_porta.
Input
Output
LB579 B579 LD C,$50
LB579_0 B57B LD B,$00
LB579_1 B57D DJNZ LB579_1
B57F DEC C
B580 JR NZ,LB579_0
B582 RET
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