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B579: Door sprite short delay (C=$50, ~80×256 iterations)
Used by the routines at door_open and door_close.
Outer C = $50 (80), inner B = 0 (256 iterations). Same structure as
delay but shorter. Called between rows in door_open/door_close.
door_short_delay B579 LD C,$50
door_short_delay_0 B57B LD B,$00
door_short_delay_1 B57D DJNZ door_short_delay_1
B57F DEC C
B580 JR NZ,door_short_delay_0
B582 RET
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