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B46C: Door animation delay (C=0×B=0, ~65536 iterations)
Used by the routine at hero_enter_door_anim.
Double-loop spin used as a short pause between door animation frames.
Called from hero_enter_door_anim (hero entering door) between sprite draws.
door_delay B46C LD C,$00
door_delay_0 B46E LD B,$00
door_delay_1 B470 NOP
B471 DJNZ door_delay_1
B473 DEC C
B474 JR NZ,door_delay_0
B476 RET
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