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B486: Print 4 space characters (B = 4)
Used by the routine at door_print_row.
Sets B = 4, emits $80 (space) via RST $10 B times. Returns.
Helper called from door_print_row.
door_print_4blanks B486 LD B,$04
door_print_4blanks_0 B488 LD A,$80
B48A RST $10
B48B DJNZ door_print_4blanks_0
B48D RET
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