Routines
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B477: Print C rows of 4 spaces at PRINT AT D,E
Used by the routine at hero_enter_door_anim.
Emits PRINT AT D,E via RST $10, calls door_print_4blanks (4 spaces), INC D, DEC C,
loops until C = 0. Used by hero_enter_door_anim to blank the door column area.
door_print_row B477 LD A,$16
B479 RST $10
B47A LD A,D
B47B RST $10
B47C LD A,E
B47D RST $10
B47E CALL door_print_4blanks
B481 INC D
B482 DEC C
B483 JR NZ,door_print_row
B485 RET
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