Routines
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D62C: Wipe the area in the buffer and remember it
Used by the routine at wipe_height.
wipe_rect D62C CALL calc_vram_addr DE = its display address, BC = its buffer address
D62F CALL calc_vidbuf_addr
D632 LD A,L rearrange: HL = buffer address, B = width, C = height
D633 LD L,C
D634 LD C,A
D635 LD A,H
D636 LD H,B
D637 LD B,A
D638 LD A,($5BA8) one more rectangle to copy
D63B INC A
D63C LD ($5BA8),A
D63F PUSH BC on the stack until the objects have been drawn
D640 PUSH DE
D641 PUSH HL
D642 XOR A cleared in the buffer: fill_window fills B bytes by C rows with A
D643 CALL fill_window
D646 JP wipe_next_object the next object
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