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BED7: clear bottom of screen by printing 32 spaces on line 22
clear_bottom_row BED7 PUSH AF preserve AF, DE, HL, BC
BED8 PUSH DE
BED9 PUSH HL
BEDA PUSH BC
BEDB LD A,$01 Print blank_line_string at coordinates (0,22)
BEDD LD BC,$1600
BEE0 CALL MPRINT
BEE3 POP BC restore BC, HL, DE, AF
BEE4 POP HL
BEE5 POP DE
BEE6 POP AF
BEE7 RET return
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