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ECDA: Clears the screen
Used by the routines at wait_for_keypress and redefine_keys.
clear_screen ECDA LD HL,$5900 Wipe bottom 2/3rds of attributes
ECDD LD DE,$5901
ECE0 LD BC,$01FF
ECE3 LD (HL),L
ECE4 LDIR
ECE6 LD HL,$4800 Wipe bottom 2/3rds of pixels
ECE9 LD DE,$4801
ECEC LD (HL),L
ECED LD BC,$0FFF
ECF0 LDIR
ECF2 RET Return
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