Routines
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88E2: Clears the game screen attributes and the game screen to zero
Calls clear_playfield_attrs for the attributes, then clears the 4096 bitmap bytes at $4800 — again the lower 16 character rows — with a second rolling LDIR fill.
Used by the routine at set_playfield_attrs.
clear_playfield 88E2 CALL clear_playfield_attrs
88E5 LD HL,$4800
88E8 LD DE,$4801
88EB LD BC,$0FFF
88EE LD (HL),L
88EF LDIR
88F1 RET
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