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20640: Clear addresses 54784 to 54811
Used by the routine at 21425. Clearing these addresses serves no useful purpose; they are not used until the game has started, and are properly initialised before then anyway.
C 0
20640 LD HL,54784 Fill addresses 54784-54811 (character buffer 214) with 0
20643 LD B,32
20645 LD (HL),C
20646 INC L
20647 DJNZ 20645
20649 RET