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ED51: Clear Room Buffers
Used by the routine at Unpack_Rooms.
Clear_RoomBuffers ED51 PUSH AF Stash AF on the stack.
ED52 XOR A Write 00 to *ATTR_P.
ED53 LD ($5C8D),A
ED56 LD B,$18 Clear the bottom 18 lines using CL_LINE.
ED58 CALL $0E44
ED5B LD HL,$5DCE Fill Buffer_RoomTiles with C8.
ED5E LD DE,$5DCF
ED61 LD (HL),$C8
ED63 LD BC,$0320
ED66 LDIR
ED68 LD (HL),$00 Fill Buffer_RoomAttributes with 00.
ED6A LD BC,$031F
ED6D LDIR
ED6F POP AF Restore AF from the stack.
ED70 RET Return.
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