Routines
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7187: Fill a memory block with a byte value.
Used by the routine at 718e.
Input
B Loop counter: the MSB of the address to stop at.
C Fill byte.
HL Start address to begin filling.
7187 ld (hl),c Write the fill byte
7188 inc hl
7189 ld a,h
718a cp b
718b jr c,$7187 Repeat until H matches B
718d ret
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