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8A37: Underline
Input
B Number of locations to write FF to
HL Screen buffer address
Underline 8A37 LD (HL),$FF Write FF to *HL.
8A39 INC HL Increment HL by one.
8A3A DJNZ Underline Decrease counter by one and loop back to Underline until counter is zero.
8A3C RET Return.
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