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FE8F: Convert a screen address to a buffer address and store it
Used by the routine at EFBD.
Input
DE Screen address
FE8F LD HL,$9260 Add the offset so the address is in the buffer starting at D260
FE92 ADD HL,DE
FE93 EX DE,HL Put this in DE.
FE94 LD HL,($F047) Put the buffer address in F047.
FE97 RET
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