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FBC3: Display Frame: Calculate Offset
Used by the routine at DisplayFrame_Copy.
Returns HL = L * 20 + C.
Input
C Column
L Row
Output
HL Offset
DisplayFrame_CalculateOffset FBC3 LD H,$00
FBC5 LD B,H
FBC6 ADD HL,HL
FBC7 ADD HL,HL
FBC8 ADD HL,HL
FBC9 ADD HL,HL
FBCA ADD HL,HL
FBCB ADD HL,BC
FBCC RET
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