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FBB9: Display Frame: Calculate Offset
Used by the routine at DisplayFrame.
Returns HL = L * 20 + C.
Input
C Column
L Row
Output
HL Offset
DisplayFrame_CalculateOffset FBB9 LD H,$00
FBBB LD B,H
FBBC ADD HL,HL
FBBD ADD HL,HL
FBBE ADD HL,HL
FBBF ADD HL,HL
FBC0 ADD HL,HL
FBC1 ADD HL,BC
FBC2 RET
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