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64441: Display Frame: Calculate Offset
Used by the routine at DisplayFrame.
Returns HL = L * 32 + C.
Input
C Column
L Row
Output
HL Offset
DisplayFrame_CalculateOffset 64441 LD H,0
64443 LD B,H
64444 ADD HL,HL
64445 ADD HL,HL
64446 ADD HL,HL
64447 ADD HL,HL
64448 ADD HL,HL
64449 ADD HL,BC
64450 RET
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