INT 62 u - FGDRIVER v3.03 - "FG_XCONVERT" - CONVERT CHAR COLUMN TO SCREEN COL
        AX = 00B1h
        BX = character space column
Return: AX = screen space column of leftmost pixel in specified character col
Note:   For FGDRIVER v1.10, this function was unused;"FG_XCONVERT" was AX=000Eh
SeeAlso: AX=00B0h,AX=00B3h

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