INT 62 u - FGDRIVER v3.03 - "FG_POINTX" - DISPLAY A PIXEL IN XOR MODE
        AX = 0077h
        BX = column
        CX = row
Notes:  For FGDRIVER v1.10, this function was "FG_GETYJOY" (see AX=0046h);
           "FG_POINTX" did not exist yet
        This call is ignored in text modes
SeeAlso: AX=0041h,AX=0076h

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