INT 62 u - FGDRIVER v3.03 - "FG_SETFUNC" - SET LOGICAL OPERATION FOR VIDEO OPS
        AX = 0090h
        BX = operation
            0000h replacement
            0001h AND
            0002h OR
            0003h XOR
Notes:  For FGDRIVER v1.10, this function was "FG_QUIET" (see AX=007Fh);
          "FG_SETFUNC" was AX=009Ch
        This function is only available in native EGA/VGA graphics modes
          (0Dh to 12h)
SeeAlso: AX=001Ch,AX=0076h

.