INT 10 - VIDEO - Compaq LTE Lite - ENABLE ???
        AX = BF09h
Return: CF clear
Note:   sets bit 6 of port 03CEh index 81h; in some cases also sets index 84h
          to 6Fh and index 83h to 04h
SeeAlso: AX=BF0Ah,AX=BF0Bh

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