INT 10 - VIDEO - Compaq LTE Lite - DISABLE ???
        AX = BF0Ah
Return: CF clear
Note:   clears bit 6 of port 03CEh index 81h; in some cases also sets index 84h
          to 80h and index 83h to FBh
SeeAlso: AX=BF09h,AX=BF0Bh

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