INT 14 - X00 FOSSIL - ACTIVATE PORT
        AH = 1Ch
        DX = port number
Return: AX = 1954h if successful
        BL = maximum function number supported (not including 7Eh and above)
        BH = revision of FOSSIL specification supported
Note:   this is a duplicate of AH=04h, so that AH=04h may be made compatible
          with the PS/2 BIOS in a future release
SeeAlso: AH=1Dh