Int 15 Fn E800  - Compaq Contura - Get ???                                 [b]

   AX = E800h

Return: AX = 0000h
   BH = 00h
   BL = ??? (read from port 0C7Ch)
   CH = ???
   CL = ???
   DX = 0000h

Note:  also supported by 3/8/93 DESKPRO/i and 7/26/93 LTE Lite 386 ROM BIOS