Int 10 Fn BF0F  - Video - Compaq Systempro Xl, Lte Lite - ???              [b]

   AX = BF0Fh
   BX = ??? or FFFFh to get current value

Return: CF clear
   AX = ???

Note:  this function calls AX=BF10h if BX=FFFFh and an EISA System ROM is
     present

See Also: AX=BF10h