Int 15 Fn 4605  - Compaq Contura 486 And "alladin" 08/05/93 Roms - ???     [b]

   AX = 4605h

Return: CF clear if successful
   CF set on error (not supported)
       AH = 86h (unsupported function)

Note:  this function is a NOP (other than clearing CF) in the 08/05/93 version
     of the Contura 486/486c/486cx and "Aladdin" ROM, and the 7/26/93
     LTE Lite 386 ROM