Int 15 Fn 2305  u - Ibm Bios - Smart Energy System - Get Processor Speed   [B]

   AX = 2305h

Return: CF clear if successful
       AL = processor speed in MHz
   CF set on error
       AL = FFh (speed unknown or >80 MHz)
       AL = error code (80h,86h = unsupported function)

Note:  IBM classifies this function as optional

See Also: AX=2301h,AX=2304h,AH=BCh