Int 16 Fn F1  - Compaq 386 And Newer - Read Current Cpu Speed              [b]

   AH = F1h

Return: AL = speed code (see #0538)
   if AL = 09h, CX = speed code

Note:  also supported by some versions of AMI BIOS dated June 1992 or later

See Also: AH=F0h,AH=F3h