Int 16 Fn F401  - Compaq Systempro And Higher - Enable Cache Controller    [b]

   AX = F401h

Return: AX = E201h

Notes: also supported by some versions of AMI BIOS dated June 1992 or later
   many (most) BIOSes return a modified AH when called for an unsupported
     or non-keyboard function (typically, the highest supported keyboard
     function [normally 12h] is subtracted from the original AH)

See Also: AX=F400h,AX=F402h