Int 15 Fn A100  U - Ami Pci Bios - Set ??? Flag                            [x]

   AX = A100h

Return: AX = 0000h
   CF clear
   BX,CX,DI may be destroyed
Desc:  sets bit 7 of CMOS RAM location 37h and updates the CMOS checksum in
     locations 3Eh and 3Fh

Notes: in the examined version of the BIOS, nonzero values in AL cause it to
     drop through to checking the next possible value of AH, i.e. only
     subfunction 00h is supported
   also supported by Dell XPS P90 and IBM PS/PV 6384, which also use
     AMI BIOSes