Int 15 Fn 5380  - Apm Sl Enhanced V1.0 - Set Cpu Speed Mode                [p]

   AX = 5380h
   BH = 0Dh
   CL = CPU clock divider (1,2,4 or 8)
   BL = autocpumode ???

Return: CF clear if successful
Desc:  writes bits 4-5 of CPUPWRMODE register

See Also: AX=5380h/BH=0Ch,AX=5380h/BH=7Eh,AX=5380h/BH=7Fh