Int 10 Fn 12  - Cirrus Logic BIOS - Set Monitor Horizontal Retrace Freque  [V]

   AH = 12h
   BL = A2h
   AL = retrace rate
       00h standard VGA (31.5 kHz)
       01h 8514-compatible (31.5 kHz and 35.5 kHz interlaced)
       02h SuperVGA (31.5-35.1 kHz)
       03h extended SuperVGA (31.5-35.5 kHz)
       04h multi-frequency (31.5-37.8 kHz)
       05h extended multi-frequency (31.5-48.0 kHz)
       06h super multi-frequency (31.5-56.0 kHz)
       07h extended super multi-frequency (31.5-64.0 kHz)

See Also: AH=12h/BL=9Ah,AH=12h/BL=A0h,AH=12h/BL=A4h