Int 15 Fn 2402  - System - Later Ps/2s - Get A20 Gate Status               [b]

   AX = 2402h

Return: CF clear if successful
       AH = 00h
       AL = current state (00h disabled, 01h enabled)
   CF set on error
       AH = status
       01h keyboard controller is in secure mode
       86h function not supported

Note:  also supported by Qualitas 386MAX v6.01+

See Also: AX=2400h,AX=2401h