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AX = 2400h
Return:
CF clear if successful AH = 00h CF set on error AH = status 01h keyboard controller is in secure mode 86h function not supported
Notes: Also supported by AMI PCI BIOS and Qualitas 386MAX v6.01+. IBM classifies this function as optional
BUG: AMI BIOS v1.00.03.AV0M never reports an error on failure to disable the A20 gate; it simply writes 0 to PORT 0092h
See Also: AX=2401h - AX=2402h - AX=2403h - PORT 0092h
Category: Vendor-specific BIOS Extensions - Int 15h - S
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