Int 15/AX=2402h

SYSTEM - later PS/2s - GET A20 GATE STATUS

AX = 2402h

Return:
CF clear if successful
AH = 00h
AL = current state (00h disabled, 01h enabled)
CX = ??? (set to 0000h-000Bh or FFFFh by AMI BIOS v1.00.03.AV0M)
FFFFh if keyboard controller does not become ready within C000h
read attempts
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

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

Category: Vendor-specific BIOS Extensions - Int 15h - S

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