Int 15/AX=2401h

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SYSTEM - later PS/2s - ENABLE A20 GATE

AX = 2401h

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

See Also: AX=2400h - AX=2402h - PORT 0092h

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

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