Re: That horrible hack from hell called A20

[Alan Cox]

> INT 15-2401 disable A20
> INT 15-2402 query status A20
> INT 15-2403 query A20 support (kdb or port 92)
> 
> IBM classifies these functions as optional, but it is enabled on a lot
> of
> new BIOS, no know conflicts, thus we can call this function to enable
> A20,
> check the result and only after failure we can try the old methods.

I trust Linus over BIOS vendors, every single time. 

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