Messages in this thread |  | | Date | Wed, 06 Dec 2000 13:43:08 +0100 | From | Giacomo Catenazzi <> | Subject | Re: That horrible hack from hell called A20 |
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"H. Peter Anvin" wrote: > > > Good question. The whole thing makes me nervous... in fact, perhaps we > should really consider using the BIOS INT 15h interrupt to enter > protected mode? >
Maybe it is better to try with INT15 AX=2400 (Enable A20 gate).
INT 15-2400 enable A20 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.
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