Date: Wed, 3 Jan 1996 09:47:17 GMT From: Steve Gailey <steveg@hplona90.uksr.hp.com> Message-ID: <9601030947.AA22193@hplona90.uksr.hp.com>
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> I have a few older (read: ancient!) Compaq systems I'd like to >put FBSD on. Unfortunately, Compaq (in their infinite wisdom -- NOT!) >have fixed disk parameter tables in their BIOS. So, regardless of >the size of the (IDE) disk I might install, I am limited to >whatever geometry Compaq has chosen to support. > I'd like to cut a new set of EPROMs with an altered disk table >but the POST screams about bad checksums. Anyone have a clue as >to the algorithm employed and the location of the checksum image >(before I start disassembling code)? Just after the bios id AA55<size> is a checksum which is a checksum of all the following bios. If you alter the bios, you must calculate a new checksum. This is how the system ensures that the bios is not dammaged. Steve Gailey steveg@metrosol.demon.co.uk
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