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Thread: Amstrad ALT-386SX BIOS dump

  1. #1

    Question Amstrad ALT-386SX BIOS dump

    Hello,

    I'm repairing an Amstrad ALT-386SX. It doesn't execute POST.
    Boards looks good, no corrosion or damaged tracks. Reset and clock signals are ok (probed with a scope).

    I suspect one of the two EPROM (or both) is faulty .
    Does anyone have a dump (or can make these dumps) of these EPROM? So I can compare with mine.



    Many thanks.

  2. #2

    Default

    From searching that model I guess it might be a Phoenix BIOS which I presume has a checksum feature. Personally without a known good BIOS to compare against I would calculate the checksum, then compare against the checksum value stored in the dump. I've also had some success in verifying BIOS dumps by running them in PCem. If it you can't make it run in PCem it doesn't mean it's bad however if it DOES run then it will at least give you the confirmation it's probably good.

  3. #3
    Join Date
    Sep 2012
    Location
    Bradford, West Yorkshire, England
    Posts
    13

    Default

    I've dumped the ROMs on mine (which also doesn't boot but I suspect the Hard disk - does anybody know if a modern - ie >1GB - drive will work?.)
    I'm not sure about the legality of posting them here though, but if you do something like MD5 on your ROMs, I can do the same on mine and then you can compare the results to see if they match.

    Steve

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