Re: Eprom checksum

Ops Sorry David... Now I realize your board is about 20 years younger them
nine!

JL

On Sun, Mar 31, 2013 at 11:28 PM, Jose Luiz Martins <
joseluizmartins@gmail.com> wrote:

> Uauuuu!!!!!!!!!!!!!!!!!!!!!!!!! I was writing something like this to
> flippers when received your email!
>
> I'm facing exactly SAME problem with many Taito boards.
>
> Some 2716 and 2516 are even testing as blank!
>
> I did some research and the EPROM live time is guaranteed for about 10
> years, but many of my boards has between 25 and 30 years old.
>
> Called one friend today, asked him to test some boards and the result is
> the same problem.
>
> I think we should consider some plan against this suicide EPROM behavior.
>
>
> JL
>
>
> On Sun, Mar 31, 2013 at 10:36 PM, David Shoemaker <davids@oz.net> wrote:
>
>> Working on a Midway grid. Board is reporting bad checksums on some roms.
>> The roms have checksums written on them (factory labels with handwritten
>> info).
>>
>>
>>
>> Put a rom into my EMP20 (which I have never used for this size rom before)
>> and then had it calc the checksum. Doesn't match the notation on the
>> label.
>>
>>
>>
>> Loaded a mame rom set into the software and got a different checksum from
>> both my rom and the file.
>>
>>
>>
>> Doing a file compare against the rom loaded into the buffer and the rom in
>> the socket shows dramatic differences.
>>
>>
>>
>> I tried this with one of the roms that the board is reporting as good and
>> got the same kind of results.
>>
>>
>>
>> So now I don't know what to trust.
>>
>>
>>
>> I wanted to calc the checksums of the mame rom images but can't figure out
>> what tool to use (running windows here).
>>
>>
>>
>> Any help appreciated.
>>
>>
>>
>> David
>>
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>
>
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Received on Sun Mar 31 22:39:38 2013