Re: Eprom checksum

:) yea my board is only 13 years old at this point.

-----Original Message-----
From: techtoolslist-bounces@flippers.com
[mailto:techtoolslist-bounces@flippers.com] On Behalf Of Jose Luiz Martins
Sent: Sunday, March 31, 2013 7:39 PM
To: Technical Tools Mail List
Subject: Re: [Techtoolslist] 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
>>
>> _______________________________________________
>> Techtoolslist mailing list
>> Techtoolslist@flippers.com
>> http://seven.pairlist.net/mailman/listinfo/techtoolslist
>> FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment
>> Archive site: http://seven.pairlist.net/pipermail/techtoolslist/
>>
>
>
_______________________________________________
Techtoolslist mailing list
Techtoolslist@flippers.com
http://seven.pairlist.net/mailman/listinfo/techtoolslist
FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment
Archive site: http://seven.pairlist.net/pipermail/techtoolslist/

_______________________________________________
Techtoolslist mailing list
Techtoolslist@flippers.com
http://seven.pairlist.net/mailman/listinfo/techtoolslist
FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment
Archive site: http://seven.pairlist.net/pipermail/techtoolslist/
Received on Sun Mar 31 23:12:17 2013