[Techtoolslist] Eprom checksum

[David Shoemaker]

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



-----Original Message-----
From: techtoolslist-bounces at flippers.com
[mailto:techtoolslist-bounces at 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 at 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 at 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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