[Techtoolslist] Eprom checksum

[Jose Luiz Martins]

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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