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/
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/
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/
:) 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/
If you know what version you have, you can reprogram a bit-rotting eprom with the same code again, just to refresh the parts that have faded (and save erasing the whole thing first) On 01/04/2013 03:28, Jose Luiz Martins 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.
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/
On 03/31/2013 6:36 PM, David Shoemaker 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
Hi David, ROMSUM (DOS based) or ROMIdent (Windows based) are the answers to your question...ROMSUM gives you a checksum of any file that is run through it, ROMIdent compares the ROM image with it's data file to see what game it belongs to. As I recall it also gives a checksum. Download ROMSUM from: http://www.flippers.com/exe/romsum.zip Or ROMIdent from: http://arcarc.xmission.com/Utils/Rom%20Ident/ John :-#)# _______________________________________________ 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/
participants (4)
-
David Shoemaker -
John Robertson -
Jose Luiz Martins -
Mike Coates