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Main => Software Forum => Topic started by: cyork2 on July 22, 2009, 10:28:18 am

Title: Simpsons gives EEPROM Error?
Post by: cyork2 on July 22, 2009, 10:28:18 am

I can run The Simpsons on my laptop with no error but on my cab the same file and MAME version (0.132) gives me an EEPROM error -- as it is checking through the eeproms it marks one as BAD then after checking the others it resets.

Any idea why it would be different?

Thx,
Craig

Title: Re: Simpsons gives EEPROM Error?
Post by: TAG on July 22, 2009, 12:40:31 pm

Have you tried holding down "F2" during startup to initialize the EEPROM?

Title: Re: Simpsons gives EEPROM Error?
Post by: cyork2 on July 23, 2009, 12:33:50 am

Thanks - that worked.. then I didn't have to do it again after restarting which I don't get but I'm happy.

thank you

Title: Re: Simpsons gives EEPROM Error?
Post by: Beretta on July 23, 2009, 04:36:28 am

im gonna guess since it's the first run of the game that it can't read it's NVRAM (thats non-volatile ram) it keeps settings values such as high scores and coinage options, kinda like flash memory except it needs steady voltage to keep it's data.

so since it's the first run it can't read them and has a error, it then needs to create default values.

same thing would happen to a real machine if it's battery died, not unlike a computers bios/clock settings.

if you've never had a computer with it's battery die just wait.. they only last about 5 years.. especially if it's been sitting unpluged.

some arcade boards out there had suicide batteries, the encryption tables was held in NVRAM, when the battery died the encryption key's was lost.. and the board was dead unless either the encryption tables was reloaded or a non encrypted set of roms was installed...

interesting stuff, google "dead battery society"