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Title: bally s5500 problems with safe ram clear Post by: nsmith2901 on June 14, 2013, 09:33:50 PM I purchased a new set of mains u3,u4,u12,u15. i tried to do a safe ram clear but got no error code. are there different types of mains and maybe i purchased the wrong type?
when i used my original u3,u4 i got a successful clear. my old u12,u15 are corrupted and thats why i got a new set of mains. nsmith Title: Re: bally s5500 problems with safe ram clear Post by: MarkInAz on June 21, 2013, 08:22:58 PM I'll through in my 2-cents here and suggest you contact whom you purchased the new mains from and see what they can tell you.
Good luck. Title: Re: bally s5500 problems with safe ram clear Post by: nsmith2901 on June 22, 2013, 04:12:09 PM i think i know the reason that the new mains don't work. i found out that the speed of the eproms must match
the board speed. i think i bought eproms that were too fast for my board. i sent my board to be fixed to a friend i know that has older eproms for mains. Title: Re: bally s5500 problems with safe ram clear Post by: MarkInAz on June 22, 2013, 04:30:32 PM In my experience with the speed of a Eprom memory chips faster is not a problem, slower on the other hand can cause issues. Hopefully your friend will make some progress. If it was me I'd read out the check sum of the old & new chips and compair them for starters. But as for your original question about versions of mains I don't know. Maybe someone else here on NLG can answer that one. You could start a new thread asking specifically about that.
Good luck, Mark |