Yes, Low supply voltage and slow access time might succeed with those old EPROMS. Best of luck Chris Stake
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Peter Vince Sent: 29 April 2009 20:50 To: [email protected]; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Solartron 7081 ROMs I'm sure there was a message on this group a month or two ago, where the bottom line was to read the EPROMs with a slightly lower than usual voltage. Peter Vince On Tue Apr 28 15:40 , Brooke Clarke <[email protected]> sent: >Hi Dave: > >I've read that there are some tricks to coaxing the data from memory >chips related to reading them under different conditions. > >It's a lot of work, but it's possible to disassemble the code. That >would allow it to be repaired. > >Have Fun, > >Brooke Clarke >http://www.prc68.com > > > >David C. Partridge wrote: >> This is a call to anyone who has a Solartron 7081 and has saved a copy of >> their ROMs (if you haven't you may end up in the same boat as I am - the one >> that's up the creek without a paddle). >> >> One of the ROMs on my earthy processor board has died. >> >> It would appear that the ROMs in this 7081 were updated to a high level of >> firmware at some stage in its life as the total ROM image size is greater >> than that of a set that was copied by Bill Ezell from his 7081 even though >> his meter has a higher serial number (461) than mine (180). >> >> The ICs in question and the CRC16 checksums (in hex) for my ROM set are: >> >> IC430 3238 >> IC415 C5C0 >> IC414 1260 >> IC413 B958 >> IC412 ED50 >> >> If you have saved your firmware ROM images, and the checksums for your ROMs >> match these, I would be immensely grateful if you could send me the image >> for IC414 (the middle one of the three). >> >> If as a result of reading this message you feel impelled to save your ROM >> images and find your checksums match these ... >> >> Obviously if I can't find a good image of that ROM, I'll just install the >> older firmware, but one never knows. >> >> Cheers, >> David Partridge _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
