[email protected] wrote on 04/29/2009 03:50:12 PM: > 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.
Look up "schmoo plots", which are used to determine the temperature by supply voltage region over which a logic device will operate. Often these are contour maps showing highest operating frequency versus temperature and voltage. <http://en.wikipedia.org/wiki/Shmoo_plot> Joe Gwinn > 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. > > The following line is added for your protection and will be > used for analysis if this message is reported as spam: > > (Raytheon Analysis: IP=64.34.164.147; e-from=time-nuts- > [email protected]; [email protected]; > date=Apr 29, 2009 7:52:38 PM; subject=Re: [time-nuts] Solartron7081 ROMs) _______________________________________________ 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.
