[time-nuts] Solartron 7081 ROMs
Joseph M Gwinn
gwinn at raytheon.com
Wed Apr 29 20:21:24 UTC 2009
time-nuts-bounces at febo.com 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
> Peter Vince
> On Tue Apr 28 15:40 , Brooke Clarke <brooke at pacific.net> 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
> >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
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> date=Apr 29, 2009 7:52:38 PM; subject=Re: [time-nuts] Solartron7081
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