[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 
and voltage.

<http://en.wikipedia.org/wiki/Shmoo_plot>

Joe Gwinn

 
> 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
> >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
> 
> 
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> date=Apr 29, 2009 7:52:38 PM; subject=Re: [time-nuts] Solartron7081 
ROMs)




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