[time-nuts] Solartron 7081 ROMs

Brooke Clarke brooke at pacific.net
Tue Apr 28 14:40:09 UTC 2009

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 <===== It is this one I want
>  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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