[volt-nuts] Datron 1281 NVRAM woes

Todd Micallef tmicallef at gmail.com
Thu Apr 14 17:21:58 EDT 2016

I will get it this evening. Hope to be finished with work within the next
couple of hours.

On Thursday, April 14, 2016, Bert Kachler <bkachler at hotmail.com> wrote:

> Hi Todd and ??,
> thanks for your answers!
> I think it is a good suggestion to
> try to see first whether the Eproms are intact. Firmware is
> Version 3.11 and I have ordered new EProms to put
> a copy of the 3.11 firmware on them, the one
> from https://xdevs.com/fix/d1281/#manual .
> I will fire up my programmer the moment they arrive.
> What makes me ponder is that there were suddenly apparently
> two errors after a couple of month's inactivity.
> If two errors appear out of the blue more or less at the same
> time, IMHO it is likely that there is a common reason.
> Hence first the Eprom test. Then perhaps the voltages,
> I still need to figure out what they are supposed to be
> at the test points of the undocumented digital board.
> (I am not sure
> whether the NVRAM error came exactly at the same first turn-on
> as the "9005.7 No Rtx    001B42" error, because it
> flashes only briefly and I might have overlooked it at first.
> I only noticed it after a few subsequent turn ons, when I tried
> to made a picture to the "9005.7 No Rtx    001B42" error display.)
> Assuming that nothing of the above works, which is likely,
> then there is still the main question of what the "secondary" part of the
> NVRAM is supposed to be. If it happens just a secondary backup copy
> of the whoke memory, then there might be a chance to
> correct it (like for Solartron 7081 which does keep 2 copies of the data).
> I keep you posted. Thanks for your help.
> Cheers,
> Bert
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