[volt-nuts] Solartron 7081 randomly re-initialises

Chuck Harris cfharris at erols.com
Thu Apr 14 11:19:36 EDT 2016

What Poul-Henning is alluding to is an EPROM is a device where
data bits are stored in little buckets of charge.  How full a
bucket is determines whether it is a "1" or a "0".  How full the
bucket appears to be depends on the 5V supply going to the chip.

If the EPROM has leaked off much of the charge from the buckets,
small changes in the 5V supply can make the difference between
the EPROM reading the data correctly, and not.

Parts that display this problem can very often be fixed by
lowering the VCC supply to the EPROM when reading the part into
the programmer, erasing the chip, and then writing it in a normal

-Chuck Harris

Poul-Henning Kamp wrote:
> --------
> In message <001501d19632$743ab230$5cb01690$@perdrix.co.uk>, "David C. Partridge
> " writes:
>> Does anyone have any thoughts as to likely faults that would cause this?
> EPROMs loosing bits is a good candidate.

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