Digest for sci.electronics.repair@googlegroups.com - 3 updates in 2 topics

8:43 AM Penedão
Kaz Kylheku <kaz@kylheku.com>: Jan 08 02:53PM


>>If you have something to say, say it, don't reply to a really old >post.
 
>>This was isn't even the same model as someone was asking about >before. "
 
> I totally agree. Google should show ...
 
... a big disclaimer saying "... please, please, make every possible
effort to use a real newsreader connected to an NNTP server and
use this garbage service only in some sort of emergency."
jurb6006@gmail.com: Jan 08 10:10AM -0800

I misspoke, they are EEPROMs.
 
I would say mistype but that implies a typo, which it is not, I called them the wrong name.
 
Bottom line is I think you all got me talked into getting new EEPROMs for these things.
mike <ham789@netzero.net>: Jan 08 02:51AM -0800


> If it is a software thing, I got the EPROM copier and if it is likely to be software I need zero parts. Just put in a chip with a the good data and bam it is done. How long it lasts depends on alot of things, cosmic rays n shit. (I shit you not, there are articles on that, in fact should I put a foil tape on top ?)
 
> And what if I get cheap EPROMs and they go bad ?
 
> Well, that's the question. Start flashing the chips I got or get new ones ? Note that we also got rush jobs. Not really rush but they have been there long enough.
 
One symptom that EPROMS can exhibit is speed related.
You can test them all day in an EPROM programmer, but they still won't
work in the product. This was a problem in some early Compaq 386 laptops.
And some TEK instruments.
Reading the device in the programmer, then writing it back fixed 'em.
The laptop ones failed again eventually. As I recall, the designers
let some of the control lines on the prom float. I guess that allowed
some electrons thru to contaminate the bits. New chips soon exhibited
the same symptom.
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