I am repairing 2 Boards from the same device with ST 27C256B eproms in them, and both of the eproms have a form of partial amnesia. Put them in a programmer,...
Declan Moriarty
junk_mail@...
Jun 15, 2006 1:50 pm
7093
How old are the eproms? To be more precise how long has it been since they were programmed? And are they nmos or already cmos? Pierre...
docydoc
docydoc@...
Jun 15, 2006 6:45 pm
7094
Hi, ... I think it is strange that whole bytes change. I would expect single bits to fail. What may have happened is "fast programming". In the old times ...
@Declan: Claiming to the ideas of what Pieter wrote: Have the eproms been exposed to radioactivity or xray or strong or high frequency electric fields or...
docydoc
docydoc@...
Jun 15, 2006 10:28 pm
7096
... To clear up some of the issues involved: I think this reply is closest. The parts are Eproms, with a silver label over them wrapped inside metal covers on...
Declan Moriarty
junk_mail@...
Jun 16, 2006 3:32 pm
7097
That device seems Not to exist, but I'm looking at 2 of them. Of course that isn't the first time this happened. Anyone else remember the Static Induction...
Declan Moriarty
junk_mail@...
Jun 18, 2006 7:36 pm
7098
You probably know all this, but...the CA series was originally RCA, later sold to Harris, and recently to Intersil. You might look at an old RCA book. Are...
I have a collection of old Harris data books dating back to 1984 and a few RCA data books (mostly discrete semis). Anyway, no reference to a CA362E. In the...
... Right on both counts :-(. No wonder it didn't exist I confess I did miscount the pins - 16. Hell, I was working on a Sunday, which is very bad for me. This...
Declan Moriarty
junk_mail@...
Jun 19, 2006 7:56 am
7101
Some time back I was looking for one of these. It seems I should have looked locally. Donberg www.donberg.ie have /beware of these links! MC68HC11FIFN and even...
Declan Moriarty
junk_mail@...
Jun 19, 2006 4:08 pm
7102
... The procedure was I think: pulse and test until the value had changed to zero and then pulse three extra times. The method lead to quite unreliable EPROM's...
Any of you engineering heads know offhand if eproms can be erased in a standard microwave oven? I'm sure somebody tried it, or knows exactly what would go...
Declan Moriarty
junk_mail@...
Jun 27, 2006 3:58 pm
7104
I doubt that microwave will do the job. Maybe a special dose of microwaves or defined length an power might do it. I know for sure that you can erase OTPs with...
docydoc
docydoc@...
Jun 27, 2006 6:59 pm
7105
... Not likely -- You can probably cook them in a uwave and destroy them but, erasing takes a certain flux of high energy photons in the u-violet spectrum....
... Thanks - no x-rays here - yet. I was thinking of this from 2 aspects. First of all, were mobile phones a danger to them, and/or mobile masts (and we seem...
Declan Moriarty
junk_mail@...
Jun 28, 2006 8:22 am
7107
I have been in the semiconductor industry since 1979, and am one of Jaaps' earliest fans and Chip Directory advertisers. I am currently an independent...
I've decided to get out of what I've been doing for 17 years over here in Ireland, and casting around for my next move. That can be employment, or self...
Declan Moriarty
junk_mail@...
Jul 11, 2006 10:19 am
7109
Holy Cow!!!!! have you ever seen the inside of a pinball machine ? you are very qualified to look at these things, simple repetition of circuits and bits are...
... Yep. Stone age stuff. ... Thanks for the reply. That business here is tied up closely with Poker machines. There's about two dozen pinball machines total...
Declan Moriarty
junk_mail@...
Jul 11, 2006 3:30 pm
7111
Hi Declan, Just an idea, just by yourself wether it is useable. Car service departments does not have much knowledge of electronics. So, here in the...
... Factors 1-3 are the real killers for this act. It's just a good feeling to be realistic - eventually....
Declan Moriarty
junk_mail@...
Jul 11, 2006 4:51 pm
7113
ah, i see i stay away from pokies too, such a moronic past time !!!! ... From: Declan Moriarty To: chipdir-l@yahoogroups.com Sent: Wednesday, July 12, 2006...
Hello, anybody knowing a good rule of thumb on how to dimension a snubber network that eats up the energy released by an inductive load being switched off ? ...
Hi Jan From the top of my mind: Resistor: 220 Ohm for 230Vac 470 Omh for 400Vac Capacitor: C[uF] >= 0.1*I[A] In other words, each Ampere needs a 0.1uF I don't...
What a disaster! To me it seems wise not to absorb the energy by a snubber circuit. The fluorescent lamps can do it by theirself and then the power is...
... http://www.national.com/an/AN/AN-776.pdf has a section on Snubber design. You can find a rather dated paper I did for Circuit Cellar Online years ago...
... I don't have any great advice for you, but want to let you know your not alone. I too would like to get out. Earlier this week the Boss Man at my current...
... [SNIP] ... Cut throat. We have Polish immigrants displacing the time-served Irish plumbers purely because they're cheaper. The Poles also have a good 'bush...
Declan Moriarty
junk_mail@...
Jul 13, 2006 8:34 am
7121
... You can't replace that Solenoid with a Solid State Relay, and save yourself a huge amount of sweat, could you? No snubber needed, as it opens at zero...
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