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Re: [N8VEM-S100:588] Re: S-100 8086 Up and Running
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- Subject: Re: [N8VEM-S100:588] Re: S-100 8086 Up and Running
- From: Bill Lewis <wrl...@gmail.com>
- Date: Tue, 27 Dec 2011 08:52:55 -0500
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35 years ago I left a 2716 or 2532 or something of that ilk outside
"in the sun" for a week. Granted, this was in gloomy Upstate NY.
But it was not erased.
Question on erasing though. Is exposure cumulative?
If you put a chip in the eraser for 1/2 the require time, and stop.
When you start again, will it require the full time, or only half?
On Mon, Dec 26, 2011 at 11:28 PM, John Monahan <mon...@vitasoft.org>
FWIW Leon, the newer high capacity EPROMS have tiny cells and so are much
more susceptible to UV exposure. The old 2716's etc. were hard to erase even
with a proper UV lamp! Remember with erasing, you move electrons into an
isolated charged island on a silicon insulator. It's not an all or nothing
effect, as the charge builds up the cells with 0's will be unreliable at
high speed reads.