EPROM Eraser not erasing New EPROM

[mike mager]

Donald,

Thanks for the input.  I have, for no obvious reason, a minor interest in 
memory testing;  I just want to build 'nice' memory tests into a project, 
next time.  If you have any good references on the subject, please suggest 
them.  You are definitely correct about what I might call 'being careful'.

I said, "My whole point was "Can you _prove_ that you are really reading the 
memory?".

This was just a guess at a first approach, and a socketing problem _is_ a 
form of a 'open/grounded/shorted/stuck' bit (I argue!).


*The main good point is that he's got his memory erasing/programming!*


>Using 00 = 00, 01 = 01, etc isn't a good idea...

I concur, highly;  I was very careful to qualify the suggestion as "an 
ultra-simple first stage" - it certainly wasn't production code (laugh 
here!).  (But, then, who ever understands just what is meant in E-mail?)

I went on to say, "There are more stages, inverse patterns, combination 
patterns, and stuff, but can you really read it/write it at all?"

I'd like to see some sample code or algorythms for thorough diagnostic 
memory tests, but all I have is old (alright, _ancient_!) PC and AT BIOS 
listings.  Something out of a commercial memory test would be ju-u-ust 
right!

Mike
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