recover data from damaged eeprom?
Russell McMahon email (remove spam text)
> > *> The same like used by the russians when they have copied the 8080
> > a *>looong time ago:
> Now lets try to be honest. Nobody in common sense will use a tunneling or
> deep probe microscope to duplicate a 8080... think about it... how
> difficult is to design a microprocessor?
> Think seriously about it.
> Even you can do it pretty easily. What is the worse part? To have the way
> to produce the wafers, right? not the design. ...............
I'm certainly not wanting to get into an argument here, but it has always
been my understanding that in the earlier days of microprocessors there was
indeed quite a lot of copying at a fairly low level. Nowadays you can hire a
few of the better graduates (or some of someone else's better engineers
:-) ) and be well on the way to rolling your own.
I think the point is that *in its day* the 8080 (or the 4004 / 8008 / ...)
was fairly leading edge and as it was also the market leader and ensuring a
very high level of computability was essential. I have read some extremely
interesting accounts of what was involved in getting early processors to
meet desired specs. One was the 80C86 from Intel themselves - the insides of
this in many places bore no relationship to the NMOS part (or to something
based on sound engineering practices IMHO :-) ). Another was a book ?"The
soul of a machine" or something like that about the Data General ?Nova
computer development where they were trying to beat the DEC VAXs on at least
a few instructions. They did, but the kluges required were immense. Neither
of these examples involved copying other people's designs directly but the
amount of non-straight-forward engineering to get the desired result was
immense. In the case in question, being able to copy an existing part for an
IC design would probably be a great help.
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