Bugbooks - Mark 80

From: Dwight Elvey <elvey_at_hal.com>
Date: Mon Jan 25 18:06:37 1999

ard_at_p850ug1.demon.co.uk (Tony Duell) wrote:
> >
> What's the real difference between a 1702 and a 1702A? I must admit that
> I am not a great one for historical correctness, so I tend to use
> 'updated' parts if I happen to have them to hand
>
> > Dwight
> >
> >
>
> -tony

Hi Tony
 1702's use a different programming algorithm than the
1702A's. Otherwise they work the same. Only a few
1702 were made, making them quite rare. Most have been
melted down for the gold that Intel used in
early packaging.
 I'm looking for the non-A types because I have an
old 4004 development system that has a programming
board on it. Of course, the board was designed to do
1702's and not 1702A's. It had a selector to select
another PROM type that looked like it would work but
the signal levels still were not correct. I suspect that
they intend it to work but didn't understand the changes
the chip designers were up to. It does part of the needed
changes but not all.
Thanks
Dwight
Received on Mon Jan 25 1999 - 18:06:37 GMT

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