Spare Chips

From: A.R. Duell <>
Date: Thu May 22 18:25:04 1997

> > > namely 1702s and 2532s, GET THEM. Today they are quite rare, tommorrow
> >
> > Don't forget the 2708 and the 3-rail 2716 (Texas Instruments).
> If anybody needs any of these, I've got perhaps a dozen 1702's,
> several dozen 2708's, and a couple 3-rail 2716's still kicking around.
> I've even got a couple of 2704's.

Hang on to them - you'll need them one day (but I hardly need to tell you
that, now do I :-)).

There was also a half-sized 2716 - i.e 1K * 8, but single supply rail. The
number was something like 2508, I think. I've seen one in use in an FTS-88
keyboard - if it ever fails, it gets replaced by 2716 with A10 soldered to


> My 1702A programmer is a unit based on a design from a mid-70's
> _Popular Electronics_ article. Toggle the addresses and data in

I found the articles on the PE 'CHAMP' (the first UK computer project) the
other day. One of the peripherals was the CHAMP-PROG - a 1702 programmer.
There's no hope of building it today (the whole thing is based round the
Intel 4040 and support devices), but I guess you could modify the design
if you were desparate.

> on the front panel, hit a button, and a series of RC-timed one shot's
> apply the thoroughly bizarre sequence of programming voltages.

Yes, the programming algorithm is somewhat strange....

The gates in my computer are AND,OR and NOT, not Bill
Received on Thu May 22 1997 - 18:25:04 BST

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