Probably the most important test will be reduntdant mapping (where the same
region of the memory appears twice or more, meaning some part isn't working at
all) which indicates some sort of address/data interaction. Once you write a
test procedure, try letting an address line float and see what happens. Does
your test find it? Extend the test so it tests the device as a 4kx1. Does it
pass? There are lots of tests that do!
Dick
----- Original Message -----
From: "Loboyko Steve" <sloboyko_at_yahoo.com>
To: <classiccmp_at_classiccmp.org>
Sent: Friday, May 03, 2002 3:05 PM
Subject: Re: 2102 SRAM test circuit?
> It would probably be easy to program a PIC or UBICOM
> to GO/NOGO them. Maybe even look for bit pattern
> sensitivity or check for speed. I'm building old
> 8080/6800/8008 stuff, and I'm thinking of using these,
> but that's a lot of socket, wire wrap, board real
> estate, and time! Wow, do they use power also, even
> the low power ones. I prefer using 2114(L)'s, but
> those seem to have become a little scarcer and more
> expensive recently. OTOH, 2102's are very reliable. If
> you have a good #, I'd trade you a 6871 or 6875 - the
> 6800 clock chips, surprisingly hard to find/expensive
> - for some.
>
> --- Tothwolf <tothwolf_at_concentric.net> wrote:
> > I just came across a large number of loose 2102
> > chips in a junkbox, and
> > wondered if anyone has a schematic of a test circuit
> > for these. I'm not
> > sure how many of them there are yet, but they all
> > appear to be from the
> > same batch; AM9102BPC/P2102A-4 7632QD [32nd week,
> > 1976]. An couple
> > interesting facts I dug up on these chips is that
> > the AM9102 was AMD's
> > first RAM product, and it was first produced in
> > quantity in 1975.
> >
> > I'm thinking these chips might be a good source of
> > ram for a 6800 based
> > homebrew system, especially since I already have the
> > chips and lots of
> > wirewrap (and patience)...
> >
> > -Toth
> >
>
>
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Received on Fri May 03 2002 - 21:25:04 BST