3 May
2002
3 May
'02
9:25 p.m.
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(a)yahoo.com>
To: <classiccmp(a)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(a)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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