please see embedded comments below.
Dick
----- Original Message -----
From: Ethan Dicks <ethan_dicks_at_yahoo.com>
To: classiccmp list <classiccmp_at_classiccmp.org>
Sent: Friday, March 31, 2000 9:38 PM
Subject: IC ID help needed
>
> I've done the basic digging (www.chipdir.com, etc.) and can't find info
> on the following chips I found in a box of stuff some one gave me a while
> back:
>
> AMD 91L02 - I know it's some kind of SRAM but not the size or pinout. The
9101
> is 256x4. This one is likely to be either 1024x1 or 1024x4 but I don't
know
> which.
>
This one's a regular 21L02 as made by AMD. That's a 1K-bit by 1 SRAM with
separate D and Q.
>
> NS 74C921 - The 74C922 and 74C923 are somewhat common keyboard encoders,
one
> of which was used on the Netronics Elf-II design. I can't find any info
on
> the pinout of the 74C921, but I did find several places selling them from
> $6 USD to 72 Danish Kroner (however much that is)
>
It's not in my National CMOS databook, though the 922 and 923 as well as the
numbers below are represented. The 74C-series was a National Semiconductor
line which I believe they had pretty much to themselves. My data book is of
1988 date. I don't know why it's not in the book, unless perhaps it was
already dead and buried in '88.
>
> I have a few of each, along with 2Kb of 21L02 chips (-2L and -4L speeds,
> whatever they are), all with 1979 - 1983 date codes.
>
> Any clues?
>
> Thanks,
>
> -ethan
>
>
> =====
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>
> The original webpage address is still going away. The
> permanent home is: http://penguincentral.com/
>
> See http://ohio.voyager.net/ for details.
>
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Received on Fri Mar 31 2000 - 23:44:22 BST