31 Mar
2000
31 Mar
'00
2:38 p.m.
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.
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)
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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31 Mar
31 Mar
3:44 p.m.
please see embedded comments below.
Dick
----- Original Message -----
From: Ethan Dicks <ethan_dicks(a)yahoo.com>
To: classiccmp list <classiccmp(a)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
=====
Even though my old e-mail address is no longer going to
vanish, please note my new public address: erd(a)iname.com
The original webpage address is still going away. The
permanent home is: http://penguincentral.com/
See http://ohio.voyager.net/ for details.
__________________________________________________
Do You Yahoo!?
Talk to your friends online with Yahoo! Messenger.
http://im.yahoo.com
3:48 p.m.
-> 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.
IIRC, this is the same as a 21L02, a lower power version of the 2102. AMD
just subs a 9 for a 2. 1024x1, BTW.
-> 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)
Sorry, can't help on this one.
-> I have a few of each, along with 2Kb of 21L02 chips (-2L and -4L speeds,
-> whatever they are)
-2L = 200ns, -4L = 400ns
-> -ethan
Bill
whdawson(a)mlynk.com
8814
days inactive
8814
days old
2 comments
3 participants
participants (3)
-
edick＠idcomm.com -
ethan_dicks＠yahoo.com -
whdawson＠mlynk.com