[Moon-net] Help find intregrated circuits

[Edward Cole]

Your post struck a memory (human type):

I used some of these in the 1970's college class on 
micro-processors.  So I checked my TTL trays and found two 
MM2102AN-4L still stuck in aging and crumbling anti-static 
foam.  Condition unknown, but probably OK.  They were probably bought 
for some old project that is lost in cyberspace.

They are 1K static RAM.

Ken you may have them for whatever you feel they are worth to you 
(not much to me).  Realize they are "as-is" with no warranty to their 
condition.

Chris I do not have Ken's e-mail.  Would you forward for me?

73 Ed - KL7UW
PS:  I have a fair assortment of SN7400 series TTL

At 09:01 AM 5/6/2007, Chris Bartram wrote:
>Hello Ken
>
> > Can anyone help me find a 4040 ripple counter and a Siltronics 2102 memory
> > chip please?   Both are very old chips, but the alternative will be much
> > re-working of my memory keyer which has given up after years of service..
> > Can't find either of these chips in suppliers lists. Thanks,
>
>The 4040 is now called the 74HC4040, and is available from RS amongst other
>places. The only difference is that unlike 'real' 15V 4000 series CMOS is a
>5.5V supply limitation, however if your keyer operates from 5V that will be
>OK.
>
>The 2102 was, if I remember aright, a 1k static RAM chip. You'd probably find
>that difficult to locate now, although it might be worth a hunt around some
>of the vintage computer websites - there are guys who enjoy building archaic
>computers for fun!! There's a market for obsolete chips, but don't get
>caught-out by the big dealers who'll try to charge $100 - 200 for a part.
>You'd probably find that you could make a little adaptor board and use a
>modern static ram chip. If you just address the lines you need, and ground
>the others, then it should work OK. You'd need to look at data sheets to see
>what's involved.
>
>Hope you're well. I've noticed you on 'KST a couple of time since I got my
>antennas in the air again - they were down all winter. If you'd like a sked
>on 23, I have a simple system (~60W to a single 21dBi yagi) and I'd be
>delighted to have a try. Since coming back on, my QSOs have included a couple
>of 1000km+ contacts on 1296 and similar results on 432. The jewel has been
>CT3 by tropo on 2m...
>
>Vy 73
>
>Chris
>GW4DGU
>
>--
>Christopher Bartram MIET
>Christopher Bartram RF Design
>Blaenffos
>Pen-y-Bont
>CARMARTHEN
>SA33 6QG
>
>phone:          +44 1994 484650
>mobile:         +44 7968 193555
>email:          chris at chris-bartram.co.uk
>URL:            www.christopherbartramrfdesign.com
>
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73,
Ed - KL7UW
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