Fwd: [roys-tech-chat] Building replacement for TTL counter DM8552 (National Semiconductor)
Roy J. Tellason
rtellason at verizon.net
Thu Apr 10 16:38:37 CDT 2008
On Thursday 10 April 2008 17:28, Eric Smith wrote:
> I wrote:
> > It should be in the National Semiconductor 1974 (IIRC) "Logic" databook.
> > I don't have mine handy, but one could probably get a photocopy at
> > Halted in Sunnyvale.
> Roy wrote:
> > He's in Europe. :-)
> I pointed it out because:
> 1) It might be possible to find that databook (or another National
> Logic databook from that era) in a similar electronic surplus
> store elsewhere.
> 2) Someone on the list could go to Halted, get a copy, and scan it
> for him. I didn't volunteer to do that myself because I'm too
> busy right now, but if he doesn't get the real datasheet from
> somewhere else soon, I might be able to do it.
Ok, forwarded to my tech-chat list...
> > I don't recall offhand what the MC4040 was.
> IIRC, it's a (dual?) four-line demultiplexer.
I do have some old Motorola books around here someplace, but right now I have
no idea which box they're in. I notice that one's missing from my parts
pages, too. Perhaps one of these days I'll find the time to work on fixing
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
Information is more dangerous than cannon to a society ruled by lies. --James
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