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 
that...   :-)

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 
M Dakin

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