In search of MM57109 by National Semi

[Eric Smith]

Dan wrote:
> Would anyone have any of the MM57109 numerical processor chips ?

At one time I had a tube of them, but alas, no longer do.

Octopart reveals that one of the parts brokers lists them:

http://www.area51esg.com/search-semiconductorss-capacitors-resistors.htm?part=MM57109N&submit2=Search

Good luck actually getting any, though.  I haven't tried this
particular broker, but none of the ones I've tried in the past would
respond to an RFQ.  Apparently even $250 per line item isn't enough
to interest them.

I think the MM57109 was an MM5799 with a particular ROM mask,
though that won't help you since no MM5799-labelled part will do
what you want.  The MM5799 was from National's original COPS
family, which predated the COP4xx family.

There was a later MM57409 "Super Number Cruncher" that used the
same general concept but was not pin or software compatible.  It was
NMOS rather than PMOS, so it was probably faster than the MM57109.
I've never been able to find one, or evidence that it was designed
into any products, though some of the brokers claim to have them.
>From the data sheet it appears to be a COP440.

Eric