old RAM chips

[Lord_Bacon]

I helped an old scientist clean out some electronics equipment that was gathering dust in his closets.
I'm new to this, and I know very little about RAM chips, but I think these things are beautiful.
Purple ceramic, gold pins, silver colored heat sink

I did some research on the manufacturer: SEMi

SEMi was a subsidiary of the company Electronic Memories & Magnetics Corp. -- an integrated circuit maker with government/military contracts in the 70s and early 80s. In 1985 SEMi was bought by another military contractor named Titan Systems -- now a part of L-3 Communications.

Based on that history, I would guess that these chips must be at least 25-30 years old.

Here is a link to some photos:
http://www.flickr.com/photos/48865091@N04/

If anyone knows anything more about the company SEMi or these chips in particular -- history/value/applications etc. -- I'd love to learn more. As mentioned above, I'm very new to this so even very basic facts and figures would be appreciated.

[Elar]

Chips in the photo were made in 1977 week 26. They are 4Kbit static RAM's. Interesting part is that they are pin and voltage compatible to 4Kbit dynamic RAM down to the 12V positive level Chip Select signal.

[Lord_Bacon]

Thank you for the information.
It's very much appreciated.
If you don't mind my asking, I'm curious how you found this info. Do you have a book/reference manual or link to a database?
Thanks again for sharing your knowledge with me.

[Elar]

[johnorun]

Nice looking chips!