SDS/XDS Sigma systems

[Chuck Guzis]

On 4 Aug 2008 at 23:26, Eric wrote:

> The correct Sigma device(s) consisted of, for example, the Sigma 5,
> Sigma 7, and Sigma 9 (was there a Sigma 2?) made by Scientific Data
> Systems (SDS), which was bought out by Xerox in 1969 and subsequently
> named Xerox Data Systems (XDS).
> 
> Then, after Xerox abandoned the mainfame industry (circa 1974) --
> Honeywell came into the picture and provided service engineering
> contracts and maintenance for their products and existing clients.
> 
> In other words, the OP is looking out for mainframe type products (or
> minicomputer computer products, depending on your definition of
> exactly what defines a mainframe vs. minicomputer in this context :-)

Boy, that name goes back quite a ways  My friends at Lockheed (LMSC) 
in Sunnyvale used a couple of those in the 1970s. SDS->XDS is right.

Here's some more information on the SDS machines:

http://www.andrews.edu/~calkins/profess/SDSigma7.htm

Cheers,
Chuck