Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!usc!cs.utexas.edu!uunet!littlei!intelhf!ichips!omews34!rmb
From: rmb@omews34.intel.com (Bob Bentley)
Newsgroups: comp.arch
Subject: Re: XDS940 computer (or Xerox Sigma 9)
Keywords: Xerox,defunct,history
Message-ID: <1991Jun12.002728.19738@ichips.intel.com>
Date: 12 Jun 91 00:27:28 GMT
References: <1991Jun5.231450.25856@digi.lonestar.org>
Sender: news@ichips.intel.com (News Account)
Organization: Intel Corp., Hillsboro, Oregon
Lines: 25

In article <1991Jun5.231450.25856@digi.lonestar.org> crichmon@digi.lonestar.org (Charles Richmond) writes:
>A friend of mine in college told me about the Sigma 9 computer
>that he used at his previous university.  He said it was great
>for interactive use.  I believe that the computer was designed
>by Scientific Data Systems (SDS).  Later this company sold
>out to Xerox and became Xerox Data Systems (XDS).  I would
>like to know more about the hardware and software of the Sigma 9
>and perhaps its sibling, the Sigma 7.  
>

There's a fairly good description of the XDS-940 in "Timesharing Systems Design
Concepts" by Richard W. Watson, published in 1970 by McGraw-Hill.  Quoting
from the blurb on the cover flap:

"Special features include: the detailed coverage of principal aspects of
operating system design; the use of examples from two computer systems, XDS-940
and GE-645 Multics, for the bulk of its illustrations; and a cogent discussion
of the difficult, and often misunderstood, concept of segmentation."

An oldy but a goody!

	Bob Bentley
 	Intel Corp., M/S JF1-58			E-mail: rmb@ichips.intel.com 
 	5200 N.E. Elam Young Parkway		Phone:  (503) 696-4728          
 	Hillsboro, Oregon 97124			Fax:    (503) 696-4515