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From: jones@pyrite.cs.uiowa.edu (Douglas W. Jones,201H MLH,3193350740,3193382879)
Newsgroups: comp.arch
Subject: Object oriented architectures
Message-ID: <3215@ns-mx.uiowa.edu>
Date: 15 Nov 90 16:00:49 GMT
References: <2925@crdos1.crd.ge.COM>
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From article <2925@crdos1.crd.ge.COM>,
by davidsen@crdos1.crd.ge.COM (Wm E Davidsen Jr):
> 
> ... I believe that if you are looking at "production system which
> broke new groupd," then you would have to include the Intel 432.

The 432 only broke ground in the sense that it was a VLSI chipset.

The first production object oriented architecture was, as far as I know,
the Plessy System 250, a machine that I am convinced was designed as a
deliberate pun on the IBM 360 (subtract 1 from the nonzero digits of the
IBM part number to get the Plessy part number, use the same instruction
format, but with octal instead of hex, and therefore, only a 24 bit
word).

The Plessy System 250 was produced in fairly large numbers in the 1970s,
but for only one application, control of telephone switching systems.
Thus, it is a cousin of the AT&T computers built for similar purposes.
Unlike the AT&T machines, it supports a highly secure object oriented
architecture.
					Doug Jones
					jones@herky.cs.uiowa.edu