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From: jones@pyrite.cs.uiowa.edu (Douglas W. Jones,201H MLH,3193350740,3193382879)
Newsgroups: comp.arch
Subject: Re: Looking for a really odd computer
Message-ID: <2632@ns-mx.uiowa.edu>
Date: 9 Oct 90 13:48:01 GMT
References: <14900017@hpdmd48.boi.hp.com>
Sender: news@ns-mx.uiowa.edu
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From article <14900017@hpdmd48.boi.hp.com>,
by sritacco@hpdmd48.boi.hp.com (Steve Ritacco):
> It is my understanding that DEC actually made a few 18 bit word machines.

Check out the PDP-9 and PDP-18.  The latter was a UNIBUS based 18 bit machine
with fairly nice support for both two's complement arithmetic and one's
complement arithmetic (don't ask why, I don't know).  PDP-18 machines were
fairly widely used for real-time control in some areas.  Back in 1974, I had
a friend who used one regularly, I've never had the pleasure.

					Doug Jones
					jones@herky.cs.uiowa.edu