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From: hoffman@pitt.UUCP
Newsgroups: net.micro
Subject: Re: Ah, yes, the Pdp-7.
Message-ID: <510@pitt.UUCP>
Date: Wed, 29-Jun-83 06:49:30 EDT
Article-I.D.: pitt.510
Posted: Wed Jun 29 06:49:30 1983
Date-Received: Thu, 7-Jul-83 00:44:55 EDT
References: wdl1.178
Lines: 14

With all of this discussion of the PDP-7 and its kin, I just
had to add that we still have a PDP-4.  Since there were only
45 of these ever built, I wonder how many more are still around.
Ours is a PDP-4B, s/n 32.  It has a paper tape reader/punch,
crt display with light pen, DECtapes, and a TTY28 console.
Internally, it has 4K 18-bit words of core memory, an extended
arithmetic element (mul, div, shift), and an A/D converter.
The PDP-4 does, by the way, have *both* one's complement (ADD)
and two's complement (TAD) arithmetic.
It plays a mean game of Space War...

	---Bob (Don't throw that old computer out!) Hoffman
		pitt!hoffman,  hoffman.pitt@Udel-Relay
		[Founding member of The Computer Museum]