Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!linus!wivax!decvax!microsof!fluke!ssc-vax!uw-beaver!cornell!vax135!ariel!hou5f!hou5a!hou5d!hogpc!houxm!hocda!spanky!burl!duke!mcnc!idis!pitt!hoffman 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]