Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 11/03/84 (WLS Mods); site escher.UUCP Path: utzoo!watmath!clyde!burl!ulysses!allegra!princeton!astrovax!escher!doug From: doug@escher.UUCP (Douglas J Freyburger) Newsgroups: net.space Subject: Re: interplanetary computers Message-ID: <70@escher.UUCP> Date: Sun, 26-Jan-86 16:42:54 EST Article-I.D.: escher.70 Posted: Sun Jan 26 16:42:54 1986 Date-Received: Mon, 27-Jan-86 03:05:12 EST References: <564@smeagol.UUCP> Distribution: net Organization: NASA/JPL, Pasadena, CA Lines: 26 ->Discussion about using Rad-hard RCA 1802's on Galileo and ->also some bit-slice processors, to by Rick Kwan, JPL Spacecraft ->Data Systems group When I was in one of the VLSI design groups doing a Mariner Mark II chip at JPL, one of the things we were constantly told about was how 3 different companies did rad-hard 2901's for use on Galileo. The 2901 is a 4-bit machine used in all sorts of bit-slice designs. Galileo is carrying over a dozen each of 1802s and 2901s. RCA, Sandia, and "I forgot" did the Galileo chips. The Mariner Mark II series will carry 80C86 or 32C016s most likely. The 1802 and 2901 are very dependable machines, but are hard to use. It demostrates the NASA can't afford to fix it beyond Earth orbit. Remember that the 1802 was the latest and greatest about 10 years ago and it will be about 10 years until today's latest and greatest is reliable enough to launch. -- Doug Freyburger DOUG@JPL-VLSI, JPL Mail Stop 23 escher!doug, escher!teleop!doug Pasadena, CA 91109 etc.