drives. Primenet (Token Ring) network connected all CAD stations in a building with its Data Collector. Ford pushed PDGS out to its suppliers and engineering contractors throughout the northern Midwest. Prime gained expertise over the years with its collaboration with Ford and continued to expand into the CAD market with its Medusa product. With the acquisition of ComputerVision, Prime appeared to be a formidable force in the CAD/CAM industry. Prime Medusa versions 5 and CV Medusa 7 were merged/recombined into a product that was called Medusa version 12. Prime also picked up Calma CAD systems from GE. Electronic messaging Electronic messaging was developed on relay.prime.com, which was the hub that relayed global electronic mail for Prime Computer. The software used on this computer system, PDN Mail, developed by Robert Ullmann, was designed to use the encoding header field that was later explained in a Request for Comments. PDN Mail was also used by Microsoft Corporation until MIME was introduced. Before MIME existed, PDN Mail was able to perform the same functions and was used to send software updates as well as all sorts of attachments between systems. In August 1993, Robert Ullmann, David Robinson and Al Costanzo wrote RFC 1505. This RFC, documented the Encoding Header Field for Internet Messages that PDN mail used and was published by the RFC editor, Jon Postel that same year. Marketing A series of memorable advertisements created by Australian artist Rone Waugh in 1980 featured actors Tom Baker and Lalla Ward as their characters from the TV series Doctor Who. All four of these adverts have since been included on the DVD release of the 1979 serial Destiny of the Daleks in which both actors appear. Photos Photos of several Prime systems RI Computer museum: 2450, 2850, 5340, and 9650. a Prime 750 See also PRIMOS References External links History of Prime Computers What Happened to Prime Computer by David Mandel; last available version of 27 September 2007 via the Internet Archive Prime Computer Corner of Malcolm Hoar, incl. Comp.Sys.Prime FAQ Prime 300 marketing material c1975 ICF Prime computers 1972 establishments in Massachusetts 1998 disestablishments in Massachusetts 1998 mergers and acquisitions American companies established in 1972 American companies disestablished in 1998 Computer-aided design software Computer companies established in 1972 Computer companies disestablished in 1998 Defunct computer companies based in Massachusetts Defunct computer companies of the United States Defunct computer hardware companies Defunct software companies