PDP-7

A modified PDP-7 under restoration in Oslo, Norway

The DEC PDP-7 is a minicomputer produced by Digital Equipment Corporation. Introduced in 1965, the first to use their Flip-Chip® technology, with a cost of only $72,000 USD, it was cheap but powerful. The PDP-7 was the third of Digital's 18-bit machines, with essentially the same instruction set architecture as the PDP-4 and the PDP-9. It was the first wire-wrapped PDP.

In 1969, Ken Thompson wrote the first UNIX system in assembly language on a PDP-7, then named Unics as a somewhat treacherous pun on Multics, as the operating system for Space Travel, a game which required graphics to depict the motion of the planets. A PDP-7 was also the development system used during the development of MUMPS at MGH in Boston a few years earlier.

There are a few remaining PDP-7 still in operable condition, along with one under restoration in Oslo, Norway.

External links

• Raymond, Eric Steven (2003-09-19). "Origins and History of Unix, 1969-1995". faqs.org. Retrieved 2008-07-13.
• http://www.bell-labs.com/history/unix/pdp7.html "The famous PDP-7 comes to the rescue" (Bell Labs' Unix history).
• http://research.microsoft.com/~gbell/Digital/timeline/1964-3.htm PDP-7 entry from Year 1964 in the DIGITAL Computing Timeline.
• http://heim.ifi.uio.no/~toresbe/dec PDP-7 restoration project located in Oslo, Norway.
• http://dictionary.reference.com/browse/PDP-7 general information for the computer system.
• http://www.soemtron.org/pdp7.html information about the PDP-7 and PDP7A including some manuals and a customer list covering 99 of the 120 systems shipped.