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PDP
PDP is an abbreviation for Programmable Data Processor; they were a series
of computers, several of them ground-breaking and very influential, made by
Digital Equipment Corporation. They were given that name because at the time
of their introduction, computers had a reputation of being large and
expensive machines, and the PDP machines were aimed at a market which
couldn't afford the larger computers.
Some of the PDP machines are related to each other in families; but most
have little more in common than having been made by the same company.
PDP Series
Members of the PDP series include:
* PDP-1: The original PDP, an 18-bit machine used in early time-sharing
operating system work, and prominent in early hacker culture. One of
the first computer games, Spacewar, was developed for this machine.
* PDP-4: Supposed to be a slower, cleaper alternative to the PDP-1, but
not commercially successful; all later PDP 18-bit machines were based
on its instruction set.
* PDP-6: 36-bit timesharing machine. It was considered a mainframe,
although small by today's standards.
* PDP-7: Replacement for the PDP-4; DEC's first wire-wrapped machine. The
first version of Unix was for this machine.
* PDP-8: 12-bit machine with a tiny instruction set; DEC's first wildly
successful computer. The first successful "personal computer", many
were purchased by schools, university depts, and research labs; also
used in the DECmate word processor and the VT-78 workstation.
* LINC-8: A hybrid of the LINC and PDP-8 computers; two instruction sets.
Progenitor of the PDP-12.
* PDP-9: Successor to the PDP-7, DEC's first micro-programmed machine.
* PDP-10: 36-bit timesharing machine, and fairly successful over several
different models. The instruction set was a slightly elaborated form of
that of the PDP-6.
* PDP-11: 16-bit machine, widely regarded as the best 16-bit instruction
set ever created, and another huge hit for DEC. Also the LSI-11,
primarily for embedded systems. The VAX series was descended from it.
* PDP-12: Descendant of the LINC-8.
* PDP-14: A 12-bit machine intended as an industrial controller.
* PDP-15: DEC's final 18-bit machine.
Related computers:
* LINC (Laboratory Instrument Computer), originally designed by MIT's
Lincoln Labs, some built by DEC. Not in the PDP family, but important
as progenitor of the PDP-12.
The LINC and the PDP-8 can be considered the first minicomputers, and
perhaps the first personal computers as well. The PDP-8 and PDP-11 were the
most popular of the PDP series of machines.
Digital never made a PDP-20, although the term was sometimes used for a
PDP-10 running TOPS-20.
This content from Wikipedia is licensed under the GNU Free Documentation License.
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