PDP-11


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PDP-11

Programmed Data Processor model 11.

A series of minicomputers based on an instruction set designed by C. Gordon Bell at DEC in the early 1970s (late 60s?). The PDP-11 family, which came after, but was not derived from, the PDP-10, was the most successful computer of its time until it was itself succeeded by the VAX.

Models included the 11/23 and 11/24 (based on the F11 chipset); 11/44, 11/04, 11/34, 11/05, 11/10, 11/15, 11/20, 11/35, 11/40, 11/45, 11/70, 11/60 (MSI and SSI); LSI-11/2 and LSI-11 (LSI-11 chipset). In addition there were the 11/8x (J11 chipset) and SBC-11/21 (T11 chip) and then there was compatibility mode in the early VAX processors.

The B and C languages were both used initially to implement Unix on the PDP-11. The microprocessor design tradition owes a heavy debt to the PDP-11 instruction set.

See also SEX.
References in periodicals archive ?
He contributed to the development of the first single-chip PDP-11, the VAX8600 and a number of fault-tolerant servers.
He designed and prepared specifications and system drawings, created new software, and modified existing software as necessary for the application of DEC Microvax and PDP-11 computer-based systems for process control and monitoring.
s PDP-11 minicomputer to support real-time, bidirectional communications with the presses (see PT, Dec.
Three PDP-11s at the Florida plant now supervise 78 presses, while the smaller Puerto Rico and Texas facilities have one PDP-11 each.
A DEC PDP-11 computer and MTS computer interface provide test supervision, data acquisition, data analysis, amplitude control and function generation for the test system.
Wulf's research spanned programming systems and computer architecture; specific research activities included the design and implementation of a systems-implementation language (Bliss), architectural design of the DEC PDP-11, the design and construction of a 16-processor multiprocessor and its operating system, a new approach to computer security, and the development of a technology for the construction of high-quality optimizing compilers.
Their significant contributions to the industry include milestones such as the StrongARM, the Alpha, the uVAX and the PDP-11 processors.
While at DEC in the mid 70s, he helped design PDP-11 computers and operating systems.
Through ownership of Digitals PDP-11 software, Mentec is responsible for development and maintenance of operating system software (layered products) relating to PDP technology.
The file structure of Digital's early PDP-11 required that all files be contiguous.