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Series of 16-bit minicomputers
The PDP-11 is a series of 16-bit minicomputers originally sold by Digital Equipment Corporation (DEC) from 1970 into the late 1990s, one of a set of products
PDP-11
Instruction set architecture developed by Digital Equipment Corporation
The PDP-11 architecture is a 16-bit CISC instruction set architecture (ISA) developed by Digital Equipment Corporation (DEC). It is implemented by central
PDP-11_architecture
36-bit computer by Digital (1966–1983)
Digital Equipment Corporation (DEC)'s PDP-10, later marketed as the DECsystem-10, is a mainframe computer family manufactured from 1966, delivered from
PDP-10
The PDP-11/73 (strictly speaking, the MicroPDP-11/73) was the third generation of the PDP-11 series of 16-bit minicomputers produced by Digital Equipment
PDP-11/73
Name used for several lines of minicomputers
PDP-4 → PDP-7 → PDP-9 → PDP-15 12-bit: PDP-5 → PDP-8 → PDP-12 36-bit: PDP-6 → PDP-10 → DECsystem-10 → DECsystem-20 16-bit: PDP-11 [→ 32-bit: VAX] PDP-1
Programmed_Data_Processor
Minicomputer product line
PDP-12 is an offshoot of the PDP-8 with a processor that can run programs for the PDP-8 and LINC systems. The successor to the PDP-8 line is the PDP-11
PDP-8
American computer manufacturer (1957–1998)
The company produced a series of machines known as the PDP line, with the PDP-8 and PDP-11 being among the most successful minis in history. Their success
Digital_Equipment_Corporation
18-bit computer by Digital, 1970–79
PDP-1. More than 400 were ordered within the first eight months. A later model, the PDP-15/76, was bundled with a complete PDP-11, allowing the PDP-15
PDP-15
Type of computer instruction set
Elsevier. p. 151. ISBN 9780080502526. "Introduction to the PDP-11". University of Sydney. "PDP-11 instruction reference" (PDF). University of Toronto. "Another
Orthogonal_instruction_set
Order of bytes in a computer word
and integer values in the optional floating-point processor of the PDP-11/45, PDP-11/70, and in some later processors, stored 32-bit double precision integer
Endianness
Computer company focused on DEC's PDP-11
Computer Systems Limited was a subsidiary of Mentec Limited that repackaged PDP-11 processors. Mentec Inc. was a US-based subsidiary of Mentec Limited. In
Mentec
Procedural programming language
address. As machines with ASCII processing became common, notably the DEC PDP-11 that arrived at Bell Labs, support for character data stuffed in memory
B_(programming_language)
Multiprocessor computer system where not all of the CPUs are treated equally
Equipment Corporation developed, but never released, a multiprocessor PDP-11, the PDP-11/74, running a multiprocessor version of RSX-11M. In that system, either
Asymmetric_multiprocessing
1979 minicomputer operating system
1980s. V7 was originally developed for Digital Equipment Corporation's PDP-11 minicomputers and was later ported to other platforms. Unix versions from
Version_7_Unix
Family of computer operating systems
RSX-11 is a discontinued family of multi-user real-time operating systems for PDP-11 computers created by Digital Equipment Corporation. In widespread
RSX-11
Line of computers sold by Digital Equipment Corporation
memory while still being compatible with unmodified user mode PDP-11 code. The name "VAX-11", used on early models, was chosen to highlight this capability
VAX
Original Unix operating system from Bell Labs
Unix refers to the early versions of the Unix operating system for DEC PDP-7, PDP-11, VAX, and Interdata 7/32 and 8/32 computers, developed in the Bell Labs
Research_Unix
Symposium on Operating Systems Principles where Unix was first presented. A PDP-11/45 was bought to run the system, but for budgetary reasons, this machine
History of the Berkeley Software Distribution
History_of_the_Berkeley_Software_Distribution
Real-time operating system
RT-11 (Real-time 11) is a discontinued small, low-end, single-user real-time operating system for the full line of Digital Equipment Corporation PDP-11 16-bit
RT-11
Microsoft Unix operating system
licensed from AT&T Corporation in the late 1970s. UNIX System V ran on the PDP-11 minicomputer. Microsoft ported the source code so the operating system could
Xenix
Layer of hardware-level instructions or data structures
Equipment Corporation PDP-9 processor, KL10 and KS10 PDP-10 processors, and PDP-11 processors with the exception of the PDP-11/20, are microprogrammed
Microcode
Family of computer operating systems
retrospectively referred to as "Research Unix", ran on computers such as the PDP-11 and VAX; Unix was commonly used on minicomputers and mainframes from the
Unix
1971 arcade game
000 in 2025) to build. It consisted of a Digital Equipment Corporation PDP-11 minicomputer attached by a cable to a wooden console with a monitor, controls
Galaxy_Game
Part of a computer system
and AMD processors. Several models of the PDP-11, such as the PDP-11/45, PDP-11/34a, PDP-11/44, and PDP-11/70, supported an add-on floating-point unit
Floating-point_unit
Series of discontinued Unix operating systems by DEC
systems for the PDP-11, VAX, MicroVAX and DECstations. The initial development of Unix occurred on DEC equipment, notably DEC PDP-7 and PDP-11 (Programmable
Ultrix
received funding for a PDP-11/20. For the first time in 1970, the Unix operating system was officially named and ran on the PDP-11. A text-formatting program
History_of_Unix
Central computer component that executes instructions
PDP-8/I and KI10 PDP-10 also switched from the individual transistors used by the PDP-8 and KA PDP-10 to SSI ICs, and their extremely popular PDP-11 line
Central_processing_unit
Radiotherapy machine involved in six accidents
collaborated on the construction of linear accelerators controlled by a DEC PDP-11 minicomputer: the Therac-6, which produced X-rays of up to 6 MeV, and the
Therac-25
Unix operating system
Symposium on Operating Systems Principles where Unix was first presented. A PDP-11/45 was bought to run the system, but for budgetary reasons, this machine
Berkeley Software Distribution
Berkeley_Software_Distribution
Type of mainframe computer
as a way of differentiating them from the PDP-11. Later on, those systems running TOPS-20 (on the KL10 PDP-10 processors) were labeled DECSYSTEM-20 (the
DECSYSTEM-20
6th Edition of Research Unix alias UNIX Time-Sharing System
Bell Labs. Like its direct predecessor, the sixth edition targeted the DEC PDP-11 family of minicomputers. It was superseded by Version 7 Unix in 1978/1979
Version_6_Unix
Text typesetting markup software
"transliterated" by Ken Thompson into PDP-7 assembler language for his early Unix operating system, circa 1970. When the first PDP-11 was acquired for Unix in late
Roff_(software)
Process of starting a computer
MRV11-D ROM memories, all usable as bootstrap ROMs. The PDP-11/34 (1976), PDP-11/60 (1977), PDP-11/24 (1979), and most later models include boot ROM modules
Booting
Computer operating system
now part of Hewlett-Packard) for the PDP-11 series of 16-bit minicomputers. The first version of RSTS (RSTS-11, Version 1) was implemented in 1970 by
RSTS/E
Magnetic tape data storage medium
Corporation computers, including the PDP-1, PDP-4, PDP-6, PDP-8, LINC-8, PDP-9, PDP-10, PDP-11, PDP-12, and the PDP-15. On DEC's 32-bit systems, VAX/VMS
DECtape
General-purpose programming language
Eventually, they decided to port the operating system to a PDP-11. The original PDP-11 version of Unix was also developed in assembly language. Thompson
C_(programming_language)
Systems programming language
Corporation (DEC) developed and maintained BLISS compilers for the PDP-10, PDP-11, VAX, DEC PRISM, MIPS, DEC Alpha, and Intel IA-32, The language did
BLISS
Mid-1960s–late-1980s class of smaller computers
this space. By the early 1970s, most minis were 16-bit, including DEC's PDP-11. For a time, "minicomputer" was almost synonymous with "16-bit", as the
Minicomputer
Family of programming languages
terminals. This general model became popular on minicomputer systems like the PDP-11 and Data General Nova in the late 1960s and early 1970s. Hewlett-Packard
BASIC
Discontinued UNIX variant
PWB/UNIX 2.0, CB UNIX 3.0, UNIX/RT and UNIX/32V. System III supported the DEC PDP-11 and VAX computers. The system was apparently called System III because it
UNIX_System_III
PDP-11-based personal computer (1982)
(PRO-325), Professional 350 (PRO-350), and Professional 380 (PRO-380) are PDP-11 compatible microcomputers. The Pro-325/350 were introduced in 1982 and the
DEC_Professional
Abstract data type
processors, such as the PDP-11, VAX, and Motorola 68000 series have addressing modes useful for stack manipulation. The following trivial PDP-11 assembly source
Stack_(abstract_data_type)
Family of superminicomputers by Digital
mode PDP-11 code (thus the -11 in VAX-11), offering an upward compatible path for existing customers. The first machine in the series, the VAX-11/780,
VAX-11
Assembly language with macro facilities
version of the PDP-11 assembly language without macro facilities. MACRO-11 was supported on all DEC PDP-11 operating systems. PDP-11 Unix systems also
MACRO-11
Nigeria. Retrieved 2023-07-05. Nliam, Amaka (2023-06-11). "10th Assembly: Gombe Rep Emerges PDP Consensus Candidate for Minority Whip". Voice of Nigeria
List of members of the House of Representatives of Nigeria, 2023–2027
List_of_members_of_the_House_of_Representatives_of_Nigeria,_2023–2027
Dialect of the BASIC Programming Language
Corporation (DEC) for use on its RSTS/E time-sharing operating system for the PDP-11 series of 16-bit minicomputers in the early 1970s through the 1980s. BASIC-PLUS
BASIC-PLUS
Character encoding
36-bit machine word (PDP-6, PDP-10/DECsystem-10, DECSYSTEM-20), three characters plus two additional bits into one 18-bit word (PDP-9, PDP-15), or three characters
DEC_RADIX_50
Operating system
version of DOS-11 (V08-02) was released in 1970 and was the first operating system to run on the Digital PDP-11 minicomputer. DOS-11 was not known to
DEC_BATCH-11/DOS-11
Operating system
written for the PDP-11 by P. J. Plauger, who started working on Idris in August 1978. It was binary compatible with Unix V6 on PDP-11, but it could run
Idris_(operating_system)
Semi-automatic pistol
The Walther PDP (Performance Duty Pistol) is a striker-fired semi-automatic pistol designed by Walther Arms in 2021 as a replacement for the Walther PPQ
Walther_PDP
Metadata tag prefixed with #
was used to denote immediate address mode in the assembly language of the PDP-11 when placed next to a symbol or a number, and around 1973, '#' was introduced
Hashtag
American computer scientist known for Unix (born 1943)
and I worked on all the rest of the operating system. That was for the PDP-11, which was serendipitous, because that was the computer that took over the
Ken_Thompson
File transfer utility
the PDP-6 architecture by Harrison "Dit" Morse early in the 1960s. It was subsequently implemented for DEC's operating systems for PDP-10, PDP-11, and
Peripheral Interchange Program
Peripheral_Interchange_Program
Filesystem of OpenVMS and RSX-11 operating systems
the directory of a reserved system account. While this was suitable for PDP-11 systems, which possessed limited permanent storage capacity, VAX systems
Files-11
Programming language used on DEC PDP-series machines
also ran on the PDP-5 and PDP-12. When ported to the PDP-11, the resulting FOCAL-11 relied on the underlying operating system, RT-11, to provide file
FOCAL_(programming_language)
1977 video game
developers Tim Anderson, Marc Blank, Bruce Daniels, and Dave Lebling for the PDP-10 mainframe computer. The original developers and others, as the company
Zork
Aspect of the instruction set architecture of CPUs
addressing mode is used: DEC PDP-11. Could have one or two autoincrement register operands. Some models, such as the PDP-11/45 and PDP-11/70, had a register that
Addressing_mode
Aspect of computing history
systems, mostly for the PDP-11 architecture. Microsoft's first operating system, MDOS/MIDAS, was designed along many of the PDP-11 features, but for microprocessor
History_of_operating_systems
American computer programmer
2000 problem. Stuart owned the first Digital Equipment Corporation (DEC) PDP-11 to enter California and often visited the Computer History Museum in Mountain
LaFarr_Stuart
Hardware that translates virtual addresses to physical addresses
contiguous space large enough for a segment available. Some models of the PDP-11 16-bit minicomputer have a segmented memory management unit with a set of
Memory_management_unit
are clones of DEC PDP-11 and VAX. SM-1 and SM-2 are clones of Hewlett-Packard minicomputers. The common operating systems for the PDP-11 clones are translated
SM_EVM
Device or software used for recording, editing and producing audio files
The Digital Editing System, as Soundstream called it, consisted of a DEC PDP-11/60 minicomputer running a custom software package called DAP (Digital Audio
Digital_audio_workstation
Microprocessor
The J-11 is a microprocessor chip set that implements the PDP-11 instruction set architecture (ISA) jointly developed by Digital Equipment Corporation
DEC_J-11
Processor with instructions capable of multi-step operations
been retroactively labeled CISC are System/360 through z/Architecture, the PDP-11 and VAX architectures, and many others. Well known microprocessors and microcontrollers
Complex instruction set computer
Complex_instruction_set_computer
1976 video game
is a text-based adventure game, released in 1976 by Will Crowther for the PDP-10 mainframe computer. It was expanded upon in 1977 by Don Woods. In the
Colossal_Cave_Adventure
Computer bus
was the earliest of several computer bus and backplane designs used with PDP-11 and early VAX systems manufactured by the Digital Equipment Corporation
Unibus
DEC high performance interface
controller design to handle multiple peripheral models, and allowed the PDP-10, PDP-11, and VAX computer families to share a common set of peripherals. At
Massbus
Software term
application[citation needed] for the DEC PDP-11 and VAX-11 minicomputers during roughly 1975–1985. Many of the PDP-11 and VAX-11 processors never ran DEC's operating
Killer_application
elected as a member of the PDP but switched to the LP during their term. This House member was elected as a member of the PDP but switched to the APGA during
List of members of the House of Representatives of Nigeria, 2019–2023
List_of_members_of_the_House_of_Representatives_of_Nigeria,_2019–2023
Symbol representing the word "and" (&)
one-dimensional arrays, not just strings.[citation needed] BASIC-PLUS on the DEC PDP-11 uses the ampersand as a short form of the verb PRINT.[citation needed] Applesoft
Ampersand
Product by Digital Equipment Corporation
was implemented to run on hardware from the PDP-8 and PDP-11 families. COS-310 was developed for the PDP-8 to provide an operating environment for DIBOL
Commercial_Operating_System
Multi-system emulator
Alpha PDP-1 PDP-4 PDP-7 PDP-8 PDP-9 PDP-10 PDP-11 PDP-15 VAX Family Systems MicroVAX I, VAXStation I MicroVAX II, VAXStation II MicroVAX 3900 VAX 11/730
SIMH
1976 book by John Lions
run on a PDP-11/40 with RK05 disk drive, LP11 line printer interface, PCL11 paper tape writer and KL11 terminal interface, or a suitable PDP-11 emulator
A Commentary on the UNIX Operating System
A_Commentary_on_the_UNIX_Operating_System
Internet chat system
the PDP-11 at the Milwaukee Public Schools (MPS) central office. After searching around the PDP-11 files and directories, Mark found the PDP-11 program
Talker
Procedural programming language
developed in the Soviet Union. It was implemented on the Agat computer, PDP-11 clones (Electronika, DVK, BK series), and Intel 8080 and Zilog Z80 clones
Rapira
Software that translates code from one programming language to another
Corporation (DEC) PDP-10 computer by W. A. Wulf's Carnegie Mellon University (CMU) research team. The CMU team went on to develop BLISS-11 compiler one year
Compiler
Data transfer channel connecting parts of a computer
Mini-Computers—The DEC PDP-11 (PDF). Spring Joint Computer Conference. pp. 657–675. Archived (PDF) from the original on 2011-11-27. Bray, Andrew C.; Dickens
Bus_(computing)
Information technology company in New Zealand
timesharing service in the early 1980s initially using DEC PDP 11/70s and then added DEC VAX 11/750s and PDP 11/84s. These systems were also used for Facilities
Datacom_Group
Early variant of Unix (1977) created by Bell Labs
that led to the -mm macros. While PWB users managed their source code on PDP-11 Unix systems, programs were often written to run on other operating systems
PWB/UNIX
American software company
office automation running on the PDP-11. IS/3 and IS/5 were enhanced versions of Unix System III and System V for PDP-11 and VAX. ISC Unix ports to the
Interactive Systems Corporation
Interactive_Systems_Corporation
Vector graphics terminal
1972 (selling for “under $11,000”). The DEC GT40 consists of: CPU: KD11-B (PDP-11/10) VT11 display processor, including bootstrap ROM (same modules as VT11
DEC_GT40
Computer architecture bit width
1965–70) include the IBM 1130, the HP 2100, the Data General Nova, and the DEC PDP-11. Early 16-bit microprocessors, often modeled on one of the mini platforms
16-bit_computing
Disk drive for Digital Equipment Corporation minicomputers
was also offered. Systems on which it can be used include DEC's PDP-8, PDP-11, and PDP-15. The RK05 was a moving head magnetic disk drive manufactured
RK05
Soviet micro-computer
raster graphics, text characters were used to form the blocks. M2 CPU: LSI-11 (PDP-11 LSI CPU implementation) clone Word length: 16 bits Address space: 32K
Elektronika_60
Programming language
a number of other systems including the popular DEC PDP-8, the Data General Nova and on DEC PDP-11 and the Artronix PC12 minicomputer. Word about MUMPS
MUMPS
Time-sharing operating system
to continue their research using smaller machines, first a PDP-7 and ultimately the PDP-11. Multics implements a single-level store for data access, discarding
Multics
American multinational company
and analyze data. The group sought to develop a GPIB interface for the PDP-11/04 minicomputer. In 1976, they founded a company in Truchard's garage. They
National_Instruments
Operating system
backwards. It has been ported to many hardware platforms, including the DEC PDP-11 and VAX systems, Motorola 68k (Sun-2 and Sun-3 workstations, AT&T UNIX PC
Xinu
1977 programming language implementation
could run on any of the then available microcomputers as well as campus DEC PDP-11 minicomputers. The operating system became known as UCSD p-System. There
UCSD_Pascal
Programmable text editor
the PDP-1 computer, the PDP-8 (under OS/8), the Incompatible Timesharing System (ITS) on the PDP-6 and PDP-10, and TOPS-10 and TOPS-20 on the PDP-10.
TECO_(text_editor)
Way for programs to access kernel services
used when the caller might be in Service Request Block (SRB) mode. The PDP-11 minicomputer used the EMT, TRAP and IOT instructions, which, similar to
System_call
American information technology company (1939–2015)
and DEC products PDP-11, VAX and Alpha for quite some time until the later years where support gradually dwindled. Both the DEC PDP-11 and VAX were discontinued
Hewlett-Packard
Programming language for the PDP-11
PL-11 is a high-level machine-oriented programming language for the PDP-11, developed by R.D. Russell of CERN in 1971. Written in Fortran IV, it is similar
PL-11
Fictional character
draw T-shirt artwork for O'Brien, who gave him some Polaroid snaps of a PDP-11 system running UNIX along with some notions about visual puns having to
BSD_Daemon
Unary operators that add or subtract one from their operand, respectively
the DEC PDP-11 on which C and Unix first became popular. This is historically impossible, since there was no PDP-11 when B was developed. The PDP-7, however
Increment and decrement operators
Increment_and_decrement_operators
Type of simple executable file
Research's CP/M (a microcomputer operating system modeled after TOPS-10 for the PDP-10), the type of files commonly associated with COM extension changed to
COM_file
Proprietary database management system
ISBN 978-1-4842-7499-6. Fitzjarrell, David (11 November 2013). "Compression and Advanced Compression in Oracle 11.2". Database Journal. Retrieved 7 July 2026
Oracle_Database
Software
operating system for the PDP-11/LSI-11 series of computers. It was developed by S&H Computer Systems, Inc. and is based on DEC's RT-11 single-user real-time
TSX-Plus
Numeric value with an unclear meaning
Unix source code.[citation needed] Unix was ported to one of the first DEC PDP-11/20s, which did not have memory protection. So early versions of Unix used
Magic_number_(programming)
1980 Soviet microprocessor family
Elektronika NC [ru] microarchitecture cores, but binary compatible with DEC's PDP-11 machines. First released in 1980, various models and variants of the series
1801_series_CPU
PDP 11
PDP 11
PDP 11
PDP 11
PDP 11
PDP 11
PDP 11
PDP 11
PDP 11