PDP-11

E183936

computer architecture platform minicomputer series

The PDP-11 is a series of 16-bit minicomputers introduced by Digital Equipment Corporation in the 1970s that became highly influential in computer architecture and operating system development.

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All labels observed (14)

Label	Occurrences
PDP-11 canonical	9
DEC PDP-11	2
PDP-11/20	2
PDP-11/40	2
PDP-11/45	2
PDP-11/70	2
PDP-11 (at instruction-set level via compatibility mode)	1
PDP-11 family	1
PDP-11/34	1
PDP-11/44	1
PDP-11/73	1
PDP-11/83	1
PDP-11/84	1
PDP-11/94	1

Statements (68)

Predicate	Object
instanceOf	computer architecture platform ⓘ minicomputer series ⓘ
computerArchitectureType	16-bit architecture ⓘ
countryOfOrigin	United States of America ⓘ surface form: United States
familyMember	PDP-11 self-linksurface differs ⓘ surface form: PDP-11/20 PDP-11 self-linksurface differs ⓘ surface form: PDP-11/34 PDP-11 self-linksurface differs ⓘ surface form: PDP-11/40 PDP-11 self-linksurface differs ⓘ surface form: PDP-11/44 PDP-11 self-linksurface differs ⓘ surface form: PDP-11/45 PDP-11 self-linksurface differs ⓘ surface form: PDP-11/70 PDP-11 self-linksurface differs ⓘ surface form: PDP-11/73 PDP-11 self-linksurface differs ⓘ surface form: PDP-11/83 PDP-11 self-linksurface differs ⓘ surface form: PDP-11/84 PDP-11 self-linksurface differs ⓘ surface form: PDP-11/94
hasAddressSpace	16-bit address space ⓘ
hasBusArchitecture	Q-bus ⓘ Unibus ⓘ
hasInstructionSet	PDP-11 instruction set ⓘ
hasRegister	R0 ⓘ R1 ⓘ R2 ⓘ R3 ⓘ R4 ⓘ R5 ⓘ R6 (stack pointer) ⓘ R7 (program counter) ⓘ
hasRegisterCount	8 general-purpose registers ⓘ
influenced	BSD ⓘ surface form: BSD Unix C programming language implementation practices ⓘ Motorola 68000 family ⓘ surface form: Motorola 68000 architecture Unix operating system design ⓘ VAX ⓘ computer architecture education ⓘ
introducedInYear	1970 ⓘ
laterModelsSupport	memory management unit ⓘ separate instruction and data spaces ⓘ up to 4 MB of memory with segmentation ⓘ
manufacturer	Digital Equipment Corporation ⓘ
marketSegment	minicomputer market ⓘ
maxAddressableMemory	64 KB in basic models ⓘ
notableFor	influence on later minicomputers and microprocessors ⓘ orthogonal instruction set ⓘ simple and elegant architecture ⓘ widespread use in universities ⓘ
operatingSystem	BSD ⓘ surface form: 2.11BSD BSD ⓘ surface form: 2BSD RSTS/E ⓘ RSX-11 ⓘ RT-11 ⓘ Unix ⓘ surface form: UNIX V7 UNIX ⓘ
productionPeriod	1970s ⓘ 1980s ⓘ
successor	VAX ⓘ surface form: VAX-11
supports	autodecrement addressing ⓘ autoincrement addressing ⓘ byte addressing ⓘ general-purpose registers ⓘ memory-mapped I/O ⓘ
usedFor	industrial control ⓘ laboratory automation ⓘ real-time systems ⓘ scientific computing ⓘ time-sharing systems ⓘ
usedIn	Bell Labs for Unix development ⓘ academic computer science departments ⓘ industrial process control systems ⓘ
wordSize	16-bit ⓘ

Referenced by (27)

Full triples — surface form annotated when it differs from this entity's canonical label.

Unix → laterPlatform → PDP-11 ⓘ

UCSD p-System → platform → PDP-11 ⓘ

Digital Equipment Corporation → notableProduct → PDP-11 ⓘ

B → targetPlatform → PDP-11 ⓘ

this entity surface form: DEC PDP-11

B programming language → designedFor → PDP-11 ⓘ

this entity surface form: DEC PDP-11

VAX → compatibleWith → PDP-11 ⓘ

this entity surface form: PDP-11 (at instruction-set level via compatibility mode)

VAX → successorTo → PDP-11 ⓘ

this entity surface form: PDP-11 family

Xenix → supportedArchitecture → PDP-11 ⓘ