PDP-4
E701309
The PDP-4 was an early 1960s 18-bit minicomputer from Digital Equipment Corporation that helped establish the PDP line in scientific and engineering computing.
All labels observed (1)
| Label | Occurrences |
|---|---|
| PDP-4 canonical | 6 |
How this entity was disambiguated
This entity first appeared as the object of triple T7894568 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: PDP-4 Context triple: [PDP-7, predecessor, PDP-4]
-
A.
PDP-7
The PDP-7 was a 1960s DEC minicomputer whose relatively low cost and flexible design made it popular in research labs and notable as the machine on which the first version of Unix was developed.
-
B.
PDP-6
The PDP-6 was a 36-bit mainframe computer developed by Digital Equipment Corporation in the 1960s, notable for its time-sharing capabilities and influence on later PDP-10 systems.
-
C.
PDP-8
The PDP-8 is a pioneering 12-bit minicomputer introduced in the 1960s that became widely known for its low cost, compact size, and major role in popularizing minicomputers in industry and education.
-
D.
PDP-11
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.
-
E.
PDP-10
The PDP-10 was a family of mainframe computers produced by Digital Equipment Corporation in the late 1960s and 1970s, widely used in research and time-sharing systems and influential in the development of early programming languages and operating systems.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: PDP-4 Target entity description: The PDP-4 was an early 1960s 18-bit minicomputer from Digital Equipment Corporation that helped establish the PDP line in scientific and engineering computing.
-
A.
PDP-7
The PDP-7 was a 1960s DEC minicomputer whose relatively low cost and flexible design made it popular in research labs and notable as the machine on which the first version of Unix was developed.
-
B.
PDP-6
The PDP-6 was a 36-bit mainframe computer developed by Digital Equipment Corporation in the 1960s, notable for its time-sharing capabilities and influence on later PDP-10 systems.
-
C.
PDP-8
The PDP-8 is a pioneering 12-bit minicomputer introduced in the 1960s that became widely known for its low cost, compact size, and major role in popularizing minicomputers in industry and education.
-
D.
PDP-11
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.
-
E.
PDP-10
The PDP-10 was a family of mainframe computers produced by Digital Equipment Corporation in the late 1960s and 1970s, widely used in research and time-sharing systems and influential in the development of early programming languages and operating systems.
- F. None of above. chosen
Statements (31)
| Predicate | Object |
|---|---|
| instanceOf |
PDP series computer
ⓘ
minicomputer ⓘ |
| architectureGeneration | second generation computer ⓘ |
| bitWidth | 18-bit ⓘ |
| category | early 1960s computer ⓘ |
| computerLine | PDP line ⓘ |
| countryOfOrigin |
United States
ⓘ
linked to:
United States of America
|
| cpuArchitecture | serial 18-bit architecture ⓘ |
| dataPathWidth | 18 bits ⓘ |
| designedBy | Digital Equipment Corporation engineers ⓘ |
| family | Programmed Data Processor ⓘ |
| instructionSetCompatibility | PDP-1 compatible (partial) ⓘ |
| intendedUse |
engineering computing
ⓘ
scientific computing ⓘ |
| introducedAroundYear | 1962 ⓘ |
| introducedInDecade | 1960s ⓘ |
| logicFamily | discrete transistor logic ⓘ |
| mainMemoryType | magnetic core memory ⓘ |
| manufacturer | Digital Equipment Corporation ⓘ |
| marketSegment |
engineering computing
ⓘ
scientific computing ⓘ |
| memoryTechnology | core memory ⓘ |
| notableFor |
helping establish the PDP line in engineering computing
ⓘ
helping establish the PDP line in scientific computing ⓘ |
| numberSystem | binary ⓘ |
| predecessor | PDP-1 ⓘ |
| successor | PDP-7 ⓘ |
| vendor | Digital Equipment Corporation ⓘ |
| wordAddressable | true ⓘ |
| wordLength | 18 bits ⓘ |
| wordType | binary fixed-point ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: PDP-4 Description of subject: The PDP-4 was an early 1960s 18-bit minicomputer from Digital Equipment Corporation that helped establish the PDP line in scientific and engineering computing.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.