ITS (Incompatible Timesharing System)
E529383
ITS (Incompatible Timesharing System) was an influential early time-sharing operating system developed at MIT’s AI Lab, known for its hacker-friendly environment and role in the development of much of early AI and Lisp software.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Incompatible Timesharing System | 3 |
| ITS (Incompatible Timesharing System) canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5582302 — 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: ITS (Incompatible Timesharing System) Context triple: [Maclisp, platform, ITS (Incompatible Timesharing System)]
-
A.
Multics
Multics (Multiplexed Information and Computing Service) was an influential pioneering time-sharing operating system developed in the 1960s that introduced many concepts later adopted by modern operating systems, including Unix.
-
B.
TOPS-20
TOPS-20 is a mainframe time-sharing operating system from the 1970s and 1980s, known for its advanced interactive features and use on DEC’s PDP-10 systems.
-
C.
RSX-11
RSX-11 is a family of real-time, multi-user operating systems for PDP-11 minicomputers, widely used in industrial and embedded applications in the 1970s and 1980s.
-
D.
TOPS-10
TOPS-10 is a historic time-sharing operating system for DEC's PDP-10 mainframe computers, widely used in the 1960s and 1970s in academic and research environments.
-
E.
TENEX operating system
TENEX operating system is an early time-sharing operating system for the PDP-10 that introduced advanced virtual memory and interactive computing features influential in later 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: ITS (Incompatible Timesharing System) Target entity description: ITS (Incompatible Timesharing System) was an influential early time-sharing operating system developed at MIT’s AI Lab, known for its hacker-friendly environment and role in the development of much of early AI and Lisp software.
-
A.
Multics
Multics (Multiplexed Information and Computing Service) was an influential pioneering time-sharing operating system developed in the 1960s that introduced many concepts later adopted by modern operating systems, including Unix.
-
B.
TOPS-20
TOPS-20 is a mainframe time-sharing operating system from the 1970s and 1980s, known for its advanced interactive features and use on DEC’s PDP-10 systems.
-
C.
RSX-11
RSX-11 is a family of real-time, multi-user operating systems for PDP-11 minicomputers, widely used in industrial and embedded applications in the 1970s and 1980s.
-
D.
TOPS-10
TOPS-10 is a historic time-sharing operating system for DEC's PDP-10 mainframe computers, widely used in the 1960s and 1970s in academic and research environments.
-
E.
TENEX operating system
TENEX operating system is an early time-sharing operating system for the PDP-10 that introduced advanced virtual memory and interactive computing features influential in later systems.
- F. None of above. chosen
Statements (60)
| Predicate | Object |
|---|---|
| instanceOf |
operating system
ⓘ
research operating system ⓘ time-sharing operating system ⓘ |
| abbreviation | ITS ⓘ |
| basedOn |
DEC PDP-10 architecture
ⓘ
DEC PDP-6 architecture ⓘ |
| contemporaneousWith |
Multics
ⓘ
TENEX ⓘ
linked to:
TENEX operating system
TOPS-10 ⓘ |
| countryOfOrigin |
United States
ⓘ
linked to:
United States of America
|
| culturalRole |
central platform for early hacker community at MIT
ⓘ
incubator for free software ideas ⓘ |
| designedFor |
PDP-10
ⓘ
PDP-6 ⓘ |
| developer |
MIT Artificial Intelligence Laboratory
ⓘ
Massachusetts Institute of Technology ⓘ |
| endOfSupport | early 1990s ⓘ |
| feature |
extensive debugging facilities
ⓘ
job control and process inspection ⓘ networked file access between ITS machines ⓘ real-time multi-user time-sharing ⓘ terminal-based user interface ⓘ |
| fullName |
Incompatible Timesharing System
ⓘ
linked to:
ITS (Incompatible Timesharing System)
|
| historicalPeriod | mainframe era ⓘ |
| historicalSignificance | major influence on design of interactive computing environments ⓘ |
| hostedSystem |
Maclisp-based AI programs
ⓘ
early interactive fiction games ⓘ early versions of Emacs ⓘ |
| inception |
1967
ⓘ
late 1960s ⓘ |
| influenced |
Emacs text editor
ⓘ
linked to:
Emacs family of editors
GNU project culture ⓘ Lisp Machine operating systems ⓘ Zork (early versions) ⓘ
linked to:
Zork
hacker ethic ⓘ |
| license | non-commercial research use ⓘ |
| notableFor |
hacker-friendly environment
ⓘ
influence on Emacs development ⓘ influence on Lisp software development ⓘ influence on early AI research ⓘ influence on early networked computing ⓘ influence on hacker culture ⓘ open, non-password security model ⓘ support for interactive debugging ⓘ support for multiple terminals and users ⓘ support for real-time interaction with running programs ⓘ |
| primaryLocation |
MIT AI Lab
ⓘ
MIT Building 26 ⓘ |
| programmingLanguage |
Fortran
ⓘ
Lisp ⓘ
linked to:
Lisp programming language
MACLISP ⓘ
linked to:
Maclisp
MIDAS assembler ⓘ assembly language ⓘ |
| securityModel |
minimal access control
ⓘ
no passwords by default ⓘ |
| usedFor |
Lisp program development
ⓘ
artificial intelligence research ⓘ computer graphics experiments ⓘ early computer games ⓘ interactive program development ⓘ |
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: ITS (Incompatible Timesharing System) Description of subject: ITS (Incompatible Timesharing System) was an influential early time-sharing operating system developed at MIT’s AI Lab, known for its hacker-friendly environment and role in the development of much of early AI and Lisp software.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: ITS (Incompatible Timesharing System)
linked to: ITS (Incompatible Timesharing System)
linked to: ITS (Incompatible Timesharing System)