COSMAC ELF computer
E80434
The COSMAC ELF computer is a simple, low-cost, build-it-yourself microcomputer from the late 1970s that became popular among hobbyists for learning and experimenting with early personal computing.
All labels observed (5)
| Label | Occurrences |
|---|---|
| COSMAC ELF | 1 |
| COSMAC ELF computer canonical | 1 |
| Netronics ELF II | 1 |
| Popular Electronics COSMAC ELF design | 1 |
| RCA COSMAC ELF computer design | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T634482 — 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: COSMAC ELF computer Context triple: [RCA 1802 microprocessor, usedIn, COSMAC ELF computer]
-
A.
RCA 1802 microprocessor
The RCA 1802 microprocessor is an early CMOS-based 8-bit CPU notable for its low power consumption, radiation hardness, and use in spacecraft and embedded systems in the 1970s and 1980s.
-
B.
Honeywell DDP-516 minicomputer
The Honeywell DDP-516 minicomputer was a rugged, 16-bit computer from the 1960s widely used in real-time and military applications, notably serving as the hardware platform for the original ARPANET Interface Message Processors.
-
C.
Intel 4004
The Intel 4004 is the first commercially available microprocessor, a 4-bit CPU introduced in 1971 that launched the microprocessor revolution.
-
D.
CP/M-86
CP/M-86 is a 16-bit version of the CP/M operating system designed for Intel 8086/8088-based computers, serving as an early alternative to MS-DOS on machines like the IBM PC.
-
E.
Commodore Amiga 1000
The Commodore Amiga 1000 is the first model in Commodore's Amiga line of personal computers, notable for its advanced multimedia capabilities, multitasking operating system, and pioneering graphics and sound for a mid-1980s home computer.
- 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: COSMAC ELF computer Target entity description: The COSMAC ELF computer is a simple, low-cost, build-it-yourself microcomputer from the late 1970s that became popular among hobbyists for learning and experimenting with early personal computing.
-
A.
RCA 1802 microprocessor
The RCA 1802 microprocessor is an early CMOS-based 8-bit CPU notable for its low power consumption, radiation hardness, and use in spacecraft and embedded systems in the 1970s and 1980s.
-
B.
Honeywell DDP-516 minicomputer
The Honeywell DDP-516 minicomputer was a rugged, 16-bit computer from the 1960s widely used in real-time and military applications, notably serving as the hardware platform for the original ARPANET Interface Message Processors.
-
C.
Intel 4004
The Intel 4004 is the first commercially available microprocessor, a 4-bit CPU introduced in 1971 that launched the microprocessor revolution.
-
D.
CP/M-86
CP/M-86 is a 16-bit version of the CP/M operating system designed for Intel 8086/8088-based computers, serving as an early alternative to MS-DOS on machines like the IBM PC.
-
E.
Commodore Amiga 1000
The Commodore Amiga 1000 is the first model in Commodore's Amiga line of personal computers, notable for its advanced multimedia capabilities, multitasking operating system, and pioneering graphics and sound for a mid-1980s home computer.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
hobbyist computer
ⓘ
homebrew microcomputer ⓘ single-board computer ⓘ |
| architecture |
COSMAC 1802 architecture
ⓘ
linked to:
RCA 1802 microprocessor
|
| basedOn | RCA 1802 microprocessor ⓘ |
| category |
early personal computer
ⓘ
microcomputer kit ⓘ |
| clockSpeed | 1.76 MHz ⓘ |
| costCharacteristic | low-cost ⓘ |
| countryOfOrigin |
United States
ⓘ
linked to:
United States of America
|
| cpu |
RCA CDP1802
ⓘ
linked to:
RCA 1802 microprocessor
|
| creator |
Joseph Weisbecker
ⓘ
RCA engineers ⓘ
linked to:
RCA
|
| designedFor |
electronics hobbyists
ⓘ
homebrew computer builders ⓘ |
| documentationLanguage | English ⓘ |
| expandableTo | several kilobytes of RAM ⓘ |
| expansionCapability |
cassette interface add-ons
ⓘ
keypad input add-ons ⓘ video display add-ons ⓘ |
| featuredIn | Popular Electronics magazine ⓘ |
| firstDescribedIn |
Popular Electronics August 1976 issue
ⓘ
linked to:
Electronics magazine
Popular Electronics September 1976 issue ⓘ
linked to:
Popular Electronics magazine
|
| historicalSignificance |
popularized low-cost microcomputing for hobbyists
ⓘ
served as an entry point into microprocessor programming in the 1970s ⓘ |
| initialMemorySize | 256 bytes ⓘ |
| inputMethod |
front-panel switches
ⓘ
toggle switches ⓘ |
| inspired |
Netronics ELF II
ⓘ
linked to:
COSMAC ELF computer
Quest Super ELF ⓘ later RCA 1802-based hobby computers ⓘ |
| introducedIn | 1976 ⓘ |
| introducedInDecade | 1970s ⓘ |
| manufacturer | homebuilt from magazine plans ⓘ |
| marketedAs | build-it-yourself computer ⓘ |
| memoryType | static RAM ⓘ |
| notableFeature |
could be built on perfboard
ⓘ
no dedicated ROM required ⓘ static CMOS CPU allowing low power ⓘ very simple hardware design ⓘ |
| outputMethod |
LED display
ⓘ
hexadecimal display ⓘ |
| powerSource |
9-volt battery
ⓘ
DC power supply ⓘ |
| primaryUse |
educational computing
ⓘ
experimenting with machine language ⓘ learning microcomputers ⓘ |
| programEntryMethod | front-panel switch toggling ⓘ |
| wordSize | 8-bit ⓘ |
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: COSMAC ELF computer Description of subject: The COSMAC ELF computer is a simple, low-cost, build-it-yourself microcomputer from the late 1970s that became popular among hobbyists for learning and experimenting with early personal computing.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject linked to:
COSMAC ELF computer
linked to: COSMAC ELF computer
linked to: COSMAC ELF computer
linked to: COSMAC ELF computer
linked to: COSMAC ELF computer