Harvard Mark I computer

E412984

early computer electromechanical computer general-purpose computer

The Harvard Mark I computer was an early electromechanical, general-purpose computer built during World War II that pioneered the separation of data and instruction storage later known as the Harvard architecture.

Try in SPARQL Jump to: Surface forms Disambiguation Statements Elicitation Referenced by

All labels observed (4)

Label	Occurrences
Harvard Mark I computer canonical	2
IBM Automatic Sequence Controlled Calculator	2
Harvard Mark I	1
Harvard Mark II computer	1

How this entity was disambiguated

This entity first appeared as the object of triple T4093882 — 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: Harvard Mark I computer
Context triple: [Harvard architecture, historicallyAssociatedWith, Harvard Mark I computer]

A. UNIVAC I
UNIVAC I was one of the earliest commercial electronic computers, pioneering large-scale data processing for government and business in the early 1950s.
B. EDVAC
EDVAC was one of the earliest electronic stored-program computers, pioneering the use of binary arithmetic and influencing the development of modern computer architecture.
C. ENIAC project
The ENIAC project was an early U.S. military-funded effort during World War II to develop one of the first general-purpose electronic digital computers, laying foundational concepts for modern computing.
D. IBM 650
The IBM 650 was an early, widely used mid-1950s drum-based decimal computer that helped popularize electronic data processing in business and education.
E. Colossus computers
Colossus computers were pioneering British electronic computing machines built during World War II to help decrypt high-level German communications at Bletchley Park.
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: Harvard Mark I computer
Target entity description: The Harvard Mark I computer was an early electromechanical, general-purpose computer built during World War II that pioneered the separation of data and instruction storage later known as the Harvard architecture.

A. UNIVAC I
UNIVAC I was one of the earliest commercial electronic computers, pioneering large-scale data processing for government and business in the early 1950s.
B. EDVAC
EDVAC was one of the earliest electronic stored-program computers, pioneering the use of binary arithmetic and influencing the development of modern computer architecture.
C. ENIAC project
The ENIAC project was an early U.S. military-funded effort during World War II to develop one of the first general-purpose electronic digital computers, laying foundational concepts for modern computing.
D. IBM 650
The IBM 650 was an early, widely used mid-1950s drum-based decimal computer that helped popularize electronic data processing in business and education.
E. Colossus computers
Colossus computers were pioneering British electronic computing machines built during World War II to help decrypt high-level German communications at Bletchley Park.
F. None of above. chosen

Statements (51)

Predicate	Object
instanceOf	early computer ⓘ electromechanical computer ⓘ general-purpose computer ⓘ
alsoKnownAs	ASCC ⓘ Harvard Mark I computer ⓘ surface form: IBM Automatic Sequence Controlled Calculator
architecture	Harvard architecture ⓘ
clockSpeed	about 3 additions per second ⓘ
commissionedBy	United States Navy ⓘ
component	clutches ⓘ relays ⓘ rotary switches ⓘ vacuum tubes (limited use) ⓘ
countryOfOrigin	United States of America ⓘ surface form: United States
dateCompleted	1944 ⓘ
dateInaugurated	1944-08-07 ⓘ
depth	about 2 feet ⓘ
designer	Howard Aiken ⓘ surface form: Howard H. Aiken
developer	Harvard University ⓘ IBM ⓘ
exhibitedAt	Science Center (Harvard University) ⓘ surface form: Harvard Science Center (partial reconstruction)
feature	separate storage for data and instructions ⓘ
fundedBy	Harvard University ⓘ IBM ⓘ
height	about 8 feet ⓘ
historicalSignificance	one of the first large-scale automatic digital computers ⓘ pioneered separation of data and instruction storage ⓘ
influenced	Harvard Mark II ⓘ Harvard architecture concept ⓘ
inputMethod	punched cards ⓘ punched tape ⓘ
length	about 51 feet ⓘ
locatedIn	Cambridge, Massachusetts ⓘ Harvard University ⓘ
material	glass panels ⓘ steel frame ⓘ
notableUser	Grace Hopper ⓘ Howard Aiken ⓘ surface form: Howard H. Aiken
numericalSystem	decimal ⓘ
operatedBy	Harvard Computation Laboratory ⓘ
operation	automatic sequence control ⓘ
outputMethod	electric typewriters ⓘ punch card machines ⓘ
powerSource	electromechanical relays ⓘ
programmingMethod	paper tape control ⓘ plugboards ⓘ
purpose	ballistics calculations ⓘ military computations ⓘ scientific calculations ⓘ
usedDuring	World War II ⓘ
weight	about 5 tons ⓘ
wordLength	23 decimal digits ⓘ

How these facts were elicited

Referenced by (6)

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

Harvard architecture → historicallyAssociatedWith → Harvard Mark I computer ⓘ

Howard Aiken → notableWork → Harvard Mark I computer ⓘ

this entity surface form: Harvard Mark I

Howard Aiken → notableWork → Harvard Mark I computer ⓘ

this entity surface form: IBM Automatic Sequence Controlled Calculator

Howard Aiken → designed → Harvard Mark I computer ⓘ

this entity surface form: Harvard Mark II computer

Harvard Mark I computer → alsoKnownAs → Harvard Mark I computer ⓘ

subject surface form: Harvard Mark I