Third Generation Computers: Mainframes

Atanasoff-Berry-Computer made

Nov 26, 1939

By Dr. John V. Atanasoff and his assistant Clifford Berry

first programmable computer designed

Sep 19, 1941

By Konrad Zuse

Rockefeller Differential Analyzer created

Aug 20, 1942

By Vannevar Bush

ENIAC was placed in operation at the Moore School.

Jul 29, 1944

Thirty separate units, plus power supply and forced-air cooling, weighed over thirty tons. Its 19,000 vacuum tubes, 1,500 relays, and hundreds of thousands of resistors, capacitors, and inductors consumed almost 200 kilowatts of electrical power.

Harvard Mark I first created.

Dec 30, 1944

Howard Aiken, in collaboration with engineers from IBM, constructed a large automatic digital sequence-controlled computer.

First Draft of a Report on the EDVAC

Apr 28, 1945

By John von Neumann. This report changed the direction of computer development away from punched paper tape.

Grace Hoper records first "bug" in Harvard Mark II

Sep 9, 1945

A moth stuck between the relays and logged at 15:45 hours.

First successfully tested point-contact transistor

Jul 17, 1947

By William Shockley, Walter Brattain, and John Bardeen

first Germanium transistor.

Dec 29, 1947

By Bell Labs physicists Shockley, Brattain, and Bardeen.

the Model 3 created.

Aug 4, 1948

By Remington engineers. It was a one of a kind concept computer.