a) Mark – I (IBM ASCC): The Automatic Sequence Controlled Calculator (Harvard Mark - I) was the first operating machine that could execute long computations automatically. It was an electro-mechanical computer built at IBM by Harvard engineer Howard H. Aiken and other three engineers.
- It was 51 ft long, 8 ft height and 3 ft wide.
- 18,000 vacuum tubes were used.
- It consists of 7 lakhs 50 thousand parts.
- Cable connections were nearly 500 miles long.
It was the largest electro-mechanical calculator.
b) ENIAC: ENIAC (Electronic Numerical Integrator and Computer) was the first general purpose electronic computer. It was designed and built by John Mauchly, an American physicist and John Presper Eckert, an American Engineer at University of Pennsylvania, USA in 1946.
- It weighed more than 27,000 kg.
- It contained 18,000 vacuum tubes and 70,000 resistors.
- It consumed 150 Kw of power.
- Input was possible from an IBM card reader, and an output was possible from IBM card punch i.e. punch card were used as input and output devices.
EDVAC: EDVAC (Electronic Discrete Variable Automatic Computer) is the successor of the ENIAC made by the same designers John Mauchly and John P.Eckert in 1950 at Pennsylvania University, USA. It was the first stored program computer ever designed. It used approximately 4000 vacuum tubes and some internal storage.
No comments:
Post a Comment