Unformatted text preview: ically directing the flow of operations. The stored
program feature considerably influenced the development of modern digital computers
and because of this feature we often refer to modern digital computers as stored program
digital computers. The Electronic Discrete Variable Automatic Computer (EDVAC)
was designed on stored program concept. Von Neumann has also got a share of the credit
for introducing the idea of storing both instructions and data in the binary form (a system
that uses only two digits - 0 & 1 to represent all characters) instead of the decimal
numbers or human readable words.
The EDSAC (1947-49). Almost simultaneously with EDVAC of U.S.A., the
Britishers developed the Electronic Delay Storage Automatic Calculator (EDSAC). The
machine executed its first program in May 1949. In this machine, addition operation was
accomplished in 1500 microseconds, and multiplication operation in 4000 microseconds.
The machine was developed by a group of scientists headed by Professor Maurice
Wilkes at the Cambridge University Mathematical Laboratory.
Manchester Mark I (1948). This computer was a small experimental machine
based on the stored program concept. It was designed at Manchester University by a
group of scientists headed by Professor M. H. A. Newman. Its storage capacity was only
32 words, each of 31 binary digits. This was too limited to store data and instructions.
Hence, the Manchester Mark I was hardly of any practical use.
7. The UNIVAC I (1951). The Universal Automatic Computer (UNIVAC) was the
first digital computer, which was not "one of a kind". Many UNIVAC machines were
produced, the first of which was installed in the Census Bureau in 1951 and was used
continuously for 10 years. The first business use of a computer, a UNIVAC I, was by
General Electric Corporation in 1954.
In 1952, the International Business Machines (IBM) Corporation introduced the 701
commercial computer. In rapid succession, improved models of the UNIVAC I and other 700-series machines were introduced. In 1953, IBM produc...
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This document was uploaded on 04/07/2014.
- Spring '14