Computers Characteristics
Speed: A
computer computes problems much faster than a human being.
Accuracy: With the high computation speed, computers are able to produce
accurate results. If the input is valid, only then correct output will be
produced as computers follows GIGO i.e. Garbage In Garbage Out principle.
Generations
of Computers
The first electronic computer was designed and built at the
University of Pennsylvania based on vacuum tube technology.
Computers have been divided into five generations according to the
development of technologies used to fabricate the processors, memories and I/O
units.
❖ I Generation (1945 – 55) vacuum based and costly, used assembly
language which was translated to machine level language for execution. These
computers were used mainly for scientific calculations. Examples: ENIAC,
EDSAC, EDVAC, UNIVAC.
v II Generation (1955 – 65) Smaller than vacuum based computers, but better
performance-wise, used transistors instead of vacuum tubes. High level
languages such as FORTRAN and COBOL were used. Punched cards continued to be
used during this period. Computers, then, were used increasingly in business,
industry and commercial organizations. Examples: IBM 7030, Honeywell
400.
❖ IV Generation (1975 – 89) Microprocessors were introduced where complete
processors and large section of main memory could be implemented in a single
chip. CRT screen, laser & ink jet printers, scanners etc. were developed
and so were LAN and WANS. C and UNIX were used. Examples: Intel’s
8088,80286,80386,80486 .., Motorola’s 68000, 68030, 68040, Apple II, CRAY
I/2/X/MP etc.
No comments:
Post a Comment