Wednesday, July 13, 2011

Classification of Computer :ACCORDING TO SIZE

ACCORDING TO SIZE

The Columbia Supercomputer at NASA

IBM z-series computer is about 6 feet tall

HP 2100 mini-computer
According to size, traditionally computers are divided in four categories, namely,

a) Super Computer

  • Super computers are the fastest, most-powerful and most expensive computers.
  • It has the ability to recover automatically from failures.
  • It has the ability to support several Giga Bytes of RAM.
  • Unlike conventional computers, which have a single processor to process one instruction at a time, supercomputers have multiple processors (or CPUs) that process multiple instructions at a time.
  • Supercomputers are widely used in scientific applications such as aerodynamic design and simulation, processing of geological data.
  • One of the most powerful supercomputers today is "The Cray-2" and Some others are CRAY 1, CRAY - MP, SX-2, HITAC S-300, etc.

b) Mainframe Computer

  • A mainframe computer is usually slower, less powerful and less expensive than supercomputers.
  • Very large in size with approximately 1000 square ft area.
  • Mainframes process several million instructions per second (MIPS). More than 1,000 remote workstations can be accommodated by a typical mainframe computer.
  • Mainframes are used by banks and many businesses to update inventory, etc.
  • Many modern mainframes have multiprocessing capabilities.

c) Mini Computer

  • These are also a general purpose computer, smaller than mainframe computer. Medium sized computer, occupying approximately 10 sq ft of area.
  • They have slower operating speed, smaller backup storage, limited hardware and less memory than mainframes.
  • Minicomputers are well adapted for functions such as accounting, word processing, data base management, statistical packages for social sciences
  • More than 50 terminals and large storage capacity device than micro computers but smaller than mainframe computers. E.g. Prime 9755

d) Micro Computer

  • A microcomputer is the smallest, least expensive of all the computers.
  • Microcomputers have smallest memory and less power
  • Microcomputers are also called personal computers.
  • The most common type of microcomputer is a desktop computer, which is a non-portable personal computer.

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