Classification of Computers

Classification of Computers

• Super Computers
• Mainframe Computers.
• Minicomputers.
• Microcomputers.
• Special Purpose Computers.
• Lap tops
• Palm tops
• Work Stations
• Servers


Comparison of Computers
Computers have become
• Faster (more powerful and more memory),
• Cheaper (cost less) and
• Smaller in size
Supercomputers
• Sophisticated, expensive computers, Provide processing speeds, many times that of powerful workstations.
• Particularly used in the simulation and modeling of complex systems.
e.g. weather, chemical processes, the US economy, motion of galaxy

Mainframe Computers
• A multi-user computer designed to meet the computing needs of a large organization.
• Originally the term referred to the metal cabinet housing the CPU.
• Generally refers to computers of the 1950s and 1960s.
• Can process a number of applications concurrently.
• Used by large organisations to handle millions of transactions.
• Usually housed in specially wired air-conditioned rooms.


Minicomputers
• Scaled down mainframe. (refrigerator-size)
• Designed to meet the computing needs of a department or small company. Typically 4-100 users.
Can support a number of concurrent applications.

Microcomputers
• Appeared mid-to-late 70s.
E.g. Apple II, Sinclair Spectrum, Commodore PET
• Portable models now available
• Small computers that can fit on a desktop or briefcase.
• There are two types
• Personal Computers (PC)
• Workstations

Personal Computer (PC)
• Desktop or portable (laptop, notebook, palmtop).
• Used in most organisations and at homes.
• Commonly used for easy-to-use programs such as word processing, spreadsheets.
Workstations
• Connected to large computer system.
• Designed to work with large or complex applications.
.e.g. drafting, engineering design, 3D-graphical models