Generally there are four types of Computer according to size, work & speed, They are as follows:
1. Super Computer:
A supercomputer is a computer with a high-level computational capacity. Performance of a supercomputer is measured in floating point operations per second (FLOPS). As of 2015, there are supercomputers which can perform up to quadrillions of FLOPS. Supercomputers were introduced in the 1960s, made initially, and for decades primarily, by Seymour Cray at Control Data Corporation (CDC), Cray Research and subsequent companies bearing his name or monogram. While the supercomputers of the 1970s used only a few processors, in the 1990s machines with thousands of processors began to appear and, by the end of the 20th century, massively parallel supercomputers with tens of thousands of "off-the-shelf" processors were the norm. Since its introduction in June 2013, China's Tianhe-2 supercomputer is currently the fastest in the world at 33.86 petaFLOPS (PFLOPS), or 33.86 quadrillions of FLOPS.2. Mainframe Computer:-
Mainframe computers are computers used primarily by large organizations for critical applications, bulk data processing such as census, industry and consumer statistics, enterprise resource planning and transaction processing. The term originally referred to the large cabinets called "main frames" that housed the central processing unit and main memory of early computers. Later, the term was used to distinguish high-end commercial machines from less powerful units. Most large- scale computer system architectures were established in the 1960s, but continue to evolve. Modern mainframe design is generally less defined by single-task computational speed (typically defined as MIPS rate or FLOPS in the case of floating point calculations), and more by:- Redundant internal engineering resulting in high reliability and security
- Extensive input-output facilities with the ability to offload to separate engines
- Strict backward compatibility with older software
- High hardware and computational utilizationrates through virtualization to support massive throughput.
Their high stability and reliability enables these machines to run uninterrupted for decades.
3. Mini Computer:-
A minicomputer, is a class of smaller computers that developed in the mid-1960s. In a 1970 survey, the New York Times suggested a consensus definition of a minicomputer as a machine costing less than 25,000 USD, with an input-output device such as a tele- printer and at least four thousand words of memory, that is capable of running programs in a higher level language, such as Fortran or BASIC. The class formed a distinct group with its own software architectures and operating systems. Minis were designed for control, instrumentation, human interaction, and communication switching as distinct from calculation and record keeping. During the two decade lifetime of the minicomputer class (1965-1985), almost 100 companies formed and only a half dozen remained. Some popular mini computers in current date are:-
- Samsung NC10 NC20 och,
- Acer Aspire One A150-B,
- MSI Wind U100,
- Asus Eee PC 901,
- HP Compaq Mini 730eo, etc.
4. Microcomputer:-
A microcomputer is a small, relatively inexpensive computer with a microprocessor as its central processing unit (CPU). It includes a microprocessor, memory, and input/output (I/O) facilities. Microcomputers became popular in the 1970s and 80s with the advent ofincreasingly powerful microprocessors. The predecessors to these computers, mainframes and minicomputers, were comparatively much larger and more expensive.
Some popular microcomputers are:-
- Intel SIM8-01,
- Motorola MEK6800D2,
- Rockwell AIM-65,
- Synertek SYM-1, &
- Intel SDK-85, etc
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