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•A supercomputer is a computer that performs at or near the currently highest operational rate for computers.

•Used for scientific and engineering applications that must handle very large databases

•Supercomputers are really multiple computers that perform parallel processing

•Parallel processing approaches: symmetric multiprocessing (SMP) and massively parallel processing (MPP).

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•PDAs, also called handhelds or palmtops

•They use a form of touch screen technology, using a light pen or stylus as an input device rather than a keyboard

•Were used frequently as personal information managers (PIMs)

•PDAs can synchronize with microcomputers to transfer data

•integrated keyboard in Palmtops

•2MB of RAM and 2MB of ROM average

•Infrared port to exchange data between 2 PDAs (Beam)

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Microcomputer, an electronic device with a microprocessor as its central processing unit (CPU)

It is also known as pc

A microcomputer's CPU includes random access memory (RAM), read-only memory (ROM) memory, input/output (I/O) ports, interconnecting wires and a motherboard

Datapoint 2200 by Computer Terminal Corporation (CTC) is credited as the first microcomputer

Know simply referred as computers

Oversimplification = laptop and notebooks etc.

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A notebook or a laptop is a portable personal computer. Consisting of a thin LCD or LED computer screen that is mounted on the inside of the upper lid of a "clamshell" form and an alphanumeric keyboard on the inside of the lower side. To use the computer, the clamshell is opened up and folded shut for transportation, making them very mobile. Laptops are used for a variety of things, including work, in schools for education, playing games, internet surfing. A specialized model - rugged notebooks - are used in construction or for military applications.

The Epson HX-20 was the first laptop-sized computer invented by Suwa Seikosha's Yukio Yokozawa in 1980. It was the first computer described as a "laptop" and "notebook" in its patent. Since its invention, there have been various different types of notebooks have been invented such as convertible/hybrids, rugged notebooks, business laptops.

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                                      Minicomputers

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                                      Minicomputers

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A minicomputer is a smaller class of computers developed in the 1960s which were sold or much less than a mid-size IBM computer and mainframes. They are smaller than mainframe computers but bigger than a microcomputer. The term was first developed in the 60s when smaller computers became possible with the help of transistors and core memory technologies.

Minicomputers are designed to serve multiple users and process significant amounts of data.

The production of minicomputers declined in the mid80s-90s with the emergence of more powerful microprocessors and generic Intel-based PCs and Unix based servers.

IBM AS/400 is one of the few surviving proprietary minicomputer architectures that are still used.

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                                          Mainframe computer

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                                          Mainframe computer

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Mainframe computers are highly secure computer systems designed to run large workloads at user-defined service level objectives.(Ebbers et al., 2012) They are the data repository or hubs for a corporation's data processing center that are linked to users through devices such as workstations or terminals. In addition to storing data, being part of the data processing center mainframe computers are also responsible for the processing of data in bulk such as transaction processing, census or industry statistics.

They are built to be efficient in various tasks rather than be defined by a single-task computational speed. High reliability and security, along with backward compatibility and the ability to jettison to separate engines is a key feature in mainframe computers. Their high reliability and stability enable these machines to run for decades uninterrupted.

The most commonly used mainframe systems now are IBM mainframes and Unisys ClearPath Libra mainframes.