Ø DIGITAL
COMPUTER
Ø ANALOG COMPUTER
Ø HYBRID COMPUTER
DIGITAL COMPUTER:
The
digital computer work upon discontinuous data. They convert the data into
digits (i.e. 0 and 1) and all operations are carried out on these digits at
extremely fast rates. Digital Computers can further be classified into the
followings:
(1) Micro computers: These computers use a microprocessor chip and this chip is used instead of CPU means that this microprocessor chip works as a CPU. These computers are also called personal computers. Two major types of these computers are laptop or Desktop computers. Only one user uses these computers at time that's why they are also known as personal computers.
(2) Mini
Computers: Mini Computers, also known as mid range computers were first developed
as special purpose mainframe computer. These are powerful computer. These
computers come into existence in 1960s at that time mainframe computer was very
costly. Mini computers were available in cheap prices, so users start using it.
(3)
Workstations: Workstations are similar to personal computers but have greater
memory and more extensive mathematical abilities, and they are connected to
other workstations or personal computers to exchange data.
(4)
Mainframe Computer: It is a very powerful and large computer. It has more
memory, speed and capabilities than workstations and is usually shared by
multiple users through a series of interconnected computers.
(5)
Super Computers: Super Computers are the most powerful computers among all.
These consist of several processors running together there by making them
faster and powerful. These computers are capable of handling huge amounts of
calculations that are beyond human beings. Super Computers can perform billions
of instructions per second. Some of the today’s super computers have the
computing capability equal to that of 40,000 micro computers. (PARAM and ANURAG
are super computers produced by India and are exported to many European
countries.
ANALOG COMPUTER:
In analog computers, continuous data are used. Computations are
carried out with physical quantities such as voltage, length, current,
temperature etc. The devices that measure such quantities are analog devices,
e.g. voltmeter, ammeter. Analog computers operate by measuring rather than
counting.
HYBRID COMPUTER:
Hybrid computers utilize the best quantities of both that the digital
and analog computers. In these computers some calculations take place in analog
manner and rest of them take place in digital manner. This type of computers
are best used in hospitals where analog part is responsible for measurement of
patient’s heart beat, blood pressure, temperature and then the operation is
carried out in digital fashion.
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