Hence, in a common computer, there is
(a) An input device i.e., a key board
(b) A Central Processing unit (CPU) i.e., a buffet and
(c) An output device i.e., a monitor or a ocular Display Unit (VDU)
(a) Input Devices
The most commonly utilise input device is a key board. It is just desire a type-writer keyboard. Other types of input devices be Bar-Code Recognition, Hard-Held Terminal, and Hard crisscross Terminal or also called data tablet, Optical hold immortalizeing, Magnetic Ink tone Recognition (MICR), Optical Character interpreter (OCR) etc.
(b) Central Processing Unit (CPU)
It has a box like appearance and is considered as the heart of the computer. It is consisted of;
(i) look into Unit (CU)
(ii) arithmetic and Logic Unit (ALU) and
(iii) Primary Storage Unit, (i) Control Unit (CU)
The control Unit organizes all the trading operations. It selects, interprets and executes the programme instructions, (ii) Arithmetic and Logic Unit (ALU)
It does all the arithmetic and logic operations i.e., adding, subtracting, multiplying, dividing and comparing, (iii) Primary Storage Unit
It is the memory section of CPU that stores data and programmes that are waiting to be processed or before long being processed.
Generally two different types of memory are used in the computers; i.e.
(1) Random Access Memory (RAM), and
(2) Read Only Memory (ROM)
RAM:
It allows read/write only when is volatile i.e., loses Memory when power is cut.
ROM:
It is non-volatile and is put in by the manufacturer. It is commonly used not storing of programme instructions that are not subject to change. There are various ROM chips to meet users specifications; like
PROM architectural plan Read Only Memory
EPROM Erasable Programme Read Only Memory
EEROM Electrically Erasable Read Only Memory
alone the informations within the computer is stored in the form a binary SYSTEM i.e.. Os and 1s.
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