Computer System - composed of Software, Hardware and Firmware. It is a complete working computer.
Logical Components:
a. Input unit – the part of the computer system receiving data. It obtains information from input devices and places this information at the disposal of the other units for processing.
b. Output Unit - the part of the computer system releasing data. It takes information that the computer has processed and places it on various output devices to make the information available for use outside the computer.
c. Memory unit - the part of the computer system storing data. It stores computer programs while they are being executed. It retains information that has been entered through the input unit, so that it will be immediately available for processing when needed. The memory unit also retains processed information until it can be placed on output devices by the output unit.
d. Arithmetic and logic unit (ALU) – the part of the computer system manufacturing data. It is responsible for performing calculations, such as addition, subtraction, multiplication and division.
e. Central processing unit (CPU) - the part of the computer system controlling it. It coordinates and supervises the other sections’ operations.
f. Secondary storage unit - another part of the computer system storing data.
Physical Parts:
a. System Unit – contains the main components of the computer, such as the motherboard, CPU, RAM, video card, hard disk, disk drives, and the power supply. It can also contain optional components such as a sound card or a network card.
b. Input Devices - used to give data to the computer. The most common input devices are the keyboard and the mouse.
c. Output Devices - the components where the computer shows the results. A monitor, printer, plotter, and loud speaker are all output devices.
d. Storage Device - are used to store data permanently. A hard disk, floppy disk, CD-ROM, DVD-ROM and tape cartridge are examples of storage devices.
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