SYSTEMS SOFTWARE. SYSTEMS SOFTWARE is a set of programs, which is developed & installed in a computer system for the purpose of developing other programs, and to enhance the functional capabilities of the computer system….
CLASSIFICATION OF OPERATING SYSTEMS. The OS determines determine the type of processing that a computer system is able to perform, since it controls the allocation & use of the computer resources. Operating systems can be…
• An Operating system is a set of programs that is used to manage the basic hardware resources of a computer.
• This is the main program that controls the execution of user applications, and enables the user to access the hardware & software resources of the computer.
When the computer is switched on, the OS programs run & check to ensure that all parts of the computer are functioning properly.
Printers are output devices that facilitates the transfer of information from a computer to a paper. It is used when a permanent record of the output may be needed on paper.
Printed output is usually referred to as Hardcopy output, which means that the document can be kept indefinitely for future reference or use. The printed output can be distributed conveniently to reach the recipients of such information/results.
CENTRAL PROCESSING UNIT (CPU) / PROCESSOR.
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The CPU is described as the computer’s ‘brain’ that monitors all the computer operations. It is the unit inside the computer where all software instructions, math and logic operations are carried out.
In Microcomputers, the CPU is implemented in a single silicon device called a Microprocessor (Computer chip), which is made by combining a very large no. of transistors together using a technology referred to as Very Large Scale Integration (VLSI).
The PROCESS OF STARTING-UP (BOOTING) A COMPUTER.
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STARTING-UP (BOOTING) A COMPUTER. Before switching on a computer, make sure that all the components are properly connected, and that the computer is connected to an active power source. Turn on the switch at the…
Supermarkets. Supermarkets and other retail stores use computers for stock control, i.e., to help them manage their daily activities.
The stock control system keeps record of what is in store, what has been sold, and what is out of stock. The Management is automatically alerted when a particular item or items are running out of stock and need to be reordered
ADVANTAGES and DISADVANTAGES OF USING COMPUTERS.
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ADVANTAGES and DISADVANTAGES OF USING COMPUTERS.
Computers have many advantages over other types of office and business equipment that are used for data processing functions. Some of the advantages are:
CLASSIFICATION ACCORDING TO PHYSICAL SIZE.
Computers can be classified into 5 main groups according to their size as:
Supercomputers.
Mainframe computers.
Minicomputers.
Microcomputers.
Portable computers (Laptops, Notebooks & Palmtops).
Type of processor (Central processing unit – CPU)
Microcomputers use microprocessors, which are manufactured on a single chip, as their CPU.
In larger computers such as supercomputers, mainframe & minicomputers, the processing is carried out by a number of separate, high-speed components instead of a single processor.
