About computer system in details
Answers
Explanation:
COMPUTER SYSTEM
Definition: Is a collection of entities(hardware,software and liveware) that are designed to receive, process, manage and present information in a meaningful format.
COMPONENTS OF COMPUTER SYSTEM
Computer hardware - Are physical parts/ intangible parts of a computer. eg Input devices, output devices, central processing unit and storage devices
Computer software - also known as programs or applications. They are classified into two classes namely - sytem software and application software
Liveware - is the computer user. Also kwon as orgwareor the humanware. The user commands the computer system to execute on instructions.
a) COMPUTER HARDWARE
Hardware refers to the physical, tangible computer equipment and devices, which provide support for major functions such as input, processing (internal storage, computation and control), output, secondary storage (for data and programs), and communication.
HARDWARE CATEGORIES (Functional Parts)
A computer system is a set of integrated devices that input, output, process, and store data and information. Computer systems are currently built around at least one digital processing device. There are five main hardware components in a computer system: Input, Processing, Storage, Output and Communication devices.
INPUT DEVICES
Are devices used for entering data or instructions to the central processing unit. Are classifie according to the method they use to enter data.
a) KEYING DEVICES
Are devices used to enter data into the computer using a set of Keys eg Keyboard, key-to- storage and keypad.
i
B. POINTING DEVICES
Are devices that enter data and instructions into the computer using a pointer that appears on the screen. The items to be entered are selected by either pointing to or clicking on them.e.g mice, joystick, touch sensitive screen, trackballs
C) SCANNING DEVICES
Are devices that capture an object or a document directly from the source. They are classifie according to the technology used to capture data e.g. Scanners and Document readers.
i) Scanners
Used to capture a source document and converts it into an electronic form.
Example are - FlatBed and HandHeld scanners.
Related image
Image result for type of scanners
ii) Document readers
Are documents that reads data directly from source document and convey them as input in the form of electronic signal. e
Types of Document Readers
i) Optical Mar Reader (OMR)Image result for optical mark reader
ii) Barcode readers
Related image
iii) Optical Character ReadersImage result for optical character reader
b) Magnetic Readers
Reads data using magnetic ink.t uses principle of magnetism to sense data which have been written using magnetised ink.
THE CENTRAL PROCESSING UNIT ( C P U)
Is the brain or the heart of a computer. Is also known as processor and consist of three units namely -
i) Control Unit ( C U)
ii) Arithmetic logic Unit ( A L U)
iii) Main Memory unit ( M M U)
TYPES OF PROCESSORS
I) Comples Instruction Set Computers (CISC)
ii) Reduced Instruction Set Computers (RISC)
FUNCTIONS OF CENTRAL PROCESSING UNIT
- Process data
- Control sequence of operaions within the computers
- It gives command to all parts of a computer
- It control the use of the main memory in storing of data and instructions
- it provides temporary storage (RAM) and permanent storage(ROM) of data
THE CONTROL UNIT
Is the center of operations for the computer system, it directs the activities of the computer system.
Funlctions of Control Unit