1 Basic Computer Systems. A computer is... A purely digital device Definition: Digital is a type of electronic signal that is processed, sent and.

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BasicComputer

Systems

A computer is . . .

A purely digital device Definition: Digital is a type of electronic

signal that is processed, sent and stored in bits—binary digits

Computers use binary coding—a coding system that uses two numbers--1 & 0

In computer terms, the bit is the smallest unit of measurement a computer can understand

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Bits to bytes . . .

8 bits equal 1 byte A byte is a single character of data, such

as a letter, number, etc.

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Term Abbreviation

Approximate Size

Kilobyte KB or K =1000 bytes (actual size is 1024 bytes)

Megabyte

MB =1 million bytes

Gigabyte

GB =1 billion bytes

Terabyte

TB =1 trillion bytes

A computer is device that . . .

Uses stored instructions (programs)

Accepts data that user supplies (input)

Manipulates data according to a program (processing)

Stores data (storage) Produces results (output)4

What types of data . . . ?

Text data – letters, numbers, and special characters

Graphic data – photographs, charts, and drawings

Audio data – voice and music Video data – moving pictures

and images5

Computer systems

The physical components of a computer system are called hardware.

Hardware typically includes: System unit, monitor, keyboard, mouse Peripheral devices (extra) such as a

printer or scanner

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Computer system vs. System unit

Computer system—the system unit along with input and output devices

System unit—the part of a computer system that processes data and stores information

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Embedded Smartphone Handheld Tablet Netbook Laptop

Desktop All-in-One

Server Mainframe Super Wearable

Computer systems

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Handheld

Smartphone

Netbook

Tablet

All-in-one

Supercomputer

Wearable

Server

Embedded Vehicle

Laptop

Mainframe

System unit

The main circuit board of a computer is the motherboard.

The central processing unit is located on the motherboard. The CPU is the circuitry that processes information—the “brain” of the computer.

The speed of the processor is controlled by the system clock.

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System clock

Controls the timing of ALL computer operations; measured in hertz—one cycle per second. Speed is measured in gigahertz (GHz)—a billion cycles per second. It takes about one-tenth of a second to blink

your eye; a computer can perform some operations 10 million times in the time it takes you to blink you eye.

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The most popular brand processors on the

market are AMD and Intel.

Main memory Main memory is located on

the motherboard. It is also known as primary memory: Random Access Memory (RAM)

Temporary memory available to the user; typically measured in gigabytes

Read Only Memory (ROM) Permanent memory that handles basic startup

functions, known as BIOS—basic input/output systems

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Input Devices:

Any hardware component that allows a user to enter information into a computer Keyboard

Pointing Devices

Scanners

Multimedia

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Keyboards

Solar Ergonomic-Split

Flexible

Blue-Tooth / iPad

Ergonomic-Split

Child’s Toddler Wireless

Gaming

Virtual

Virtual

LED-Color Changing

Pointing devices: Mouse

Trackball

Touch pad—typically found on laptops

Pen input—pen-like device touches surface of screen to digitally input data

Touch screen—touching the screen with your finger digitally inputs data

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Scanners Bar code reader—reads

universal product codes (UPC) Optical mark reader (OMR)—

reads “bubble” sheets marked with pencil

Optical character reader (OCR)-reads handwritten or typed text

Page scanner—digitally captures an image or text

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Multimedia

Microphone Electronic music keyboard Video camera Digital camera Virtual reality devices

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Output device

Any hardware component that can convey information to the user Display devices (soft copy: data projected

on a screen) Printers (hard copy: data printed on

paper) Speakers

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Display devices360°

Pico Projector HDTV

Flat-Screen MonitorProjector

Interactive Whiteboard

DocumentProjector

Printers

The two most common types of printersare ink-jet and laser

The speed of a printer is measured bythe number of pages per minute (PPM) that can be printed

The quality of a printer is measured bythe number of dots per inch (dpi) thatcan be printed

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Storage devices

The media on which data and information are kept

Three classifications: Magnetic—hard disk Optical—CD, DVD, Blu-ray

Information is burned on the disk by laser Flash—memory cards, flash drive

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Communication devices

Devices that make it possible for a user to communicate with another computer Most popular: modem

Phone, cable, DSL Computers on a network use

network interface cards (NIC) Wired or wireless

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Software

The instructions that allow the user to communicate with the computer; also called programs Three categories:

System software Application software Communications software

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System software Software responsible for the general

operation of a computer system, including the operation of hardware, running application software, and file management Operating system (OS)--system software that acts as a "go-

between", allowing computer hardware and other software to communicate with each other Microsoft Windows Mac OS Linux

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System software - utility

Utility—runs system checks and makes sure everything is working properly; One type of utility software is anti-virus

software, which checks for viruses (programs designed to disrupt or destroy the normal operation of a computer McAfee, Norton, Avast, AVG

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Word Processing Spreadsheet Presentation Database Painting/Drawing Accounting

Digital Imaging Desktop Publishing Web Design Gaming Video/Audio Production Podcasting

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Application softwarePrograms that allow the user to perform specific tasks:

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Communication software

Programs that make it possible for a computer to transmit and receive information to and from other computers. Web Browsers

Internet Explorer, Firefox, Safari, Google Chrome

Email Web-based (Yahoo, gmail, Live, etc.) Email clients (Outlook, Pegasus, Groupwise, etc.)

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KB MB GB TB CPU OS PPM

DPI RAM ROM UPC OMR OCR NIC

Abbreviations

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Mbps Hz GHz HDTV USB PC