Introduction to Computer Systems

Section 1A

Objectives

List the four parts of a computer system

Identify four types of computer hardware

List four units of measure for computer memory

Provide two examples of input and output devices

Objectives (cont.)

Name and describe three types of storage devices

Differentiate the two main categories of computer software

List at least four specific types of application software.

Describe the five key categories of computers in use today

Computer

Electronic Device that processes data, converting it into information that is useful to people.

It is controlled by programmed instructions, which give the machine a purpose and tell it what to do

The Parts of a Computer System

Hardware

Software

Users

Data

Types of Computer Hardware

ProcessorMemory

Input and Output DevicesStorage

The Processor The processor is like the brain of the

computer Consist of one or more microprocessors Microprocessor is plugged in the

computer’s motherboard or circuit board

The computer’s processor is also referred to as the central processing unit (CPU)

Memory The most common type of memory is

called random access memory (RAM) RAM is volatile, so it needs a constant

supply of power.

Input and Output Devices Input Device – accepts data from user

Keyboard Mouse Scanners, digital cameras & microphone

Output Device – returned data to the user Monitor Printer Touch Screen Communication device

Communication devices – device that can perform input and output functions

Storage

The purpose of storage is to hold data permanently

Types of storage devices Tape drives Optical drives (CD & DVD) Removable hard drives Magnetic disks (most common)

Distinction between Memory and Storage There is more room in storage than in

memory Contents are retained in storage when

the computer is turned off, the data in memory disappears when you shut down the computer

Storage is very slow compared to memory, but it is much cheaper than memory

Self Check

A(n) __________ is an electronic device that processes data.

There is more room in storage than in ________ in a computer.

A device that holds a disk is called a(n) ____________.

Computer

memory

Disk drive

Types of Computer Systems

Supercomputers Mainframe computers Minicomputers Workstations Microcomputers or personal

computers

Importance of Computer Literacy

Increased Employability

Greater Earnings Potential

Greater Access to Resources

Greater Control of Assets

Please complete the following

Key Term QuizMultiple Choice

Review QuestionsPages 20-21