Chap. 1 & 2 - Overview, AppsChap. 1 & 2 - Overview, Apps

Jan SmithJan Smith

Computer Concepts Computer Concepts and Applicationsand Applications

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Covering:Covering:

• Review of chapter 1 - Overview

Chapter 1 - OverviewChapter 1 - Overview

A computer is an electronic device that:a. operates under the control

of memory unit

b. accepts data

c. processes data

d. produces output

e. stores the results for use later

b. accepts data

c. processes data

d. produces output

e. stores the results for use later

Chapter 1 - OverviewChapter 1 - Overview

Information Processing Cycle

Input

Processing

Output

Storage

Why is a computer powerful?Why is a computer powerful?

• Speed billions of actions per second

• Reliability failures usually human error

• Storage keeps huge amounts of data

Categories of ComputersCategories of Computers

• Personal or micro

• Mini

• Main Frame

• Super

Categories of ComputersCategories of Computers

Personal = microPortable Types: Hand-held Palmtop

NotebookSubnotebook Laptop Pen

Categories of ComputersCategories of Computers

Personal = microPortable Types: Hand-held Palmtop

NotebookSubnotebook Laptop Pen

Desktop

Categories of ComputersCategories of Computers

Personal = microPortable Types: Hand-held Palmtop

NotebookSubnotebook Laptop Pen

Desktop

Tower

Categories of ComputersCategories of Computers

Personal = microPortable Types: Hand-held Palmtop

NotebookSubnotebook Laptop Pen

Workstations

Desktop

Tower

Categories of ComputersCategories of Computers

Servers (how it’s used more than what it is)

Designed to support a computer network

More powerful

Larger memory

Larger storage capacity

High speed communications

Categories of ComputersCategories of Computers

Minicomputers

Originally for specific tasks, like engineering calculations

Main frameLarge systems for hundreds

of users

Requires special environment

Categories of ComputersCategories of Computers

SupercomputersMost powerful category

Used for weather forecasting, engineering design and testing, serious decryption

Cost several million dollars