Chap. 1 & 2 - Overview, AppsChap. 1 & 2 - Overview, Apps
Jan SmithJan Smith
Computer Concepts Computer Concepts and Applicationsand Applications
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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 = 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
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