BTT1O

Unit 1 Review

The Computer System

4 parts Hardware Software Data User

Types of Hardware

Processor (CPU) manages all devices and performs the actual

processing of data Memory (RAM)

holds data and program instructions as the CPU works with them

Input and Output (I/O devices) Input: keyboard, mouse, microphone Output: monitor, speakers, printer

Storage devices Hard drive, optical drives

Software

Systems Software Application Software

Techniques for Using a Mouse Pointing Clicking Double Clicking Dragging Right Clicking

Alternative Input Devices

Scanner Bar Code Reader Microphone Webcam

Monitors

Cathode Ray Tube (CRT)

Flat Panel (LCD)

Printers

Impact Printers Dot Matrix

Non-Impact Printers Inkjet Laser

The Functions of a Computer

Input Storage Processing Output

The Four Tasks of a CPU

Fetch Gathering code for an instruction

Decode Interpreting the instruction to determine which functions are

to be performed Execute

Processing the instructions and sending them to their proper destinations

Store Sending the results of the instructions to the proper

memory location for retention

Storage Devices

Hard drive (40 -200 GB) Floppy Disk (1.44 MB) CD-R (700 MB) DVD-R (4.7 GB) Blu-Ray (25 GB) Flash Drive/USB Drive (256 MB – 10 GB)

Windows

Networks

Benefits Types

LAN WAN

Topography Linear Star

Security

Hackers vs. Crackers Passwords Firewalls Encryption Biometrics