ITGS Entry 2 -Chapter 2 (Tomorrow's Technology and You 8/e)

Bits as Numbers

    Binary number system   

• binary denotes all the numbers with combination of two digits
• decimal numbers are automatically converted into binary numbers and vice versa
• binary number processing is completely hidden from the user

decimal representation- binary representation
0-0
1-1
2-10
3-11
4-100
5-101
6-110
7-111
8-1000
9-1001
10-1010
11-1011
12-1100
13-1101
14-1110
15-1111

Bits as Codes

ASCII

the most wideley used code
an abbreviation of American Standard code for Information Interchange

Unicode

A coding scheme that supports 65,000 unique characters

Bits as Instructions in Programs
-->Programs are stored as collections of bits
Program instructions are represented in binary notation through the use of codes

Bits, Bytes, and Buyzzwords
byte=8 bits
kilobyte= 1 thousand bytes
megabytes= 1 million bytes
gigabytes= 1 billion bytes
terabytes= 1 trillion bytes

Green Computing

The manufacture of hardware and software can have an impact on the environment.
-- buy green equipment (energy star)
--Use a network and solar battery
-- turn off the computer when you're away
--screen savers don't save energy
--print only once
 --recycle waste products