Designed By:Saddam Hussain Soomro

1. Text Codes

2. Text Codes
• Computer programmers realized that they
need a commonly agreed standard code in
which numbers stood for alphabets, special
characters and digits.
• EBCDIC, ASCII and Unicode are three most
popular coding systems.

3. EBCDIC
• BCD (Binary Coded Decimal) system with six
bits represent maximum 64 symbols defined
by IBM was first system to represent symbols
with bits.
• Need to represent more characters led to
EBCDIC (Extended Binary Coded Decimal
Interchange Code) system with 8 bit and
represents 256 symbols.

4. ASCII
• The ANSI (American National Standard
Institute) represented ASCII (American
Standard Code for Information Interchange)
character set.
• It is most common today.
• The characters from 0 to 31 are control
characters, 32 to 64 special characters, 65 to
96 uppercase letters and few symbols, 97 to
127 lowercase letters and other symbols and
128 to 255 are other symbols.

5. Unicode
• An developing standard is Unicode
Worldwide Character Standard.
• It has two bytes 16 bits to represent each
symbol.
• It can represent 65536 symbols, which
include international symbols, and alphabets
from different languages in the world.

6. Unicode
• An developing standard is Unicode
Worldwide Character Standard.
• It has two bytes 16 bits to represent each
symbol.
• It can represent 65536 symbols, which
include international symbols, and alphabets
from different languages in the world.