2.6 Characters

Question 1

ASCII code

Answer 1

text and characters are represented by the ASCII code (american standard code for information interchange)

it has 7 bits so 2[7] = 128 code sequences

characters, numbers and control actions (such as SPACE and SHIFT)

Question 2

character set

Answer 2

list of binary codes that can be recognised by the computer hardware and software

Question 3

ASCII code groups

Answer 3

0-32 control codes

rest is symbols, digits and characters

Question 4

Extended ASCII code

Answer 4

uses 8 bits, so 2[8] = 256 code sequences

includes mathematical symbols

not been standardised in the same way the 7 bit code has
different manufacturers use different codes for different characters so data cannot be transferred across platforms easily

not enough codes to represent the different langages

Question 5

Unicode

Answer 5

universal standard recognised and used by the major hardware and software manufacturers

can represent text in all known human languages

up to 32 bits to represent over 1 or 16 million characters

first 128 characters correspond to ASCII