Digital Data

Question 1

what is ASCII Code (7-bit)

Answer 1

original 7-bit ASCII code table used 7 bits to rep text and 128 character in table

Question 2

what is extended ASCII Code (8-bit)

Answer 2

8-bit table contains 256 characters and makes use of the 8th bit in a byte.

Question 3

What is unicode

Answer 3

Character encoding standard created to solve problem of limitations of ASCII.
Characters are called code points

Question 4

What is hexadecimal

Answer 4

numbering system uses the base 16.
hex values expressed as digits 0-9 and letters A-F giving sixteen possibilities

Question 5

How can you use hexadecimal

Answer 5

simplify long binary paterns

Question 6

How to convert binary pattern to hexadecimal

Answer 6

1. Split binary pattern into 4-bit groups
2. Establish denary value for each group
3. Convert from denary to hexadecimal

Question 7

What is One’s complement

Answer 7

can be used to represent a binary number; when using one’s complement, each bit is inverted, so a 1 bit changes to a 0 bit, and each 0 bit is changed to a 1 bit.

Question 8

What is two’s complement

Answer 8

method of representing signed numbers in a computer system.