4 - Data Codes Flashcards
1
Q
Why use hexadecimal notation?
A
- Convenient shorthand for binary numbers
- Every hexadecimal digit exactly represents 4 binary bits
Most importantly, memory locations (1 byte, 8 bits) can be described in 2 hex digits, instead of 8 binary digits !
2
Q
1001 1110 (Base 2) in Hexadecimal?
A
9E_16
3
Q
AA3E in binary?
A
1010 1010 0011 1110
4
Q
What is a ‘bit’ in the physics sense?
A
A high or low state of voltage in the CPU.
Higher value of volt is 1 and lower value is 0.
The specific values are different in various logic families and components.
5
Q
How many bits are used in ASCII, EBCDIC and Unicode?
A
ASCII is 7, EBCDIC 8 and Unicode can be 8, 16 or 32.
6
Q
How would you go from decimal to Hexadecimal ?
A
Divide by 16.
