Bits and Bytes

Question 1

What is a byte?

Answer 1

It is a group of 8 bits that can be individually addressable.

Question 2

What is a bit?

Answer 2

Holds 0 or 1

Question 3

What is a word?

Answer 3

● It is a group of 4 bytes (32 bit architecture) or
● It is a group of 8 bytes (64 bit architectures)
● The address of a word is aligned to either 4 or 8 bytes respectively (multiple of 4 or 8 bytes).

Question 4

What is memory mapped I/O?

Answer 4

When device registers are mapped to
memory.

A bit can represent the state of the device.