1. What are the functional parts of 8086 CPU?

The two independent functional parts of the 8086 CPU are:

i. Bus Interface Unit (BIU):

BIU sends out addresses, fetches instruction from memory, reads data from ports and

memory and writes data to ports and memory.

ii. Execution Unit (EU):

EU tells the BIU where to fetch instructions or data, decodes instructions and executes instructions.

2. What is the purpose of a decoder in EU?

The decoder in EU translates instructions fetched from memory into a series of actions, which the EU carries out.

Give the register classification of 8086.

The 8086 contains:

i. General purpose registers:

They are used for holding data, variables and intermediate results temporarily.

ii. Special purpose registers:

They are used as segment registers, pointers, index register or as offset storage registers for particular addressing modes.