Suppose you have the instruction Add 900. Given the memory as follows, the contents of AC and the base register are 200 and 100 respectively. [6 marks]

Memory address value 800 900 900 1000 1000 500 1100 600 1200 800 1300 250

What would be loaded into the AC, if the addressing mode for the operand is:

1. Immediate
2. Direct
3. Indirect
4. Indexed