a. Direct AM: Effect address is equal to the address part of instruction.
In instruction, Z will be equal to Y.
b. Indirect AM: Address field of the instruction gives the address where the effective address is stored.
Y will Store the address of Z
c. Relative A.M: The content of the PC is added to the address part of the instruction.
Y will be added to PC.
d. Indexed AM: Content of an index register is added to the part of the instruction to obtain the effective address.
Effective Address will be Y+X