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W :----
W+1 :Y
W+2:Next instruction
Given as effective addrees as Z  index reg content=X
a)DIRECT  ea=Z =Y operand=M[Z]=M[Y]
b)INDIRECT Effective address is 
                     ea=Z=M[Y]  operand=M[[Y]]
c) RELATIVE assuming pc relative
Z=pc+relative value=W+2+Y  operand=M[W+2+Y]
d) INDEXED
Z=base value+index reg content
Z=Y+X operand=M[Y+X]

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