What are the direct and indirect addressing capacities of processors with the address widths (a) 4, (b) 8 and (c) 16?

The direct and indirect addressing capacities of processors with the address widths (a) 4, (b) 8 and (c) 16 :

The direct addressing capacity of a processor is found by calculating 2^A where A is the address width. Indirect addressing capacity is found by calculating 22^A Therefore,

Direct addressing capacity                      Indirect addressing capacity

(a) 2^A = 16                                              (a)   2^(2*4)  = 256 bytes

(b) 2⁸ = 256                                            (b)  2^(2*8) = 65536 bytes

(c) 2¹⁶ = 65536                                       (c)   2^(2*16) = 4294967295 bytes

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