The memory unit of the basic computer shown in Fig. 5-3 is to be changed to a 65,536 x 16 memory, requiring an address of 16 bits. The instruction format of a memory-reference instruction shown in Fig. 5-5(a) remains the same for I = 1 (indirect address) with the address part of the instruction residing in positions 0 through 11. But when I = 0 (direct address), the address of the instruction is given by the 16 bits in the next word following the instruction. Modify the microoperations during time T₂, T₃, (and T₄. if necessary) to conform with this configuration.

Fig. 5-3

Fig. 5-5(a)

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15 15 7 OUTR 11 B 11 IR TR 0 7 PC AR INPR 0 0 0 15 15 Memory 4096 words 16 bits per word DR AC