The memory unit of the basic computer shown in Fig. 5-3 is to be changed to a 65,536x16 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. Figure 5.3: 15 IR 15 PC AR Memory 4096 words 16 bits per word 15 TR DR 7 0 7 OUTR INPR 15 AC Figure 5-3 Basic computer registers and memory. Figure 5.5: Figure 5-5 Basic computer instruction formats. 15 14 12 11 0 I Opcode Address (Opcode=000 through 110) (a) Memory-reference instruction 15 12 11 0 01 1 Register operation (Opcode 111, /= 0) (b) Register-reference instruction 15 12 11 0 1 1 1 1/0 operation (Opcode 111, 7=1) (c) Input-output instruction