The memory unit of a computer has 256K words of 32 bits each. The computer has an  instruction format with 4 fields: an opcode field; a mode field to specify 1 of 7  addressing modes; a register address field to specify one of 60 registers; and a memory  address field. Assume an instruction is 32 bits long. Answer the following: a. How large must the mode field be? b. How large must the register field be? c. How large must the address field be? d. How large is the opcode field?

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