What is the maximum directly addressable memory capacity of 64 bit microprocessor having 64-bit instruction composedof two fields the first 2 bytes for op code and the remaining for the operand addres?

A 64-bit microprocessor can theoretically address 2^64 bytes of memory, which equals 16 exabytes. However, in this case, the instruction format specifies that the first 2 bytes are for the opcode, leaving 62 bits for the operand address. Therefore, the maximum directly addressable memory capacity is 2^62 bytes, which equals 4 petabytes.