Consider a hypothetical $64-$bit microprocessor having $64-$bit instructions composed of two fields: the first two bytes contain the opcode and the remainder the immediate operand or an operand address.

i$.$ What is the maximum directly addressable memory capacity in bytes?

ii$.$ Discuss the impact on the system speed if the microprocessor bus has

a$.$ A $64-$bit local address bus and a $32-$bit local data bus

iii. How many bits are needed for the program counter and the instruction register?

$(08$ Marks$)$