4 1. Suppose you are designing a processor for a computer that will use a very slow memory technology when values are not stored in a register circuit. Will you choose a zero-address architecture? Why or why not? + 2. What is the greatest number of bits for an immediate operand of a fixed length ISA having a fixed size opcode? + 4 3. Suppose that in addition to other hardware, the CPU used in a smartphone contains additional hardware to enable running software for three previous versions of the of the chip (i.e., three backward compatibility modes). What is the disadvantage from a smartphone user's point of view? +