1. Consider a system using 12-bit instructions. The machine only supports 8 instructions (opcodes). Each instruction can reference 1 of the machine's 4 general purpose registers, and one memory address. If the machine uses a byte-addressable architecture (each byte of memory is separately addressable), what is the maximum size main memory that is practical for this system? Why?

2. Assume A and B represent variables on a machine using a Stack Architecture. Write a PUSH / POP operation to compute the following: (A+B)/(A-B)