5. For the computer MARIE from the text:

a) Briefly describe the function of

PC, IR, MAR, MBR, and AC

b) MARIE has a memory of 4096 16-bit words. How many bits

are the MAR, PC, AC, MBR, and IR. Why?

c) Briefly describe and diagram an example to show how the JnS X and JumpI X

instructions are used on MARIE to implement subroutine call and return.