Due 9 November

Do the following problems from the Chapter 4 (pp. 119-122) of the textbook:

- Problem 4-3
- Problem 4-19
- Problem 4-21

Using two eight-bit adder-subtractors, similar to the one shown in Figure 4-7, two eight-bit registers, and an appropriate number of multiplexers show how to implement the following RTL statements:

`x`: R1 <- R1 + 1`x`': R1 <- 0`y`: R2 <- R1`y`': R2 <- R2 - 1