# Homeworks #5 and #6 and another quiz warning

## Postponing of due date for homework #4

Homework #5 is now due on 8 March.

## Homework #5 -- Due 22 March

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

• Problem 4-2.
• Problem 4-10.
• Problem 4-12(e).
• Problem 4-21.

## Homework #6 -- Due 29 March

This problem is to design a Nabs dispenser. Your machine has two inputs, x and y, which encode the following information:

```
x  y    Meaning
0  0    nothing is happening
0  1    nickel inserted
0  1    dime inserted
1  1    Nabs button pushed
```

There is a single output, z. When z is 0, the machine produces nothing. When z is 1, the machine outputs a packages of Nabs.

Assume that Nabs cost 15 cents. Nabs are returned only if the Nabs button is pushed after 15 cents are deposited. Assume that this %!@%\$# machine returns no change and just keeps any money you deposit over 15 cents.

Show how to implement that machine in a sequential circuit. Enter your circuit into diglog to test it.

## Quiz -- 8 March

At the end of class on Tuesday, 8 March, there will be a brief (30 minute) quiz on Chapters 2 and 3 of the textbook.