CSCI 150 Homework 8

Due Friday, April 11, at the beginning of class.

For each of the problems below, use the "assembly language" described in your text, the P88 Machine Assembly Language (described on page 265 and in more detail in Chapter 9).

Problem 1. (essentially problem #1 on page 268)
Consider the following assembly language program:

     IN    AX
     COPY  M1, AX
     SUB   AX, M1
     CMP   AX, M1
     JB    LAB1
     OUT   AX
     JMP   LAB2
LAB1 COPY  AX, M1
     DIV   AX, M1
     OUT   AX
LAB2 END

a) What is the output of the above program if the input is 4?

b) What is the output of the above program if the input is 0?

c) Briefly describe how the program works.

Problem 2.
Write an assembly language program that reads two integers and prints their product.

Problem 3. (essentially text problem #2 on page 268).
Write an assembly language program that reads two integers and prints the larger one.

What To Turn In.

• A printout of this sheet with the answers filled in.
• Print your name at the top of the cover page and staple it to the top of your solutions.