��������������������������������

�������������������������������������������������� home1.gif (3987 bytes)�� Welcome ���������������������������������������������������������������������������������� ���������������������� �zzf Copyright/2000

��������������������� �������������������� Moon Over

��������������������������������� Program laborotory

��������������������������������� Web Site Module

��������������������������������� Game ����������

����������� ������������������

������������������������������������������������������������������������������������


Welcome to ZZF'S third Page
JAVA LIST/STACK/QUEUE CODE l

TAV - UQAM

Computer Organization and

Assembly Language

Department of Computer Science

Assignment #1

Instructor: F. SAID

Date Due: Next Week.

�

Question 1.

Add the following Hexadecimal values while considering that they are in 2?s complement 16-bit representation:

  1. 4ABC + 4ABC
  2. A123 + A321
  3. 0101 + 0101
  4. 0101 ? 0101
  5. CEBC ? FBDD

�

Question 2.

Show the respective 2s complement 8-bit representation of the following decimal numbers:

  1. 23
  2. ?68
  3. 150
  4. ?128
  5. 128
  6. 1126

�

Question 3.

Write an X68000 Assembly program that will prompt the user to input A, B, C, and D, calculate and then print the value of:

X = (A+B)*(B-C) / (B-D)*(A+D/C).

Question 4.

Considering having a hypothetical machine, show the fetch and execute cycles of the following machine instructions, as shown in memory. Assume that the initial value of your PC is at memory location 400, and that it increments by 2.

Mem-Addr---> Mem-content

400 ---> 1902
402 ---> 5904
404 ---> 5906
406 ---> 6908
408 ---> 290A
40A ---> 1904
40C ---> 7904
40E ---> 2904
?.
?.
902 ---> 00A0
904 ---> 0100
906 ---> 0101
908 ---> 0002
90A ---> 0234

Recall that:

1h: load from memory location to AC

2h: store from AC to memory location

5h: add from memory location to AC

6h: subtract memory location from AC

7h: multiply memory location by AC

Considering that X, Y, Z, U, and V are stored at memory locations: 902, 904, 906, 908, and 90A respectively, derive the formula(s) that this machine code is calculating.

newwindow 
Question1 :
A:4ABC+4ABC=9578
B A123+A321=4444
C 1010+0101=0202
D 0101-0101=0000
E CEBC-FBDD=C2DF
Question2
23=17
68=BC
150: out of range
-128:out of range
1126:out of range
Question4
Considering having a hypothetical machine, show the fetch and execute cycles of the following machine instructions, as shown in memory. Assume that the initial value of your PC is at memory location 400, and that it increments by 2. 
Mem-Addr---> Mem-content   AC
400 ---> 1902      0000
402       1902     00A0
402 ---> 5904      00A0
404 ---> 5906      01A0    
406 ---> 6908       02A1
408 ---> 290A       029F
40A ---> 1904      029F
40C ---> 7904       0100
40E ---> 2904      010000
    V=X+Y+Z-u
     Y=Y*Y

ani