A Computer Structure, Assembly Language
CSCI 264

LAB 3

  

Objectives:

Practice with basic assembly language commands: MOV, ADD, SUB, MUL and DIV
Writing simple assembly language program and testing it out with Edlinas

• Reboot your computer into DOS
• Run Edlinas from the DOS prompt as follows:
  A:>EDL EXAMPLE.ASM

  Go into command interpreter by hitting the Escape key. Test out the following storage commands. before entering each command write down on this sheet what you expect the resulting contents of the destination register to be:
  MOV EAX, 10
  MOV EAX, 010H
  MOV EAX, 0AH
  MOV EAX, -2
  MOV EAX, -02H
  MOV AX, 27
  MOV BX, AX
  MOV CL, BH
  MOV AL, AH
  MOV EAX, ESI
  MOV AL, EBX ( this command is not legal, see what will happen)

  Test out the following arithmetic commands. Before entering each command write down on this sheet what change you expect the command to produce.
  MOV EAX, 0
  ADD EAX, 03H
  SUB AX, 2
  MOV EBX, 0FFFAH
  ADD EBX, EAX
  SUB BX, AX
  SUB BL, BH
  MOV AX, 10101H
  MOV BH, 8
  MUL BH
  MOV BX, 2
  MUL BX
  MOV EBX, 010101010H
  MUL EBX
  MOV AX, 19
  MOV BH, 5
  DIV BH
  MOV AX, 0400H
  MOV BH, 2
  DIV BH

  Write an Assembly language program that calculates the sum of 12 and -3, the product of 12 and 3, and the result of the integer division and the remainder of 27 and 8. For the multiplication and division write 3 different versions of the program: using 8 bit registers, 16 bit registers and 32 registers. You can execute the lines of your program one after another using command interpreter.