Start Debug, by going in to the MS-DOS window and entering DEBUG[enter] This may require a bit more than just this:

You will want to run this inside of DOSBOX(installed from https://www.dosbox.com/download.php?main=1)

The debug application itself is available at in the Week 9 debug link

Once you have entered Debug record the contents of the following registers: CS ____________ (Segment Value) IP ______________ (Offset Address)

Do the following in Debug: Type in those that are in BOLD [enter] is the one key

- A 100
??:0100	Mov AX,1
??:0103	Mov BX,2
??:0106	Mov CX,3
??:0109	ADD AX,BX
??:010B	ADD AX,CX
??:010D	INT 3
??:010E	[enter]

List the current contents of the following registers before program execution. (-R) IP _____________ CS _____________ AX _____________ BX _____________ CX ____________ DX ____________

Run the Program. (- G )

List the current contents of the following registers after program execution. IP _____________ CS _____________ AX _____________ BX _____________ CX ____________ DX ___________

The following is a table indicating the Flag descriptions and reflected values

Over Flow Flag	1 = OV 0 = NV	Zero Flag	1 = ZR 0 = NZ
Direction Flag	1 = DN 0 = UP	Auxillary Flag	1 = AC 0 = NA
Interrupt Flag	1 = EI 0 = DI	Parity Flag	1 = PE 0 = PO
Sign Flag	1 = NG 0 = PL	Carry Flag	1 = CY 0 = NC

What is the value of the Status Flags at this time. List the Flags and their value. OVER FLOW ______ Zero ______ Direction______ Auxillary ______ Interrupt ______ Sign ______Carry ______

How can you execute the program line by line? Why would you desire to?

Load a text file you have available in to debug __________________ name of file

What do you see when you perform the dump command? (briefly describe)

Load a .com or .exe file you have available in to debug __________________ name of file

What do you see when you perform the dump command? (briefly describe)

What do you see when you perform the unassemble command? (briefly describe)

Load another type of file you have available in to debug __________________ name of file

What do you see when you perform the dump command? (briefly describe)

Start Debug again, by going in to the MS-DOS window and entering DEBUG

Once you have entered Debug record the contents of the following registers: CS _____________ (Segment Value) IP ______________ (Offset Address)

Enter the following program

- A 100
??:0100	Mov AX,AAFF
??:0103	Mov BX,BB11
??:0106	Mov CX,CC00
??:0109	Mov DX,DD22
??:010C	Mov CX,DX
??:010E	Mov CL,BH
??:0110	ADD AL,BL
??:0112	ADD BX,AX
??:0114	ADD BX,DX
??:0116	ADD BL,CH
??:0118	INT 3
??:0119	[enter]

What are the expected contents of the following registers after the execution of the first 4 instructions AX _____________ BX _____________ CX ____________ DX ___________ IP ___________

What are the observed contents of the following registers after the execution of the first 4 instructions AX _____________ BX _____________ CX ____________ DX ___________ IP ___________

What is the expected result of the instruction MOV CX,DX AX _____________ BX _____________ CX ____________ DX ___________ IP ___________

What is the observed results of the instruction MOV CX,DX AX _____________ BX _____________ CX ____________ DX ___________ IP ___________

From the current values. What is the expected result of the instruction MOV CL,BH AX _____________ BX _____________ CX ____________ DX ___________ IP ___________

What is the observed results of the instruction MOV CL,BH AX _____________ BX _____________ CX ____________ DX ___________ IP ___________

From the current values. What is the expected result of the instruction ADD AL,BL AX _____________ BX _____________ CX ____________ DX ___________ IP ___________

What is the observed results of the instruction ADD AL,BL AX _____________ BX _____________ CX ____________ DX ___________ IP ___________

From the current values. What is the expected result of the instruction ADD BX,AX AX _____________ BX _____________ CX ____________ DX ___________ IP ___________

What is the observed results of the instruction ADD BX,AX AX _____________ BX _____________ CX ____________ DX ___________ IP ___________

From the current values. What is the expected result of the instruction ADD BX,DX AX _____________ BX _____________ CX ____________ DX ___________ IP ___________

What is the observed results of the instruction ADD BX,DX AX _____________ BX _____________ CX ____________ DX ___________ IP ___________

From the current values. What is the expected result of the instruction ADD BL,CH AX _____________ BX _____________ CX ____________ DX ___________ IP ___________

What is the observed results of the instruction ADD BL,CH AX _____________ BX _____________ CX ____________ DX ___________ IP ___________