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CS401 Assembly Language Assignment Solution Fall 2012

Part (A):
Calculate physical address of the following segment offset pairs. Explain each and every step for calculating the physical address.                                  (Calculation:3 marks, Explanation:2 marks)

1. 2C3E:0199
2. 8000:0250

Part (B):
Assemble the given program using NASM.
(5 marks)
ORG 0100H
MOV AX,5H
ADD AX,44ABH
MOV BX,10
ADD AX,BX
SUB AX,0F12H
MOV BX,15
ADD AX,BX
MOV AX,0X4C00
INT 0X21
solution of part B:

1	ORG 0100H	AX	0005	0103	0	0	0	0	1
		BX	0000
2	MOV AX,5H	AX	44B0	0106	0	0	0	0	1
		BX	0000
3	ADD AX,44ABH	AX	44B0	0109	0	0	0	0	1
		BX	000A
4	MOV BX,10	AX	44BA	010B	0	0	0	0	0
		BX	000A
6	ADD AX,BX	AX	35A8	010E	0	0	0	0	0
		BX	000A
7	SUB AX,0F12H	AX	35A8	0111	0	0	0	0	0
		BX	000F
8	MOV BX,15	AX	35B7	0113	0	0	1	0	0
		BX	000F
9	ADD AX,BX	AX	4C00	0116	0	0	1	0

1. Now we execute the program with F2 key (instruction will move one by one) and write down the contents of the specified registers in the given table.

	Instruction	Register current value after the instruction execution		IP (Instruction Pointer)	Flags
					CF	ZF	PF	SF	AF
1	ORG 0100H	AX
		BX
2	MOV AX,5H	AX
		BX
3	ADD AX,44ABH	AX
		BX
4	MOV BX,10	AX
		BX
6	ADD AX,BX	AX
		BX
7	SUB AX,0F12H	AX
		BX
8	MOV BX,15	AX
		BX
9	ADD AX,BX	AX
		BX

Question No. 2:
Now after attempting previous question, You are able to write, assemble and debug a program. So write a program using Conditional Jump instructions that will add all odd numbers between 1 to 20 (not including 1 & 20). Explain each instruction of program in your own words and also attach the snapshot of your AFD showing the executed code results.
(Program:5 marks, Explanation: 3 marks & Snapshot: 2 marks)
Note: Provide snapshot of your program which will be run in AFD window. It is strictly prohibited the copied assignment.

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