7/25/2019 Sample Program format for MAP manual completion

1/2

Computer Department Quality Manual A R Kalsekar Polytechnic

9| P a g e b y U b a i d S a u d a g a r

Program No. 2a

Write an assembly language program to add two 16 bit numbers

Refer: prog2a.asm

Tools: Turbo Assembler (TASM) 1.4

Program:

assume cs : code

assume ds : data

data segment

a dw 1191h

b dw 2272h

sum dw ?

data ends

code segment

start:

mov ax,data

mov ds,ax

mov ax,0000h

mov ax,a

mov bx,b

add ax,bx

mov sum,ax

int 3

code ends

end start

7/25/2019 Sample Program format for MAP manual completion

2/2

Computer Department Quality Manual A R Kalsekar Polytechnic

10| P a g e b y U b a i d S a u d a g a r

Observation:

Conclusion:

We observe that after adding the two 16 bit numbers, the result is stored in the

AX register which is the destination register which is also of 16 bits.

Since result is not generating carry, the carry flag is in reset state i.e. C=0.

When the 16 bit result is stored in the memory, it will be stored as 03 34, this is

because the lower byte of the AX register gets stored first and then the higher

byte.