Assembly 8086 program for addition of two 16-bit numbers

In assembly language 8086 we use mnemonics in order to perform arithmetic operations like ADD/ADC in addition.

So, Let's dive deep into what ADD and ADC is ...

ADD:- It adds number from source to destination without carry. Source can be memory location or register or a number but destination should be register or a memory location(not immediate number). Remember that source and destination should be of same type and both shouldn't be memory locations.

Syntax: ADD <destination> <source>
Operation: destination← destination + source

ADC:- It adds number from source to destination with carry i.e , adds carry flag into result of addition. Source can be memory location or register or a number but destination should be register or a memory location(not immediate number). Remember that source and destination should be of same type and both shouldn't be memory locations.

Syntax: ADC <destination> <source>
Operation: destination← destination + source + carry

Which flags get affected?
Ans- OF , CF, PF , AF, SF , ZF .

data segment

no1 dw 21h

no2 dw 31h

ans dw ?

data ends

code segment

start : assume  cs :code,  ds :data

mov ax ,data

mov ds , ax

mov ax , no1

mov bx , no2

ADD ax , bx

mov ans ,ax

mov ah ,4ch

int 21h

code ends

end start

Programs:-


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