Thursday, May 16, 2019

8086 Assembly program to MULTIPLY two signed 8-bit numbers using SIGNED method

In assembly language 8086 we use mnemonics in order to perform arithmetic operations like  in MUL/IMUL subtraction.
So, Let's dive deep into what  MUL and IMUL is ...

MUL:- It multiplies unsigned byte/word from source with unsigned byte/word in AL/AX register.
Operation:-
When source is BYTE  then, AX← AL* unsigned 8-bit source
When source is BYTE  then, DX: AX← AX* unsigned 16-bit source

IMUL:- It multiplies signed byte/word from source with signed byte/word in AL/AX register.
Operation:-
When source is BYTE  then, AX←  AL* signed 8-bit source
When source is BYTE  then, DX: AX←  AX* signed 16-bit source

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


data segment
no1 db 02h
no2 db 03h
ans db ?
data ends
code segment
start : assume  cs :code,  ds :data
mov ax ,data
mov ds , ax
mov al , no1
mov bl ,no2
imul  b1
mov ans ,al
mov ah ,4ch
int 21h
code ends
end start

Programs:-


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