Addition and Subtraction

1(a) Addition and Subtraction of two 8-bit operands.

Addition

.MODEL SMALL
.STACK 64
.DATA
N1 DB 04H
N2 DB 04H
.CODE
START:
MOV AX,@DATA ;data segment initialization
MOV DS,AX ;data segment initialization
MOV AL,N1
MOV BL,N2
MOV AH,00H
MOV BH,00H
ADD AL,BL
INT 3H
END START

Input
AX=0004
BX=0004

Output
AX=0008

Subtraction

.MODEL SMALL
.STACK 64
.DATA
N1 DB 08H
N2 DB 04H
.CODE
START:
MOV AX,@DATA
MOV DS,AX
MOV AL,N1
MOV BL,N2
MOV AH,00H
MOV BH,00H
SUB AL,BL
INT 3H
END START

Input
AX=0008
BX=0004

Output
AX=0004

1(b) Addition and Subtraction of two 16-bit operands.

Addition
.MODEL SMALL
.STACK 64
.DATA
N1 DW 2222H
N2 DW 4444H
.CODE
START:
MOV AX,@DATA
MOV DS,AX
MOV AX,N1
MOV BX,N2
ADD AX,BX
INT 3H
END START

Input
AX=2222
BX=4444

Output
AX=6666


Subtraction

.MODEL SMALL
.STACK 64
.DATA
N1 DW 1234H
N2 DW 0234H
.CODE
START:
MOV AX,@DATA
MOV DS,AX
MOV AX,N1
MOV BX,N2
SUB AX,BX
INT 3H
END START

Input
AX=1234
BX=0234

Output
AX=1000

Multiplication and Division
2(a) Multiplication and Division of two 8-bit operands
Multiplication

.MODEL SMALL
.STACK 64
.DATA
N1 DB 33H
N2 DB 2FH
.CODE
START:
MOV AX,@DATA
MOV DS,AX
MOV AL,N1
MOV BL,N2
MUL BL
INT 3H
END START

Input
AX=0033
BX=002F

Output
AX=095D

Division

.MODEL SMALL
.STACK 64
.DATA
N1 DW 44H
N2 DB 33H
.CODE
START:
MOV AX,@DATA
MOV DS,AX
MOV AX,N1
MOV BL,N2
DIV BL
INT 3H
END START

Input
AX=0044
BX=0033

Output
AX=1101

2(b) Multiplication and Division of two 16-bit operands

Multiplication
.MODEL SMALL
.STACK 64
.DATA
N1 DW 2222H
N2 DW 3333H
.CODE
START:
MOV AX,@DATA
MOV DS,AX
MOV AX,N1
MOV BX,N2
MUL BX
INT 3H
END START

Input
AX=2222
BX=3333

Output
AX=92C6
DX=06D3

Division
.MODEL SMALL
.STACK 64
.DATA
N1 DW 1111H
N2 DW 1234H
N3 DW 5236H
.CODE
START:
MOV AX,@DATA
MOV DS,AX
MOV DX,N1
MOV AX,N2
MOV BX,N3
DIV BX
INT 3H
END START

  Input
DX=1111
AX=1234
BX=5236
   Output
AX=3525
DX=0266