Programs for 16 bit arithmetic operations for 8086 (using various addressing modes)

Topic Content.

1. Addition of two 16-bit numbers

Aim:

To write an assembly language program to perform addition of two 16-bit signed  and unsigned numbers.

Tools:

PC installed with TASM.

Program:

ASSUME CS : CODE, DS : DATA
CODE SEGMENT
MOV AX, DATA
MOV DS, AX
MOV AX, OPR1
ADD AX, OPR2
MOV RES, AX
HLT
CODE ENDS
DATA SEGMENT
OPR1 DW 4269H
OPR2 DW 1000H
RES DW ?
DATA ENDS
END

List file:

ADDRESS	OPCODE	OPERATION	COMMENTS
0000	B88E4E	MOV AX,4E8E	INITIALIZATION OF  DATA SEGMENT
0003	8ED8	MOV DS,AX
0005	A10000	MOV AX,[0000]	THE VALUE IN [0000] IS MOVED  TO AX
0008	03060200	ADD AX,[0002]	THE VALUE IN [0002] IS ADDED    TO AX
000C	A30400	MOV [0004],AX	THE VALUE IN AX IS MOVED  TO [0004]
000F	F4	HLT	END OF PROGRAM

Flow Chart:

Result:

UNSIGNED NUMBERS

Flags:

Before execution, c=0, s=0, z=0, o=0, p=0, a=0, i=1, d=0.
After execution, c=0, s=0, z=0, o=0, p=1, a=0, i=1, d=0.

Input:

OPR1 = 4269H
OPR2 = 1000H

Output:

RES = 5269H

SIGNED NUMBERS

Flags:

Before execution, c=0, s=0, z=0, o=0, p=0, a=0, i=1, d=0.
After execution, c=1, s=0, z=0, o=1, p=0, a=0, i=1, d=0.

Input:

OPR1 = 9763H
OPR2 = A973H

Output:

RES = 40D6H

 

2. Subtraction of two 16-bit numbers

Aim:

To write an assembly language program to perform subtraction of two 16-bit  signed and unsigned numbers.

Tools:

PC installed with TASM.

Program:

ASSUME CS : CODE, DS : DATA
CODE SEGMENT
MOV AX, DATA
MOV DS, AX
MOV AX, OPR1
MOV BX, OPR2
SUB AX, BX
MOV RES, AX
HLT
CODE ENDS
DATA SEGMENT
OPR1 DW 4269H
OPR2 DW 1000H
RES DW ?
DATA ENDS
END

List file:

ADDRESS	OPCODE	OPERATION	COMMENTS
0000	B88E4E	MOV AX,4E8E	INITIALIZATION OF  DATA SEGMENT
0003	8ED8	MOV DS,AX
0005	A10000	MOV AX,[0000]	THE VALUE IN [0000] IS MOVED  TO AX
0008	2B060200	ADD AX,[0002]	THE VALUE IN [0002] IS SUBTRACTED   FROM AX
000C	A30400	MOV [0004],AX	THE VALUE IN AX IS MOVED  TO [0004]
000F	F4	HLT	END OF PROGRAM

Flow Chart:

Result:

UNSIGNED NUMBERS

 Flags: 

Before execution, c=0, s=0, z=0, o=0, p=0, a=0, i=1, d=0.
After execution, c=0, s=0, z=0, o=0, p=1, a=0, i=1, d=0.

Input:

OPR1 = 4269H
OPR2 = 1000H

Output:

RES = 3269H

SIGNED NUMBERS

Flags:

Before execution, c=0, s=0, z=0, o=0, p=0, a=0, i=1, d=0.
After execution, c=0, s=0, z=0, o=0, p=1, a=0, i=1, d=0.

Input:

OPR1 = 9763H
OPR2 = 8973H

Output:

RES = 0DF0H

 

3. Multiplication of two 16-bit unsigned numbers

Aim:

To write an assembly language program to perform multiplication of two 16-bit  unsigned numbers.

Tools:

PC installed with TASM.

Program:

ASSUME CS : CODE, DS : DATA
CODE SEGMENT
MOV AX, DATA
MOV DS, AX
MOV AX, OPR1
MUL OPR2
MOV RESLW, AX
MOV RESHW, DX
HLT
CODE ENDS
DATA SEGMENT
OPR1 DW 2000H
OPR2  DW 4000H
RESLW  DW ?
RESHW  DW ?
DATA ENDS
END

List file:

ADDRESS	OPCODE	OPERATION	COMMENTS
0000	B88E4E	MOV AX,4E8E	INITIALIZATION OF  DATA SEGMENT
0003	8ED8	MOV DS,AX
0005	A10000	MOV AX,[0000]	THE VALUE IN [0000] IS MOVED  TO AX
0008	F7260200	IMULWORD PTR [0002]	THE VALUE IN [0002] IS MULTIPLIED  BY AX
000C	A30400	MOV [0004],AX	THE VALUE IN AX IS MOVED  TO [0004]
000F	89160600	MOV [0006],DX	THE VALUE IN DX IS MOVED  TO [0006]
0013	F4	HLT	END OF PROGRAM

Flow Chart:

Result:

Flags:

Before execution, c=0, s=0, z=0, o=0, p=0, a=0, i=1, d=0.
After execution, c=1, s=0, z=0, o=1, p=0, a=0, i=1, d=0.

Input:

OPR1 = 2000H
OPR2 = 4000H

Output:

RESLW = 0000H (AX)
RESHW = 0800H (DX)

 

4. Multiplication of two 16-bit signed numbers.

Aim:

To write an assembly language program to perform multiplication of two 16-bit  signed numbers.

Tools:

PC installed with TASM.

Program:

ASSUME CS : CODE, DS : DATA
CODE SEGMENT
MOV AX, DATA
MOV DS, AX
MOV AX, OPR1
IMUL OPR2
MOV RESLW, AX
MOV RESHW, DX
HLT
CODE ENDS
DATA SEGMENT
OPR1 DW 7593H
OPR2 DW 6845H
RESLW DW ?
RESHW DW ?
DATA ENDS
END

List File:

ADDRESS	OPCODE	OPERATION	COMMENTS
0000	B88E4E	MOV AX,4E8E	INITIALIZATION OF  DATA SEGMENT
0003	8ED8	MOV DS,AX
0005	A10000	MOV AX,[0000]	THE VALUE IN [0000] IS MOVED  TO AX
0008	F72E0200	IMULWORD PTR [0002]	THE VALUE IN [0002] IS ADDED  TO AX
000C	A30400	MOV [0004],AX	THE VALUE IN AX IS MOVED  TO [0004]
000F	89160600	MOV [0006],DX	THE VALUE IN DX IS MOVED  TO [0006]
0013	F4	HLT	END OF PROGRAM

Flow Chart:

Result:

Case 1: Two positive numbers

Flags:

Before execution, c=0, s=0, z=0, o=0, p=0, a=0, i=1, d=0.
After execution, c=1, s=0, z=0, o=1, p=0, a=0, i=1, d=0.

Input:

OPR1 = 7593H
OPR2 = 6845H

Output:

RESLW = 689FH (AX)
RESHW = 2FE3H (DX)

Case 2: one positive number & one negative number

Flags:

Before execution, c=0, s=0, z=0, o=0, p=0, a=0, i=1, d=0.
After execution, c=1, s=0, z=0, o=1, p=0, a=0, i=1, d=0.

Input:

OPR1 = 8A6DH <- 2’s Complement of (-7593H)
OPR2 = 6845H

Output:

RESLW = 9761H (AX) <- 2’s Complement 
RESHW = D01CH (DX) <- of (-2FE3689FH)

Case 3: two negative numbers

Flags:

Before execution, c=0, s=0, z=0, o=0, p=0, a=0, i=1, d=0.
After execution, c=1, s=0, z=0, o=1, p=0, a=0, i=1, d=0.

Input:

OPR1 =  8A6DH <- 2’s Complement of (-7593H)
OPR2 = 97BBH  <- 2’s Complement of (-6845H)

Output:

RESLW = 689FH (AX)
RESHW = 2FE3H (DX)

 

5. Division of unsigned numbers

Aim:

To write an assembly language program to perform division of 16-bit unsigned number by 8-bit unsigned number.

Tools:

PC installed with TASM.

Program:

ASSUME CS : CODE, DS : DATA
CODE SEGMENT
MOV AX, DATA
MOV DS, AX
MOV AX, OPR1
DIV OPR2
MOV RESQ, AL
MOV RESR, AH
HLT
CODE ENDS
DATA SEGMENT
OPR1 DW 2C58H
OPR2 DB 56H
RESQ DB ?
RESR DB ?
DATA ENDS
END

List file:

ADDRESS	OPCODE	OPERATION	COMMENTS
0000	B88F4E	MOV AX,4E8F	INITIALIZATION OF  DATA SEGMENT
0003	8ED8	MOV DS,AX
0005	A10000	MOV AX,[0000]	THE VALUE IN [0000] IS MOVED  TO AX
0008	F6360200	DIV BYTE PTR [0002]	THE VALUE IN [0002] IS ADDED  TO AX
000C	A20300	MOV [0003],AX	THE VALUE IN AL IS MOVED  TO [0003]
000F	88260400	MOV [0004],DX	THE VALUE IN AH IS MOVED  TO [0004]
0013	F4	HLT	END OF PROGRAM

Flow Chart:

Result:

Flags:

Before execution, c=0, s=0, z=0, o=0, p=0, a=0, i=1, d=0.
After execution, c=0, s=0, z=0, o=0, p=0, a=1, i=1, d=0.

Input:

OPR1 = 2C58H (DIVIDEND)
OPR2 = 56H (DIVISOR)

Output:

RESQ = 84H (AL)
RESR = 00H (AH)

 

6. Division of signed numbers

Aim:

To write an assembly language program to perform division of 16-bit signed number by 8-bit signed number.

Tools:

PC installed with TASM.

Program:

ASSUME CS : CODE, DS : DATA
CODE SEGMENT
MOV AX, DATA
MOV DS, AX
MOV AX, OPR1
IDIV OPR2
MOV RESQ, AL
MOV RESR, AH
HLT
CODE ENDS
DATA SEGMENT
OPR1 DW 26F8H
OPR2 DB 0AAH
RESQ DW ?
RESR DW ?
DATA ENDS
END

List file:

ADDRESS	OPCODE	OPERATION	COMMENTS
0000	B88F4E	MOV AX,4E8F	INITIALIZATION OF  DATA SEGMENT
0003	8ED8	MOV DS,AX
0005	A10000	MOV AX,[0000]	THE VALUE IN [0000] IS MOVED  TO AX
0008	F63E0200	DIV BYTE PTR [0002]	THE VALUE IN [0002] IS ADDED  TO AX
000C	A20300	MOV [0003],AX	THE VALUE IN AL IS MOVED  TO [0003]
000F	88260400	MOV [0004],DX	THE VALUE IN AH IS MOVED  TO [0004]
0013	F4	HLT	END OF PROGRAM

Flow Chart:

Result:

Case 1:  two positive numbers

Flags:

Before execution, c=0, s=0, z=0, o=0, p=0, a=0, i=1, d=0.
After execution, c=0, s=0, z=0, o=0, p=0, a=1, i=1, d=0.

Input:

OPR1 = 26F8H (DIVIDEND)
OPR2 = 56H (DIVISOR)

Output:

RESQ = 74H (AL)
RESR = 00H (AH)

Case 2: one positive number & one negative number

Flags:

Before execution, c=0, s=0, z=0, o=0, p=0, a=0, i=1, d=0.
After execution, c=0, s=0, z=0, o=0, p=0, a=1, i=1, d=0.

Input:

OPR1 = D908H <- 2’s Complement of (-26F8H)
OPR2 = 56H

Output:

RESQ = 8CH (AL) <- 2’s Complement of (- 74H)
RESR = 00H (AH)

Case 3: one positive number & one negative number

Flags:

Before execution, c=0, s=0, z=0, o=0, p=0, a=0, i=1, d=0.
After execution, c=0, s=0, z=0, o=0, p=0, a=1, i=1, d=0.

Input:

OPR1 =  26F8H
OPR2 = AAH <- 2’s Complement of (-56H)

Output:

RESQ = 8CH (AL)  <- 2’s Complement of (- 74H)
RESR = 00H (AH)

 

7. ASCII addition

Aim:

To write an ALP to perform the addition of two ASCII bytes.

Tools:

PC installed with TASM.

Program:

ASSUME CS : CODE, DS : DATA
CODE SEGMENT
MOV AX, DATA
MOV DS, AX
MOV AH, 00H
MOV AL, CHAR
ADD AL, CHAR1
AAA
MOV RES, AX
HLT
CODE ENDS
DATA SEGMENT
CHAR DB '8'
CHAR1 DB '6'
RES DW ?
DATA ENDS
END

List file:

ADDRESS	OPCODE	OPERATION	COMMENTS
0000	B88E4E	MOV AX,4E8E	INITIALIZATION OF  DATA SEGMENT
0003	8ED8	MOV DS,AX
0005	B400	MOV AH,00	00H IS STORED IN AH
0007	A00000	MOV AL,[0000]	THE VALUE IN [0000] IS MOVED  TO AL
000A	02060100	ADD AL,[0001]	THE VALUE IN [0001] IS ADDED  TO AL
000E	37	AAA	ASCII ADJUST AFTER  ADDITION
000F	A30200	MOV [0002],AX	THE VALUE IN AX IS  MOVED TO [0002]
0012	F4	HLT	END OF PROGRAM

Flow Chart:

Result:

Flags:

Before execution, c=0, s=0, z=0, o=0, p=0, a=0, i=1, d=0.
After execution, c=1, s=0, z=0, o=0, p=1, a=1, i=1, d=0.

Input:

CHAR = '8'
CHAR1 = '6'

Output:

RES = 0104 (AX)  <- unpacked BCD of 14

 

8. ASCII substraction

Aim:

To write an ALP to perform the subtraction of two ASCII bytes.

Tools:

PC installed with TASM.

Program:

ASSUME CS : CODE, DS : DATA
CODE SEGMENT
MOV AX, DATA
MOV DS, AX
MOV AH, 00H
MOV AL, CHAR
SUB AL, CHAR1
AAS
MOV RES, AX
HLT
CODE ENDS
DATA SEGMENT
CHAR DB '9'
CHAR1 DB '5'
RES DW ?
DATA ENDS
END

List file:

ADDRESS	OPCODE	OPERATION	COMMENTS
0000	B88E4E	MOV AX,4E8F	INITIALIZATION OF  DATA SEGMENT
0003	8ED8	MOV DS,AX
0005	B400	MOV AH,00	00H IS STORED IN AH
0007	A00000	MOV AL,[0000]	THE VALUE IN [0000] IS MOVED  TO AL
000A	2A060100	SUB AL,[0001]	THE VALUE IN [0001] IS  SUBTRACTED FROM AL
000E	3F	AAS	ASCII ADJUST AFTER  SUBTRACTION
000F	A30200	MOV [0002],AX	THE VALUE IN AX IS  MOVED TO [0002]
0012	F4	HLT	END OF PROGRAM

Flow Chat:

Result:

Case 1: 

Flags:

Before execution, c=0, s=0, z=0, o=0, p=0, a=0, i=1, d=0.
After execution, c=0, s=0, z=0, o=0, p=0, a=0, i=1, d=0.

Input:

CHAR  = ‘9’
CHAR1 = ‘5’

Output:

RES = 0004 (AX)

Case 2:

Flags:

Before execution, c=0, s=0, z=0, o=0, p=0, a=0, i=1, d=0.
After execution, c=1, s=1, z=0, o=0, p=1, a=1, i=1, d=0.

Input:

CHAR  = ‘5’
CHAR1 = ‘9’

Output:

RES = FF06 (AX) <- 2’s Complement of (-4)

 

9. ASCII multiplication

Aim:

To write an ALP to perform the multiplication of two ASCII bytes.

Tools:

PC installed with TASM.

Program:

ASSUME CS : CODE, DS : DATA
CODE SEGMENT
MOV AX, DATA
MOV DS, AX
MOV AH, 00
MOV AL, NUM1
MUL NUM2
AAM
MOV RES, AX
HLT
CODE ENDS
DATA SEGMENT
NUM1 DB 09
NUM2 DB 05
RES DW ?
DATA ENDS
END

List file:

ADDRESS	OPCODE	OPERATION	COMMENTS
0000	B88E4E	MOV AX,4E8F	INITIALIZATION OF  DATA SEGMENT
0003	8ED8	MOV DS,AX
0005	B400	MOV AH,00	00H IS STORED IN  AH
0007	A00000	MOV AL,[0000]	THE VALUE IN [0000] IS MOVED  TO AL
000A	F6260100	MUL BYTE PTR [0001]	THE VALUE IN [0001] IS  MULTIPLIED BY AL
000E	D40A	AAM	ASCII ADJUST AFTER  MULTIPLCATION
000F	A30200	MOV [0002],AX	THE VALUE IN AX IS  MOVED TO [0002]
0012	F4	HLT	END OF PROGRAM

Flow Chart:

Result:

Flags:

Before execution, c=0, s=0, z=0, o=0, p=0, a=0, i=1, d=0.
After execution, c=0, s=0, z=0, o=0, p=1, a=0, i=1, d=0.

Input:

NUM1  =  09
NUM2 =  05

Output:

RES = 0405 (AX)  <- unpacked BCD of 45

 

10. ASCII division

Aim:

To write an ALP to perform the division of two ASCII numbers.

Tools:

PC installed with TASM.

Program:

ASSUME CS : CODE, DS : DATA
CODE SEGMENT
MOV AX, DATA
MOV DS, AX
MOV AX, DIVIDEND
AAD
MOV CH, DIVISOR
DIV CH
MOV RESQ, AL
MOV RESR, AH
HLT
CODE ENDS
DATA SEGMENT
DIVIDEND DW 0607H
DIVISOR DB 09H
RESQ DB ?
RESR DB ?
DATA ENDS
END

List file:

ADDRESS	OPCODE	OPERATION	COMMENTS
0000	B88F4E	MOV AX,4E8F	INITIALIZATION OF  DATA SEGMENT
0003	8ED8	MOV DS,AX
0005	A10000	MOV AH,[0000]	THE VALUE IN [0000] IS  MOVED TO AX
0008	D50A	AAD	ASCII ADJUST FOR  DIVIDION
000A	8A2E0200	MOV CH,[0002]	THE VALUE IN [0002] IS  MOVED TO CH
000E	F6F5	DIV CH	AX IS DIVIDED  BY CH
0010	A20300	MOV [0003],AL	THE VALUE IN AL IS  MOVED TO [0003]
0013	88260400	MOV [0002],AH	THE VALYE IN AH IS  MOVED TO [0004]
0017	F4	HLT	END OF  PROGRAM

Flow Chart:

Result:

Flags:

Before execution, c=0, s=0, z=0, o=0, p=0, a=0, i=1, d=0.
After execution, c=0, s=0, z=0, o=0, p=0, a=0, i=1, d=0.

Input:

DIVIDEND = 0607H <- unpacked BCD of 67
DIVISOR = 09H

Output:

RESQ = 07 (AL)
RESR = 04 (AH)