54. SEPARATING POSITIVE & NEGATIVE NUMBERS

MOV SI,1100

      MOV CX,0A

      MOV AL,00

L2: MOV BX,[SI]

      ADD BX,00H

      JS L1

      INC SI

      INC AL

      DEC CX

      JNZ L2

      JMP L3

L1: INC SI

      INC AH

      DEC CX

      JNZ L2

L3: HLT

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53. MATRIX MULTIPLICATION IN 8086

MOV SI,1000

       MOV BP,1020

       MOV DI,1050

L2:  MOV CX,00

L1:  MOV AL,[SI]

       MOV BL,[BP]

       MUL BL

       ADD CX,AX

       ADD BP,03

       INC SI

       CMP BP,1029

       JB L1

       SUB SI,03

       SUB BP,08

       ADD DI,02

       CMP BP,1023

       JB L2

      ADD SI,03

      SUB BP,03

      CMP DI,1051

       JB L2

HLT

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52. CODE CONVERSION IN 8086

ASCII ADJUSTMENT INSTRUCTIONS

CODE SEGMENT

ASSUME CS:CODE

START: MOV AX,31H

ADD AX,39H

AAA

ADD AX,3030H

MOV BL,9

MOV AX,0702H

AAD

DIV BL

MOV AL,5

MOV CL,5

MUL CL

AAM

ADD AX,3030H

MOV AX,38H

SUB AX,31H

AAS

AX,3030H

MOV AH,4CH

INT 21H

CODE ENDS

END START

BINARY TO BCD CONVERSION

DATA SEGMENT

BIN DW 01A9H

BCD DB 2 DUP(0)

DATA ENDS

CODE SEGMENT

ASSUME CS:CODE,DS:DATA

START: MOV AX,DATA

MOV DS,AX

MOV AX,BIN

MOV CL,64H

DIV CL

MOV BCD+1,AL

MOV AL,AH

MOV AH,00H

MOV CL,0AH

DIV CL

MOV CL,04

ROR AL,CL

ADD AL,AH

MOV AH,4CH

INT 21H

CODE ENDS

END START

Input: binary--------01A9

Output: bcd------------425

BCD TO BINARY CONVERSION

DATA SEGMENT

BCD DW 27H

BIN DW ?

DATA ENDS

CODE SEGMENT

ASSUME CS:CODE,DS:DATA

START: MOV AX,DATA

MOV DS,AX

MOV AX,BCD

AND AX,07H

MOV BX,AX

MOV AX,BCD

AND AX,0F0H

MOV CX,0AH

MUL CX

ADD AX,BX

MOV BIN,AX

MOV AH,4CH

INT 21H

CODE ENDS

END START

Input: BCD-------------27

Output:------------------1B

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51. BLOCK TRANSFER IN 8086

DATA SEGMENT

X DB 01H,02H,03H,04H,05H

DATA ENDS

CODE SEGMENT

ASSUME CS:CODE,DS:DATA

START:MOV AX,DATA

MOV DS,AX

MOV CX,05H

LEA SI,X+04

LEA DI,X+04+03

UP: MOV BL,[SI]

MOV [DI],BL

DEC SI

DEC DI

DEC CX

JNZ UP

MOV AH,4CH

INT 21H

CODE ENDS

END START

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50. BLOCK INTERCHANGE IN 8086

DATA SEGMENT

X DB 01H,02H,03H,04H,05H

Y DB 11H,12H,13H,14H,15H

DATA ENDS

CODE SEGMENT

ASSUME CS:CODE,DS:DATA

START:MOV AX,DATA

MOV DS,AX

MOV CX,05H

LEA SI,X

LEA DI,Y

UP: MOV BL,[SI]

MOV AL,[DI]

MOV [SI],AL

MOV [DI],BL

INC SI

INC DI

DEC CX

JNZ UP

MOV AH,4CH

INT 21H

CODE ENDS

END START

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49. 16 & 32-BIT SUBTRACTION IN 8086

16-BIT SUBTRACTION

DATA SEGMENT

NUM DW 4567H,2345H

DIF DW 1 DUP(0)

DATA ENDS

CODE SEGMENT

ASSUME

CS:CODE,DS:DATA

START: MOV AX,DATA

MOV DS,AX

CLC

                             

LEA SI,NUM                          

MOV AX,[SI]                         

SBB AX,[SI+2]                       

MOV DIF,AX                                   

MOV AH,4CH

INT 21H

CODE ENDS

END START

INPUT: 4567H,2345H

OUTPUT:2222

32-BIT SUBTRACTION

DATA SEGMENT

NUM1 DW 2345H,6762H

NUM2 DW 1111H,1111H

DIF DW 2 DUP(0)

DATA ENDS

CODE SEGMENT

ASSUME CS:CODE,DS:DATA

START: MOV AX,DATA

MOV DS,AX

LEA SI,NUM1

LEA DI,NUM2

MOV AX,[SI]

MOV BX,[DI]

SUB AX,BX

MOV DIF,AX

INC SI

INC SI

INC DI

INC DI

MOV AX,[SI]

MOV BX,[DI]

SBB AX,BX MOV DIF+2,AX

MOV AH,4CH

INT 21H

CODE ENDS

END START

INPUT: 23456762,-11111111

OUTPUT:12345651

INPUT:11111111,-23451234

OUTPUT:EDCBFEDD

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48. 16-BIT MULTIPLICATION IN 8086

16-BIT MULTIPLICATION FOR UNSIGNED NUMBERS

DATA SEGMENT

NUM DW 1234H,1234H

PROD DW 2 DUP(0)

DATA ENDS

CODE SEGMENT

ASSUME CS:CODE,DS:DATA

START: MOV AX,DATA

MOV DS,AX

LEA SI,NUM

MOV AX,[SI]

MOV BX,[SI+2]

MUL BX

MOV PROD,AX

MOV PROD+2,DX

MOV AH,4CH

INT 21H

CODE ENDS

END START

INPUT: Multiplicand- 1234H,

           Multiplier-   1234H

OUTPUT: DX-01 4B

              AX-54 90

16-BIT MULTIPLICATION FOR SIGNED NUMBERS

DATA SEGMENT

NUM DW -2,1

PROD DW 2 DUP(0)

DATA ENDS

CODE SEGMENT

ASSUME CS:CODE,DS:DATA

START: MOV AX,DATA

MOV DS,AX

LEA SI,NUM

MOV AX,[SI]

MOV BX,[SI+2]

IMUL BX

MOV PROD,AX

MOV PROD+2,DX

MOV AH,4CH

INT 21H

CODE ENDS

END START

INPUT: Multiplicand- -2,

           Multiplier-   1

OUTPUT: DX – FF FF

               AX – FF FE

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47. 16-BIT DIVISION IN 8086

16-BIT DIVISION FOR SIGNED NUMBERS

DATA SEGMENT

NUM1 DW 4567H,2345H

NUM2 DW 4111H

QUO DW 2 DUP(0)

REM DW 1 DUP(0)

DATA ENDS

CODE SEGMENT

ASSUME CS:CODE,DS:DATA

START: MOV AX,DATA

MOV DS,AX

MOV AX,NUM1

MOV DX,NUM1+2

DIV NUM2

MOV QUO,AX

MOV REM,DX

MOV AH,4CH

INT 21H

CODE ENDS

END START

INPUT:       Dividend - 23454567,

                 Divisor - 4111,

OUTPUT:    AX – 8AC5H (quotient);

                 DX – 0952H (reminder);

16-BIT DIVISION FOR UNSIGNED NUMBERS

DATA SEGMENT

NUM1 DW 4567H,2345H

NUM2 DW 4111H

QUO DW 2 DUP(0)

REM DW 1 DUP(0)

DATA ENDS

CODE SEGMENT

ASSUME CS:CODE,DS:DATA

START: MOV AX,DATA

MOV DS,AX

MOV AX,NUM1

MOV DX,NUM1+2

CWD

IDIV NUM2

MOV QUO,AX

MOV REM,DX

MOV AH,4CH

INT 21H

CODE ENDS

END START

INPUT:   Dividend - -44444444,

 Divisor - 2222,

0UTPUT:  AX – FE (quotient);

               DX – FF (reminder)

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46. 16 & 32 BIT ADDITION IN 8086

16-BIT ADDITION

DATA SEGMENT

NUM DW 1234H, 0F234H

SUM DW 2 DUP(0)

DATA ENDS

CODE SEGMENT

ASSUME CS: CODE, DS:DATA

START: MOV AX,DATA

MOV DS,AX

MOV AX,NUM

MOV BX,0H

ADD AX,NUM+2

JNC DOWN

INC BX

DOWN: MOV SUM,AX

MOV SUM+2,BX

MOV AH,4CH

INT 21H

CODE ENDS

END START

INPUT :     1234H,   F234H

OUTPUT : 10468H

32-BIT ADDITION

DATA SEGMENT

NUM1 DW 0FFFFH,0FFFFH

NUM2 DW 1111H,1111H

SUM DW 4 DUP(0)

dATA ENDS

CODE SEGMENT

ASSUME CS:CODE,DS:DATA

START: MOV AX,DATA

MOV DS,AX

MOV AX,NUM1

ADD AX,NUM2

MOV SUM,AX

MOV AX,NUM1+2

ADC AX,NUM2+2

JNC DOWN

MOV SUM+4,01H

DOWN: MOV SUM+2,AX

MOV AH,4CH

INT 21H

CODE ENDS

END START

INPUT:     0FFFFFFFFH,      011111111H

OUTPUT: 0111111110H

32-BIT ADDITION USING DD DIRECTIVE

DATA SEGMENT

NUM1 DW 12345678H

NUM2 DW 12345678H

SUM DW 3 DUP(0)

DATA ENDS

CODE SEGMENT

ASSUME CS:CODE,DS:DATA

START:MOV AX,DATA

MOV DS,AX

LEA SI,NUM1

LEA DI,NUM2

MOV AX,[SI]

ADD AX,[DI]

MOV CX,[SI+2]

ADC CX,[DI+2]

JNC DOWN

MOV SUM+4,01H

DOWN:MOV SUM,AX

MOV SUM+2,CX

MOV AH,4CH

INT 21H

CODE ENDS

END START

INOUT:      12345678H,     12345678H

OUTPUT:   2468ACF0H

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45. 8-BIT DIVISION IN 8086

8-BIT DIVISION FOR UNSIGNED NUMBERS

DATA SEGMENT

NUM1 DB 72H,

NUM2 DB 02H

QUO DB 1 DUP(0)

REM DB 1 DUP(0)

DATA ENDS

CODE SEGMENT

ASSUME CS:CODE,DS:DATA

START: MOV AX,DATA

MOV DS,AX

MOV AL,NUM1

MOV AH,0H

DIV NUM2

MOV QUO,AL

MOV REM,AH

MOV AH,4CH

INT 21H

CODE ENDS

END START

INPUT:        Dividend - 72H,

                    Divisor - 02 H,

0UTPUT:     AL - 39H (quotient);

                    AX - 00H (reminder);

INPUT:       Dividend - 55H,

                   Divisor - 04 H,

0UTPUT:    AL - 15H (quotient);

                   AX - 01H (reminder);

8-BIT DIVISION FOR SIGNED NUMBERS

DATA SEGMENT

NUM1 DB -10

NUM2 DB 02

QUO DB 1 DUP(0)

REM DB 1 DUP(0)

DATA ENDS

CODE SEGMENT

ASSUME CS:CODE,DS:DATA

START: MOV AX,DATA

MOV DS,AX

MOV AL,NUM1

CBW

IDIV NUM2

MOV QUO,AL

MOV REM,AH

MOV AH,4CH

INT 21H

CODE ENDS

END START

INPUT:   Dividend - -10

                Divisor - 03

0UTPUT:  AL – FDH (quotient);

                 AX – FF H (reminder) ; Result is in two complement form

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