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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