两数差的绝对值

DATA SEGMENT
  NUM1 DW 462H
  NUM2 DW 30AH
  RESULT DW 0
DATA ENDS

STACK SEGMENT STACK
  DB 50 DUP(0)  
STACK ENDS

CODE SEGMENT
  ASSUME DS:DATA,SS:STACK,CS:CODE
START: MOV AX,DATA
       MOV DS,AX
       MOV AX,NUM1
       SUB AX,NUM2
       JNB PLUS
       NEG AX
PLUS: MOV RESULT,AX 
      MOV AH,4CH
      INT 21H
CODE ENDS
     END START