lcm.asm

DATA SEGMENT
  NUM DW 05,04
  LCM DW 2 DUP(0)
DATA ENDS
CODE SEGMENT
  ASSUME CS:CODE,DS:DATA
  START: MOV AX,DATA
  MOV DS,AX
  MOV DX,0H
  MOV AX,NUM
  MOV BX,NUM+2
  UP: PUSH AX
  PUSH DX
  DIV BX
  CMP DX,0
  JE EXIT
  POP DX
  POP AX
  ADD AX,NUM
  JNC DOWN
  INC DX
  DOWN: JMP UP
  EXIT: POP LCM+2
  POP LCM
  MOV AH,4CH
  INT 21H
CODE ENDS
END START