MULTIPLY MACRO VALUE1, VALUE2, RESULT
  LOCAL BACK
  MOV BX,VALUE1 
  MOV CX,VALUE2 
  SUB AX,AX 
  MOV DX,AX 
BACK: ADD AX,BX 
  ADC DX,00 
  LOOP BACK 
  MOV RESULT,AX 
  MOV RESULT+2,DX 
  ENDM