.8087
  PAGE 60,132
  .MODEL SMALL
  .STACK 32
  .DATA
  ORG 00H
  X DD 9.75
  ORG 10H
  Y DD 13.09375
  ORG 20H
  Z DD 29.0390625
  ORG 30H
  SUM DD ?
  .CODE
  START PROC FAR
  MOV AX,@DATA
  MOV DS,AX
  CALL CSUM
  MOV AH,4CH
  INT 21H
  START ENDP
  CSUM PROC NEAR
  FINIT 
  FLD X 
  FLD Y 
  FLD Z 
  FADD ST(0),ST(1) 
  FADD ST(0),ST(2) 
  FST SUM 
  RET
  CSUM ENDP
  END START