PUSH      BX
PUSH      CX //一般是变量（不是寄存器）参数入栈，然后用通过sp的值来读取参数 
CALL      compute //也免得你手动保存和恢复 ip，而和 结尾ret的作用 重复了
－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－
；帮你注释掉了多余的代码，并加了以暂停的代码。
data          SEGMENT
buf           DB        4,5,6,7,8
count         EQU        $-buf
result        DW        ?
data          ENDS
              
stack         SEGMENT  
              DB        20 DUP(?)
stack         ENDS
              
code          SEGMENT
              ASSUME    CS:code,DS:data,SS:stack
main          PROC      FAR
start:        
              MOV       AX,data
              MOV       DS,AX
              MOV       AX,stack
              MOV       SS,AX
              MOV       BX,OFFSET buf
              MOV       CX,count
                  ;PUSH      BX
                  ;PUSH      CX
              CALL      compute
                  ; RET
              ADD       DL,14h
              MOV       AH,2
              INT       21h
            
            mov ah,1;暂停
            int 21h ;任意键关闭

              MOV       AH,4ch
              INT       21h
                       
main          ENDP
              
compute       PROC      NEAR
                 ;POP       AX
                 ;POP       CX
                 ; POP       BX
              MOV       DX,0             
              MOV       SI,0
LOOP1:        
              ADD       DL,[BX+SI]
              INC       SI
              LOOP      LOOP1
                 ;MOV       result,DX
                 ;PUSH      AX
              RET
compute       ENDP
code          ENDS
              END       main