;程序名：T3－9，asm

;功能：说明根据计数法控制循环

DSEG SEGMENT

SUM DW ?

DSEG ENDS

CSEG SEGMENT

ASSUME CS:CSEG

START:MOV AX,40H

MOV DS,AX

MOV SI,0

MOV CX,1024

XOR AX,AX

AGAIN:ADD AX ,[SI]

INC SI

INC SI

LOOP AGAIN

;

ASSUME DS:DSEG

MOV BX,DSEG

MOV DS,BX

MOV SUM,AX

MOV AH,4CH

INT 21H

CSEG ENDS

EDN START

我刚学汇编，看见很多汇编源程序都有上述红色部分，确实看不出有什么作用！！