data segment
str1 db 'ABCDEFGHIJKL'
COUNT EQU $-STR1
buf db COUNT dup(?)
data ends
code segment
assume cs:code,ds:data,es:data
start:
mov ax,data
mov ds,ax
mov es,ax
lea si,str1+11
lea di,buf
mov cx,count
cld
lop:
movsb
sub si,2
loop lop
mov ah,4ch
int 21h
code ends
end start
为什么是si-2而不是si-1。。。