p173.asm

王爽汇编语言的课件

assume cs:code
code segment
start:mov ax,2000h
      mov ds,ax
      mov bx,0
    s:mov cl,[bx]
      mov ch,0
      jcxz ok
      inc bx
      loop s
   ok:dec bx
      mov dx,bx
      mov ax,4c00h
      int 21h
code ends
end start