5-1.asm

TCP_USB试验平台下的几个常见的实验的相应要求与代码

DATA  SEGMENT
DAP  EQU  2A0H
DATA  ENDS
CODE  SEGMENT
MAIN  PROC  FAR
ASSUME CS:CODE,DS:DATA
START:
      XOR AX,AX
      MOV AX,DATA
      MOV DS,AX
      MOV DX,DAP
L0:   MOV AL,00H
L1:   OUT DX,AL

      MOV CX,1000H
D1:   DEC CX
      CMP CX,0
      JNZ D1

      ADD AL,16
      CMP AL,0F0H
      JZ  L0
      JMP L1

      MOV AH,4CH
      INT 21H
CODE  ENDS
END  START