5-2.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,100D
 D1:  DEC  CX
      CMP  CX,0
      JNZ  D1

      ADD  AL,8
      CMP  AL,0F0H
      JZ   L0
      JMP  L1

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