实验2、1简单并行接口.ppt

实验二、简单并行接口;一、实验目的 掌握简单并行接口的工作原理及 使用方法， ;二、实验设备 ;实验箱;接口卡;50线扁平电缆;;;;四、实验电路图;D1 D2 D3 D4 D5 D6 D7 D8 CLK CLR;;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.;1A1 1A2 1A3 1A4 2A1 2A2 2A3 2A4 2G 1G;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.;;;开 始;code segment assume cs:code start: code ends end;code segment assume cs:code start: mov ah,2 ;回车符 mov dl,0dh int 21h mov ah,1 ;等待键盘输入 int 21h cmp al,27 ;判断是否为ESC键 je exit ;若是则退出 mov dx,2a8h ;若不是,从2A8H输出其ASCII码 out dx,al jmp start ;转start exit: mov ah,4ch ;返回DOS int 21h code ends end 273程序 ;开 始;;; code segment assume cs:code start: mov dx,2a0h ;从2A0输入一数据 in al,dx mov dl,al ;将所读数据保存在DL中 mov ah,02 ；显示ASCII为DL的数据 int 21h mov dl,0dh ;显示回车符 int 21h mov dl,0ah ;显示换行符 int 21h mov ah,06 ;是否有键按下 mov dl,0ffh int 21h jnz exit je start ;若无,则转start exit: mov ah,4ch ;返回DOS int 21h code ends end 244程序流程图 ;八、实验结果;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.;; 2 使用文本编辑工具软件EDIT.COM （基于DOS的工具软件）编辑输入汇编语言源程序，生成ASM文件;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.;;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.;图1;图2; 3 使用汇编程序MASM.EXE （微软工具），对源程序进行汇编，生成OBJ文件。;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.; 4 使用连接程序LINK.EXE （微软工具），对OBJ文件进