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<title>SCSI external (single)</title>
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<p align="center"><strong><font size="5" color="#0000FF"><u>外置SCSI接口(单端信号方式)</u></font></strong></p>

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    <td width="100%" align="center" height="26" bgcolor="#FFC8AA"><font color="#000080">[ <a target="_self" href="hardware.htm" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware.htm">返回目录</a> ]</font></td>
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<p><font color="#008080">SCSI 是 Small Computer System Interface 的缩写，外置式 50 
针接口的外观为母插座：</font></p>

<p><img src="conn_cent50f.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/conn_cent50f.gif" alt="50 PIN CENTRONICS FEMALE" WIDTH="294" HEIGHT="73"></p>

<p><font color="#008080">连接电缆插头为 50 针公插头：<br>
</font><img src="conn_cent50m.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/conn_cent50m.gif" alt="50 PIN CENTRONICS MALE" WIDTH="294" HEIGHT="73"></p>

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    <td width="100%" align="center" height="24" bgcolor="#C8C8FF"><font color="#000080">引脚定义</font></td>
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<p>　</p>

<table border="1" cellspacing="1">
  <tr>
    <th bgcolor="#0000FF"><font color="#FFFF00">Pin</font></th>
    <th bgcolor="#0000FF"><font color="#FFFF00">Name</font></th>
    <th bgcolor="#0000FF"><font color="#FFFF00">Dir</font></th>
    <th bgcolor="#0000FF"><font color="#FFFF00">Description</font></th>
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  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">1-25</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">GND</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrow.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrow.gif" alt="---" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Ground</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">26</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DB0</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="&lt;-&gt;" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data Bus 0</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">27</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DB1</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="&lt;-&gt;" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data Bus 1</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">28</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DB2</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="&lt;-&gt;" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data Bus 2</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">29</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DB3</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="&lt;-&gt;" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data Bus 3</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">30</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DB4</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="&lt;-&gt;" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data Bus 4</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">31</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DB5</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="&lt;-&gt;" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data Bus 5</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">32</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DB6</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="&lt;-&gt;" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data Bus 6</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">33</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DB7</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="&lt;-&gt;" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data Bus 7</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">34</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">PARITY</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="&lt;-&gt;" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data Parity (odd Parity)</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">35</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">GND</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrow.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrow.gif" alt="---" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Ground</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">36</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">GND</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrow.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrow.gif" alt="---" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Ground</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">37</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">GND</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrow.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrow.gif" alt="---" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Ground</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">38</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">TMPWR</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="&lt;-&gt;" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Termination Power</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">39</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">GND</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrow.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrow.gif" alt="---" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Ground</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">40</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">GND</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrow.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrow.gif" alt="---" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Ground</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">41</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">/ATN</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrowl.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowl.gif" alt="&lt;--" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Attention</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">42</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">n/c</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">-</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Not connected</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">43</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">/BSY</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="&lt;-&gt;" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Busy</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">44</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">/ACK</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrowl.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowl.gif" alt="&lt;--" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Acknowledge</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">45</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">/RST</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="&lt;-&gt;" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Reset</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">46</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">/MSG</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrowr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowr.gif" alt="--&gt;" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Message</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">47</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">/SEL</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="&lt;-&gt;" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Select</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">48</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">/C/D</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrowr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowr.gif" alt="--&gt;" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Control/Data</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">49</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">/REQ</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrowr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowr.gif" alt="--&gt;" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Request</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">50</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">/I/O</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF"><img src="arrowr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowr.gif" alt="--&gt;" WIDTH="32" HEIGHT="9"></font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Input/Output</font></td>
  </tr>
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