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  <title>TI-85 Link Protocol Guide - Backup Transfers</title>
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<body bgcolor="#ffffe8">
<p><b>TI-85 Link Protocol Guide v1.0</b> - System Backup Transfers</p>
<center>
<h2>
<hr align="center"> System Backup Transfers</h2>
</center>
<p>A System Backup is one large transmission containing all
user-modifiable data in the calculator. The file format that the TI-85
Graph Link software uses can be found in the <a
 href="fformat.html#backup">file formats</a> section of this
documentation.</p>
<p>The protocol for all system backup transfers is shown below. For
information on packet formats, <a href="packet.html">click here</a>.</p>
<p>A computer can be either the sending unit or the receiving unit.</p>
<p>
<table bgcolor="#ffffff" border="1" cellspacing="0" width="92%">
  <tbody>
    <tr>
      <th bgcolor="#008800" width="7%"><font color="#ffffff">Step</font></th>
      <th colspan="3" bgcolor="#008800"><font color="#ffffff">Direction</font></th>
      <th bgcolor="#008800" width="80%"><font color="#ffffff">Packet</font></th>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="7%">
      <p align="center">1 </p>
      </td>
      <td rowspan="10">
      <p align="center"><img src="graphics/calc.gif" alt="Sending Unit"
 align="bottom" border="0" height="67" width="30"> </p>
      </td>
      <td bgcolor="#ffffff" width="6%">
      <p align="center"><img src="graphics/right.gif" alt="===&gt;"
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td rowspan="10">
      <p align="center"><img src="graphics/calc.gif"
 alt="Receiving Unit" align="bottom" border="0" height="67" width="30">
      </p>
      </td>
      <td bgcolor="#ffffff" width="80%">VAR with <a
 href="packet.html#backup">backup-style header</a> and type ID = 0x1D.</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="7%">
      <p align="center">2 </p>
      </td>
      <td bgcolor="#ffffff" width="6%">
      <p align="center"><img src="graphics/left.gif" alt="&lt;==="
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td bgcolor="#ffffff" width="80%">ACK</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="7%">
      <p align="center">3 </p>
      </td>
      <td bgcolor="#ffffff" width="6%">
      <p align="center"><img src="graphics/left.gif" alt="&lt;==="
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td bgcolor="#ffffff" width="80%">CTS or SKIP/EXIT. If exit, do
step 4 and quit.</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="7%">
      <p align="center">4 </p>
      </td>
      <td bgcolor="#ffffff" width="6%">
      <p align="center"><img src="graphics/right.gif" alt="===&gt;"
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td bgcolor="#ffffff" width="80%">ACK</td>
    </tr>
    <tr>
      <td width="7%">
      <p align="center">5 </p>
      </td>
      <td width="6%">
      <p align="center"><img src="graphics/right.gif" alt="===&gt;"
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td width="80%">DATA - section 1 (system data)</td>
    </tr>
    <tr>
      <td width="7%">
      <p align="center">6 </p>
      </td>
      <td width="6%">
      <p align="center"><img src="graphics/left.gif" alt="&lt;==="
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td width="80%">ACK</td>
    </tr>
    <tr>
      <td width="7%">
      <p align="center">7 </p>
      </td>
      <td width="6%">
      <p align="center"><img src="graphics/right.gif" alt="===&gt;"
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td width="80%">DATA - section 2 (user data)</td>
    </tr>
    <tr>
      <td width="7%">
      <p align="center">8 </p>
      </td>
      <td width="6%">
      <p align="center"><img src="graphics/left.gif" alt="&lt;==="
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td width="80%">ACK</td>
    </tr>
    <tr>
      <td width="7%">
      <p align="center">9 </p>
      </td>
      <td width="6%">
      <p align="center"><img src="graphics/right.gif" alt="===&gt;"
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td width="80%">DATA - section 3 (variable table?)</td>
    </tr>
    <tr>
      <td width="7%">
      <p align="center">10 </p>
      </td>
      <td width="6%">
      <p align="center"><img src="graphics/left.gif" alt="&lt;==="
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td width="80%">ACK</td>
    </tr>
  </tbody>
</table>
<i></i></p>
<p></p>
<p><u>Example (PC sending backup to TI):</u><br>
<table border="0" cellspacing="0" width="100%">
  <tbody>
    <tr>
      <td bgcolor="#ccffcc">PC:</td>
      <td bgcolor="#ccffcc" width="50%"><b><tt>05&nbsp;06&nbsp;09&nbsp;00&nbsp;</tt></b><tt>B1&nbsp;08&nbsp;1D&nbsp;B3&nbsp;19&nbsp;DA&nbsp;00&nbsp;F7&nbsp;8B&nbsp;<b>FE&nbsp;03</b></tt></td>
      <td bgcolor="#ccffcc" width="50%"><i>Variable header: Backup</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">TI:</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>85&nbsp;56&nbsp;09&nbsp;00</tt></b></td>
      <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of header</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">&nbsp;</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>85&nbsp;09&nbsp;09&nbsp;00</tt></b></td>
      <td bgcolor="#ffcccc" width="50%"><i>Clear to send backup</i></td>
    </tr>
    <tr>
      <td bgcolor="#ccffcc">PC:</td>
      <td bgcolor="#ccffcc" width="50%"><b><tt>05&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
      <td bgcolor="#ccffcc" width="50%"><i>Acknowledgement of CTS</i></td>
    </tr>
    <tr>
      <td bgcolor="#ccffcc">&nbsp;</td>
      <td bgcolor="#ccffcc" width="50%"><b><tt>05&nbsp;15&nbsp;B1&nbsp;08&nbsp;</tt></b>&lt;8B1h&nbsp;bytes&nbsp;of&nbsp;data&nbsp;plus&nbsp;checksum&gt;</td>
      <td bgcolor="#ccffcc" width="50%"><i>Backup data section 1
(system data)</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">TI:</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>85&nbsp;56&nbsp;B1&nbsp;08</tt></b></td>
      <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of data</i></td>
    </tr>
    <tr>
      <td bgcolor="#ccffcc">PC:</td>
      <td bgcolor="#ccffcc" width="50%"><b><tt>05&nbsp;15&nbsp;B3&nbsp;19&nbsp;</tt></b>&lt;19B3h&nbsp;bytes&nbsp;of&nbsp;data&nbsp;plus&nbsp;checksum&gt;</td>
      <td bgcolor="#ccffcc" width="50%"><i>Backup data section 2 (user
data)</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">TI:</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>85&nbsp;56&nbsp;B3&nbsp;19</tt></b></td>
      <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of data</i></td>
    </tr>
    <tr>
      <td bgcolor="#ccffcc">PC:</td>
      <td bgcolor="#ccffcc" width="50%"><b><tt>05&nbsp;15&nbsp;DA&nbsp;00&nbsp;</tt></b>&lt;DAh&nbsp;bytes&nbsp;of&nbsp;data&nbsp;plus&nbsp;checksum&gt;</td>
      <td bgcolor="#ccffcc" width="50%"><i>Backup data section 3
(variable table?)</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">TI:</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>85&nbsp;56&nbsp;DA&nbsp;00</tt></b></td>
      <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of data</i></td>
    </tr>
    <tr>
      <td bgcolor="#ccffcc">PC:</td>
      <td bgcolor="#ccffcc" width="50%"><b><tt>05 92 00 00</tt></b></td>
      <td bgcolor="#ccffcc" width="50%"><i>End Of Transmission (if PC
sending)<br>
      </i></td>
    </tr>
  </tbody>
</table>
For PC receiving backup from TI, swap 05 &amp; 85 IDs.<br>
<br>
<table border="0" cellspacing="0" width="100%">
  <tbody>
    <tr>
      <td width="32%">
      <p align="center"><a href="silent.html"><img
 src="graphics/prevpage.gif" alt="[previous page]" align="bottom"
 border="2" height="32" width="32"><br>
Silent transfers</a> </p>
      </td>
      <td width="34%">
      <p align="center"><a href="index.html"><img
 src="graphics/home.gif" alt="[home]" align="bottom" border="2"
 height="32" width="32"><br>
Table of Contents</a> </p>
      </td>
      <td width="34%">
      <p align="center"><a href="vars.html"><img
 src="graphics/nextpage.gif" alt="[next page]" align="bottom" border="2"
 height="32" width="32"><br>
Variable Formats</a> </p>
      </td>
    </tr>
  </tbody>
</table>
</p>
<hr align="center"> <i>Site maintained by Romain Li&eacute;vin (</i><a
 href="mailto:roms@lpg.ticalc.org"><i>roms@lpg.ticalc.org</i></a><i>)
and Tim Singer (</i><a href="mailto:tsinger@gladstone.uoregon.edu"><i>tsinger@gladstone.uoregon.edu</i></a><i>)</i>
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