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  <title>TI-73 Link Protocol Guide - File formats</title>
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<body bgcolor="#ffffe8">
<p><b>TI-73 Link Protocol Guide v1.1</b> - File formats</p>
<center>
<h2>
<hr align="center">File Formats</h2>
</center>
<p>The TI-73 Graph Link software stores variables in several types of
files. Single variables are stored in files that have an extension that
corresponds with their type. Groups of variables are stored in files
with the extension ".73g". However, all of these file types have a
common format.</p>
<p>The different file types and contents that the TI-73 Graph Link
software can read and write are shown below.</p>
<p>
<table border="1" cellspacing="0" width="66%">
  <tbody>
    <tr>
      <th bgcolor="#dddddd" width="13%">Extension</th>
      <th bgcolor="#dddddd">Description</th>
    </tr>
    <tr>
      <td width="13%">
      <p align="center">.73g </p>
      </td>
      <td>Multiple TI-73 variables of varying types (group)</td>
    </tr>
    <tr>
      <td width="13%">
      <p align="center">.73i </p>
      </td>
      <td>TI-73 picture (image)</td>
    </tr>
    <tr>
      <td width="13%">
      <p align="center">.73k </p>
      </td>
      <td>TI-73 FLASH application</td>
    </tr>
    <tr>
      <td width="13%">
      <p align="center">.73l </p>
      </td>
      <td>TI-73 list</td>
    </tr>
    <tr>
      <td width="13%">
      <p align="center">.73n </p>
      </td>
      <td>TI-73 real number</td>
    </tr>
    <tr>
      <td width="13%">
      <p align="center">.73p </p>
      </td>
      <td>TI-73 program</td>
    </tr>
    <tr>
      <td width="13%">
      <p align="center">.73q </p>
      </td>
      <td>TI-73 FLASH certificate</td>
    </tr>
    <tr>
      <td width="13%">
      <p align="center">.73t </p>
      </td>
      <td>TI-73 table setup</td>
    </tr>
    <tr>
      <td width="13%">
      <p align="center">.73u </p>
      </td>
      <td>TI-73 FLASH Operating System</td>
    </tr>
    <tr>
      <td width="13%">
      <p align="center">.73w </p>
      </td>
      <td>TI-73 window settings (Window or RclWindow)</td>
    </tr>
    <tr>
      <td width="13%">
      <p align="center">.73y </p>
      </td>
      <td>TI-73 Y-Variable (equation)</td>
    </tr>
    <tr>
      <td width="13%">
      <p align="center">.73z </p>
      </td>
      <td>TI-73 zoom (saved window settings)</td>
    </tr>
  </tbody>
</table>
</p>
<p></p>
<p>
</p>
<hr align="center">
<p></p>
<h3>The TI-73 variable file format</h3>
<p>The TI-73 variable file format has two parts: a header and several
variable entries.</p>
<p>The header appears at the beginning of the file and takes the
following format:<br>
<i>Note - All 2-byte integers are stored little-endian Intel-style
(least significant byte first).</i></p>
<p>
<table border="1" cellspacing="0" width="92%">
  <tbody>
    <tr>
      <th bgcolor="#008800" width="8%"><font color="#ffffff">Offset</font></th>
      <th bgcolor="#008800" width="11%"><font color="#ffffff">Length</font></th>
      <th bgcolor="#008800" width="81%"><font color="#ffffff">Description</font></th>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="8%">0</td>
      <td bgcolor="#ffffff" width="11%">8 bytes</td>
      <td bgcolor="#ffffff" width="81%">8-character signature. The
signature is always "<tt>**TI73**</tt>".</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="8%">8</td>
      <td bgcolor="#ffffff" width="11%">3 bytes</td>
      <td bgcolor="#ffffff" width="81%">3-byte further signature. These
three bytes always contain {1Ah, 0Ah, 00h} = {26, 10, 0}</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="8%">11 (Bh)</td>
      <td bgcolor="#ffffff" width="11%">42&nbsp;(2Ah)&nbsp;bytes</td>
      <td bgcolor="#ffffff" width="81%">Comment. The comment is either
zero-terminated or padded on the right with space characters.</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="8%">53 (35h)</td>
      <td bgcolor="#ffffff" width="11%">2 bytes</td>
      <td bgcolor="#ffffff" width="81%">Length, in bytes, of the data
section of the file. This number should be 55 (37h) bytes less than the
file size.</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="8%">55 (37h)</td>
      <td bgcolor="#ffffff" width="11%"><i>n</i> bytes</td>
      <td bgcolor="#ffffff" width="81%">Data section - consists of a
number of variable entries (described below).</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="8%">55&nbsp;(37h)+<i>n</i></td>
      <td bgcolor="#ffffff" width="11%">2 bytes</td>
      <td bgcolor="#ffffff" width="81%">File checksum. This is the
lower 16 bits of the sum of all bytes in the data section.</td>
    </tr>
  </tbody>
</table>
</p>
<p></p>
<p>Each variable entry follows this format:</p>
<p>
<table border="1" cellspacing="0" width="92%">
  <tbody>
    <tr>
      <th bgcolor="#008800" width="8%"><font color="#ffffff">Offset</font></th>
      <th bgcolor="#008800" width="11%"><font color="#ffffff">Length</font></th>
      <th bgcolor="#008800" width="81%"><font color="#ffffff">Description</font></th>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="8%">0</td>
      <td bgcolor="#ffffff" width="11%">2 bytes</td>
      <td bgcolor="#ffffff" width="81%">Always has a value of 11 (Bh).</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="8%">2</td>
      <td bgcolor="#ffffff" width="11%">2 bytes</td>
      <td bgcolor="#ffffff" width="81%">Length, in bytes, of the
variable data.</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="8%">4</td>
      <td bgcolor="#ffffff" width="11%">1 byte</td>
      <td bgcolor="#ffffff" width="81%">variable type ID byte (see <a
 href="vars.html#vartypes">variable type ID's</a>)</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="8%">5</td>
      <td bgcolor="#ffffff" width="11%">8 bytes</td>
      <td bgcolor="#ffffff" width="81%">Variable name, padded with NULL
characters (0h) on the right.</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="8%">13 (Dh)</td>
      <td bgcolor="#ffffff" width="11%">2 bytes</td>
      <td bgcolor="#ffffff" width="81%">Length, in bytes, of the
variable data. (This is a copy of the value in offset 2)</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="8%">15 (Fh)</td>
      <td bgcolor="#ffffff" width="11%"><i>n</i> bytes</td>
      <td bgcolor="#ffffff" width="81%">Variable data. <a
 href="vars.html">Click here</a> for variable data formats.</td>
    </tr>
  </tbody>
</table>
</p>
<p></p>
<p>
</p>
<hr align="center">
<p></p>
<h3>The TI-73 backup file format</h3>
<p>The TI-Graph Link software for the TI-83 does not have backup
capability. However, the calculator itself does. The following format
is not readable by TI's software.</p>
<p>Here is the format for backup files that TiLP uses (it's the same
format than the TI82/83 one):</p>
<p>
<table border="1" cellspacing="0" width="92%">
  <tbody>
    <tr>
      <th bgcolor="#008800" width="15%"><font color="#ffffff">Offset</font></th>
      <th bgcolor="#008800" width="11%"><font color="#ffffff">Length</font></th>
      <th bgcolor="#008800" width="74%"><font color="#ffffff">Description</font></th>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="15%">0</td>
      <td bgcolor="#ffffff" width="11%">8 bytes</td>
      <td bgcolor="#ffffff" width="74%">8-character signature. The
signature is always "<tt>**TI73**</tt>".</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="15%">8</td>
      <td bgcolor="#ffffff" width="11%">3 bytes</td>
      <td bgcolor="#ffffff" width="74%">3-byte further signature. These
three bytes always contain {1Ah, 0Ah, 00h} = {26, 10, 0}</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="15%">11 (Bh)</td>
      <td bgcolor="#ffffff" width="11%">42&nbsp;(2Ah)&nbsp;bytes</td>
      <td bgcolor="#ffffff" width="74%">Comment. The comment is either
zero-terminated or padded on the right with space characters.</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="15%">53 (35h)</td>
      <td bgcolor="#ffffff" width="11%">2 bytes</td>
      <td bgcolor="#ffffff" width="74%">Length, in bytes, of the backup
header and the data sections. This number should be 17 (11h) bytes more
than the sum of the lengths of the three data sections as reported in
the backup header.</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="15%">55 (37h)</td>
      <td bgcolor="#ffffff" width="11%">11 bytes</td>
      <td bgcolor="#ffffff" width="74%">The backup header (format
described below).</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="15%">66 (42h)</td>
      <td bgcolor="#ffffff" width="11%">2 bytes</td>
      <td bgcolor="#ffffff" width="74%">Length, in bytes, of the first
data section.</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="15%">68&nbsp;(44h)</td>
      <td bgcolor="#ffffff" width="11%"><i>x</i> bytes</td>
      <td bgcolor="#ffffff" width="74%">First data section.</td>
    </tr>
    <tr>
      <td bgcolor="#eeeeee" width="15%">68 (44h)+<i>x</i></td>
      <td bgcolor="#eeeeee" width="11%">2 bytes</td>
      <td bgcolor="#eeeeee" width="74%">Length, in bytes, of the second
data section</td>
    </tr>
    <tr>
      <td bgcolor="#eeeeee" width="15%">70 (46h)+<i>x</i></td>
      <td bgcolor="#eeeeee" width="11%"><i>y</i> bytes</td>
      <td bgcolor="#eeeeee" width="74%">Second data section.</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="15%">70 (46h)+<i>x</i>+<i>y</i></td>
      <td bgcolor="#ffffff" width="11%">2 bytes</td>
      <td bgcolor="#ffffff" width="74%">Length, in bytes, of the third
data section</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="15%">72 (48h)+<i>x</i>+<i>y</i></td>
      <td bgcolor="#ffffff" width="11%"><i>z</i> bytes</td>
      <td bgcolor="#ffffff" width="74%">Third data section</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="15%">72 (48h)+<i>x</i>+<i>y</i>+<i>z</i></td>
      <td bgcolor="#ffffff" width="11%">2 bytes</td>
      <td bgcolor="#ffffff" width="74%">Checksum. This is the lower 16
bits of the sum of all bytes from offset 55 (37h).</td>
    </tr>
  </tbody>
</table>
</p>
<p></p>
<p>The backup header has this format:</p>
<p>
<table border="1" cellspacing="0" width="92%">
  <tbody>
    <tr>
      <th bgcolor="#008800" width="8%"><font color="#ffffff">Offset</font></th>
      <th bgcolor="#008800" width="11%"><font color="#ffffff">Length</font></th>
      <th bgcolor="#008800" width="81%"><font color="#ffffff">Description</font></th>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="8%">0</td>
      <td bgcolor="#ffffff" width="11%">2 bytes</td>
      <td bgcolor="#ffffff" width="81%">Offset to data length: Always
has a value of 9.</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="8%">2</td>
      <td bgcolor="#ffffff" width="11%">2 bytes</td>
      <td bgcolor="#ffffff" width="81%">Length, in bytes, of the first
data section.</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="8%">4</td>
      <td bgcolor="#ffffff" width="11%">1&nbsp;byte</td>
      <td bgcolor="#ffffff" width="81%">Type ID: Always has a value of
19 (13h).</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="8%">5</td>
      <td bgcolor="#ffffff" width="11%">2 bytes</td>
      <td bgcolor="#ffffff" width="81%">Length, in bytes, of the second
data section.</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="8%">7</td>
      <td bgcolor="#ffffff" width="11%">2 bytes</td>
      <td bgcolor="#ffffff" width="81%">Length, in bytes, of the third
data section.</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="8%">9</td>
      <td bgcolor="#ffffff" width="11%">2 bytes</td>
      <td bgcolor="#ffffff" width="81%">Memory address</td>
    </tr>
  </tbody>
</table>
</p>
<h3>
<hr align="center"> The TI-73 FLASH file format</h3>
<p>It's the same as the TI83+ FLASH file format. You will find it <a
 href="../ti83+/fformat.html">here</a>.<br>
</p>
<p>&nbsp;
<br>
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<hr align="center"><i>Site maintained by Romain Li&eacute;vin (</i><a
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