noah
/
tibasicc


			
				
					
						
						
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							<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<html>
<head>
  <meta name="GENERATOR" content="Visual Page 1.0 for Windows">
  <meta http-equiv="Content-Type" content="text/html;CHARSET=iso-8859-1">
  <title>TI-73 Link Protocol Guide - Silent Transfers</title>
</head>
<body bgcolor="#ffffe8">
<p><b>TI-73 Link Protocol Guide v1.0</b> - Silent Variable Transfers</p>
<center>
<h2>
<hr align="center">Silent Variable Transfers</h2>
</center>
<p>"Silent Linking" is a capability that Texas Instruments built into
the TI-83, TI-73, TI-86, TI-89,
TI-92 and TI-92+. It enables the calculator to transfer data to and
from a computer without any special preparation
required on the calculator end. The only drawback to the silent linking
method is that when using this protocol,
the calculator will automatically overwrite any data in a variable that
has the same name as one being sent to
it. Any program that incorporates silent linking must check for this;
otherwise data may be lost.</p>
<p>Because silent linking protocols are one-sided (i.e. the user
interaction is solely on the computer), there
are three different transfer sequences required. First a <a href="#dir">directory
listing</a> must be downloaded
from the calculator in order to choose the variables to transfer or to
check for duplicate names and out-of-memory
conditions. Then, if variables are to be downloaded, a <a
 href="#request">variable request</a> action must be initiated
by the computer. Finally, if variables are to be uploaded, a <a
 href="#rts">request-to-send</a> action must be
sent by the computer.</p>
<h4><a name="dir"></a>Directory Listing</h4>
<p>A directory listing is a list of all user variables in the
calculator's memory and a number specifying how many
bytes of free memory are left.</p>
<p>The protocol for requesting a directory listing is shown below. For
information on packet formats, <a href="packet.html">click
here</a>.</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="9">
      <p align="center"><img src="graphics/comp.gif" alt="Computer"
 align="bottom" border="0" height="33" width="30"> </p>
      </td>
      <td bgcolor="#ffffff">
      <p align="center"><img src="graphics/right.gif" alt="===&gt;"
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td rowspan="9">
      <p align="center"><img src="graphics/calc.gif" alt="Calculator"
 align="bottom" border="0" height="67" width="30"> </p>
      </td>
      <td bgcolor="#ffffff" width="80%">REQ with data type=0x19 (see <a
 href="packet.html#15h">note under Type ID's</a> for variable header
format)</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="7%">
      <p align="center">2 </p>
      </td>
      <td bgcolor="#ffffff">
      <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">
      <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%">DATA: 2-byte free memory count <i>(little-endian)</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="7%">
      <p align="center">4 </p>
      </td>
      <td bgcolor="#ffffff">
      <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%">&nbsp;</td>
      <td>&nbsp;</td>
      <td width="80%"><i> (Repeat steps 5 and 6 for all user variables
in the calculator's memory)</i></td>
    </tr>
    <tr>
      <td width="7%">
      <p align="center">5 </p>
      </td>
      <td>
      <p align="center"><img src="graphics/left.gif" alt="&lt;==="
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td width="80%">VAR (with padded variable header) - one entry</td>
    </tr>
    <tr>
      <td width="7%">
      <p align="center">6 </p>
      </td>
      <td>
      <p align="center"><img src="graphics/right.gif" alt="===&gt;"
 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>
      <p align="center"><img src="graphics/left.gif" alt="&lt;==="
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td width="80%">EOT</td>
    </tr>
    <tr>
      <td width="7%">
      <p align="center">8 </p>
      </td>
      <td>
      <p align="center"><img src="graphics/right.gif" alt="===&gt;"
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td width="80%">ACK</td>
    </tr>
  </tbody>
</table>
</p>
<p></p>
<p><u>Example:<br>
</u>
<table bgcolor="#ffffff" border="0" cellspacing="0" width="100%">
  <tbody>
    <tr>
      <td bgcolor="#ccffcc">PC:</td>
      <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;A2&nbsp;0B&nbsp;00&nbsp;</tt></b><tt>00&nbsp;00&nbsp;19&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;<b>19&nbsp;00</b></tt></td>
      <td bgcolor="#ccffcc" width="50%"><i>Directory request</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">TI:</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
      <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of request</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">&nbsp;</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;15&nbsp;02&nbsp;00&nbsp;</tt></b><tt>66&nbsp;5B&nbsp;<b>C1
00</b></tt></td>
      <td bgcolor="#ffcccc" width="50%"><i>Data: 23398 (5B66h) bytes of
free memory</i></td>
    </tr>
    <tr>
      <td bgcolor="#ccffcc">PC:</td>
      <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
      <td bgcolor="#ccffcc" width="50%"><i>Acknowledgement of data</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">TI:</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;06&nbsp;0B&nbsp;00&nbsp;</tt></b><tt>09&nbsp;00&nbsp;00&nbsp;41&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;<b>4A&nbsp;00</b></tt></td>
      <td bgcolor="#ffcccc" width="50%"><i>Variable Header: Real Number
"A"</i></td>
    </tr>
    <tr>
      <td bgcolor="#ccffcc">PC:</td>
      <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
      <td bgcolor="#ccffcc" width="50%"><i>Acknowledgement of variable
header</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">TI:</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;06&nbsp;0B&nbsp;00&nbsp;</tt></b><tt>09&nbsp;00&nbsp;00&nbsp;42&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;<b>CB&nbsp;00</b></tt></td>
      <td bgcolor="#ffcccc" width="50%"><i>Variable Header: Real Number
"B" which is archived</i></td>
    </tr>
    <tr>
      <td bgcolor="#ccffcc">PC:</td>
      <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
      <td bgcolor="#ccffcc" width="50%"><i>Acknowledgement of variable
header</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">TI:</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;92&nbsp;00&nbsp;00</tt></b></td>
      <td bgcolor="#ffcccc" width="50%"><i>No more variables</i></td>
    </tr>
    <tr>
      <td bgcolor="#ccffcc">PC:</td>
      <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
      <td bgcolor="#ccffcc" width="50%"><i>Acknowledgement of EOT</i></td>
    </tr>
  </tbody>
</table>
</p>
<p></p>
<h4><a name="request"></a>Requesting a Variable</h4>
<p>The protocol for requesting and receiving a variable from the
calculator is shown below.</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="8">
      <p align="center"><img src="graphics/comp.gif" alt="Computer"
 align="bottom" border="0" height="33" width="30"> </p>
      </td>
      <td bgcolor="#ffffff">
      <p align="center"><img src="graphics/right.gif" alt="===&gt;"
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td rowspan="8">
      <p align="center"><img src="graphics/calc.gif" alt="Calculator"
 align="bottom" border="0" height="67" width="30"> </p>
      </td>
      <td bgcolor="#ffffff" width="80%">REQ with expected header</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="7%">
      <p align="center">2 </p>
      </td>
      <td bgcolor="#ffffff">
      <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 (see note below)</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="7%">
      <p align="center">3 </p>
      </td>
      <td bgcolor="#ffffff">
      <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%">VAR with actual header</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="7%">
      <p align="center">4 </p>
      </td>
      <td bgcolor="#ffffff">
      <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>
      <p align="center"><img src="graphics/right.gif" alt="===&gt;"
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td width="80%">CTS</td>
    </tr>
    <tr>
      <td width="7%">
      <p align="center">6 </p>
      </td>
      <td>
      <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>
      <p align="center"><img src="graphics/left.gif" alt="&lt;==="
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td width="80%">DATA</td>
    </tr>
    <tr>
      <td width="7%">
      <p align="center">8 </p>
      </td>
      <td>
      <p align="center"><img src="graphics/right.gif" alt="===&gt;"
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td width="80%">ACK</td>
    </tr>
  </tbody>
</table>
<i>Note: If the requested variable does not exist, the calculator will
send an EXIT packet after step 2, to which
the computer will respond with an ACK packet. This would be the end of
the transfer.</i></p>
<p></p>
<p>As with manual transfers, the data section contains the variable
data. For information on variable formats,
<a href="vars.html">click here</a>.</p>
<p><u>Example:</u>
<table border="0" cellspacing="0" width="100%">
  <tbody>
    <tr>
      <td bgcolor="#ccffcc">PC:</td>
      <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;A2&nbsp;0B&nbsp;00&nbsp;</tt></b><tt>00
00 01 5D 01 00 00 00 00 00 00 <b>4A&nbsp;00</b></tt></td>
      <td bgcolor="#ccffcc" width="50%"><i>Request List "L1"</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">TI:</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
      <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of request</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">&nbsp;</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;06&nbsp;0B&nbsp;00
      </tt></b><tt>02 00 01 5D 01 00 00 00 00 00 00 <b>61 00</b></tt></td>
      <td bgcolor="#ffcccc" width="50%"><i>Variable Header: List "L1"</i></td>
    </tr>
    <tr>
      <td bgcolor="#ccffcc">PC:</td>
      <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
      <td bgcolor="#ccffcc" width="50%"><i>Acknowledgement of variable
header</i></td>
    </tr>
    <tr>
      <td bgcolor="#ccffcc">&nbsp;</td>
      <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;09&nbsp;00&nbsp;00</tt></b></td>
      <td bgcolor="#ccffcc" width="50%">Clear to send variable</td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">TI:</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
      <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of CTS</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">&nbsp;</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;15&nbsp;02
00&nbsp;</tt></b><tt>00 00 <b>00 00</b></tt></td>
      <td bgcolor="#ffcccc" width="50%"><i>Variable data</i></td>
    </tr>
    <tr>
      <td bgcolor="#ccffcc">PC:</td>
      <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
      <td bgcolor="#ccffcc" width="50%"><i>Acknowledgement of variable
data</i></td>
    </tr>
  </tbody>
</table>
</p>
<p></p>
<h4><a name="rts"></a>Sending a Variable</h4>
<p>The protocol for sending a variable to the calculator is shown below.</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="6">
      <p align="center"><img src="graphics/comp.gif" alt="Computer"
 align="bottom" border="0" height="33" width="30"> </p>
      </td>
      <td bgcolor="#ffffff">
      <p align="center"><img src="graphics/right.gif" alt="===&gt;"
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td rowspan="6">
      <p align="center"><img src="graphics/calc.gif" alt="Calculator"
 align="bottom" border="0" height="67" width="30"> </p>
      </td>
      <td bgcolor="#ffffff" width="80%">RTS</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="7%">
      <p align="center">2 </p>
      </td>
      <td bgcolor="#ffffff">
      <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">
      <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 (see note
below)</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="7%">
      <p align="center">4 </p>
      </td>
      <td bgcolor="#ffffff">
      <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>
      <p align="center"><img src="graphics/right.gif" alt="===&gt;"
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td width="80%">DATA</td>
    </tr>
    <tr>
      <td width="7%">
      <p align="center">6 </p>
      </td>
      <td>
      <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>Note: If the calculator sends a SKIP/EXIT packet in step 3, it does
not have enough free memory to accomodate
the variable. In this case, step 4 will be the end of the transfer.</i></p>
<p></p>
<p>Again, the data section contains the variable data.</p>
<p><u>Examples:<br>
</u>
<table border="0" cellspacing="0" width="100%">
  <tbody>
    <tr>
      <td bgcolor="#ccffcc">PC:</td>
      <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;C9&nbsp;0B&nbsp;00
      </tt></b><tt>02 00 01 5D 01 00 00 00 00 00 00 <b>61 00</b></tt></td>
      <td bgcolor="#ccffcc" width="50%"><i>Request to send List "L1"</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">TI:</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
      <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of request</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">&nbsp;</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;09&nbsp;00&nbsp;00</tt></b></td>
      <td bgcolor="#ffcccc" width="50%"><i>Clear to send variable</i></td>
    </tr>
    <tr>
      <td bgcolor="#ccffcc">PC:</td>
      <td bgcolor="#ccffcc" width="50%"><b><tt>07&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>07&nbsp;15&nbsp;02
00&nbsp;</tt></b><tt>00 00 <b>00 00</b></tt></td>
      <td bgcolor="#ccffcc" width="50%"><i>Variable data</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">TI:</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
      <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of data</i></td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td width="50%">&nbsp;</td>
      <td width="50%">&nbsp;</td>
    </tr>
    <tr>
      <td bgcolor="#ccffcc">PC:</td>
      <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;C9&nbsp;0B&nbsp;00&nbsp;</tt></b><tt>09&nbsp;00&nbsp;00&nbsp;42&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;<b>4B&nbsp;00</b></tt></td>
      <td bgcolor="#ccffcc" width="50%"><i>Request to send Real Number
"B"</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">TI:</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
      <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of request</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">&nbsp;</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;36&nbsp;01&nbsp;00&nbsp;</tt></b><tt>03&nbsp;<b>03&nbsp;00</b></tt></td>
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      <td bgcolor="#ccffcc">PC:</td>
      <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
      <td bgcolor="#ccffcc" width="50%"><i>Acknowledgement of out of
memory</i></td>
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