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  1. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
    2. 

  2. <html>
    3. 

  3. <head>
    4. 

  4.   <meta name="GENERATOR" content="Visual Page 1.0 for Windows">
    5. 

  5.   <meta http-equiv="Content-Type" content="text/html;CHARSET=iso-8859-1">
    6. 

  6.   <title>TI-83 Link Protocol Guide - Backup Transfers</title>
    7. 

  7. </head>
    8. 

  8. <body bgcolor="#ffffe8">
    9. 

  9. <p><b>TI-73 Link Protocol Guide</b> - System Backup Transfers</p>
    10. 

  10. <center>
    11. 

  11. <h2>
    12. 

  12. <hr align="center">System Backup Transfers</h2>
    13. 

  13. </center>
    14. 

  14. <p>A System Backup is one large transmission containing all
    15. 

  15. user-modifiable data in the calculator. The file format
    16. 

  16. that the TI-83 Graph Link software uses can be found in the <a
    17. 

  17.  href="fformat.html#backup">file formats</a> section
    18. 

  18. of this documentation.</p>
    19. 

  19. <p>System backups can either be transferred manually or silently.
    20. 

  20. Manual transfers require both the sending and
    21. 

  21. the receiving units to be put into a special transfer mode. Silent
    22. 

  22. transfers can only be done between a computer
    23. 

  23. and a calculator, and require that the computer make the <a
    24. 

  24.  href="#request">request</a> or <a href="#rts">request-to-send</a>.</p>
    25. 

  25. <p>The protocol for manual system backup transfers is shown below. For
    26. 

  26. information on packet formats, <a href="packet.html">click
    27. 

  27. here</a>.</p>
    28. 

  28. <p>A computer can be either the sending unit or the receiving unit.</p>
    29. 

  29. <p>
    30. 

  30. <table bgcolor="#ffffff" border="1" cellspacing="0" width="92%">
    31. 

  31.   <tbody>
    32. 

  32.     <tr>
    33. 

  33.       <th bgcolor="#008800" width="7%"><font color="#ffffff">Step</font></th>
    34. 

  34.       <th colspan="3" bgcolor="#008800"><font color="#ffffff">Direction</font></th>
    35. 

  35.       <th bgcolor="#008800" width="80%"><font color="#ffffff">Packet</font></th>
    36. 

  36.     </tr>
    37. 

  37.     <tr>
    38. 

  38.       <td bgcolor="#ffffff" width="7%">
    39. 

  39.       <p align="center">1 </p>
    40. 

  40.       </td>
    41. 

  41.       <td rowspan="10">
    42. 

  42.       <p align="center"><img src="graphics/calc.gif" alt="Sending Unit"
    43. 

  43.  align="bottom" border="0" height="67" width="30"> </p>
    44. 

  44.       </td>
    45. 

  45.       <td bgcolor="#ffffff" width="6%">
    46. 

  46.       <p align="center"><img src="graphics/right.gif" alt="===&gt;"
    47. 

  47.  align="bottom" border="0" height="13" width="22"> </p>
    48. 

  48.       </td>
    49. 

  49.       <td rowspan="10">
    50. 

  50.       <p align="center"><img src="graphics/calc.gif"
    51. 

  51.  alt="Receiving Unit" align="bottom" border="0" height="67" width="30">
    52. 

  52.       </p>
    53. 

  53.       </td>
    54. 

  54.       <td bgcolor="#ffffff" width="80%">VAR with <a
    55. 

  55.  href="packet.html#backup">backup-style header</a> and type ID = 13h.</td>
    56. 

  56.     </tr>
    57. 

  57.     <tr>
    58. 

  58.       <td bgcolor="#ffffff" width="7%">
    59. 

  59.       <p align="center">2 </p>
    60. 

  60.       </td>
    61. 

  61.       <td bgcolor="#ffffff" width="6%">
    62. 

  62.       <p align="center"><img src="graphics/left.gif" alt="&lt;==="
    63. 

  63.  align="bottom" border="0" height="13" width="22"> </p>
    64. 

  64.       </td>
    65. 

  65.       <td bgcolor="#ffffff" width="80%">ACK</td>
    66. 

  66.     </tr>
    67. 

  67.     <tr>
    68. 

  68.       <td bgcolor="#ffffff" width="7%">
    69. 

  69.       <p align="center">3 </p>
    70. 

  70.       </td>
    71. 

  71.       <td bgcolor="#ffffff" width="6%">
    72. 

  72.       <p align="center"><img src="graphics/left.gif" alt="&lt;==="
    73. 

  73.  align="bottom" border="0" height="13" width="22"> </p>
    74. 

  74.       </td>
    75. 

  75.       <td bgcolor="#ffffff" width="80%">CTS or SKIP/EXIT. If exit, do
    76. 

  76. step 4 and quit.</td>
    77. 

  77.     </tr>
    78. 

  78.     <tr>
    79. 

  79.       <td bgcolor="#ffffff" width="7%">
    80. 

  80.       <p align="center">4 </p>
    81. 

  81.       </td>
    82. 

  82.       <td bgcolor="#ffffff" width="6%">
    83. 

  83.       <p align="center"><img src="graphics/right.gif" alt="===&gt;"
    84. 

  84.  align="bottom" border="0" height="13" width="22"> </p>
    85. 

  85.       </td>
    86. 

  86.       <td bgcolor="#ffffff" width="80%">ACK</td>
    87. 

  87.     </tr>
    88. 

  88.     <tr>
    89. 

  89.       <td width="7%">
    90. 

  90.       <p align="center">5 </p>
    91. 

  91.       </td>
    92. 

  92.       <td width="6%">
    93. 

  93.       <p align="center"><img src="graphics/right.gif" alt="===&gt;"
    94. 

  94.  align="bottom" border="0" height="13" width="22"> </p>
    95. 

  95.       </td>
    96. 

  96.       <td width="80%">DATA - section 1 (system data)</td>
    97. 

  97.     </tr>
    98. 

  98.     <tr>
    99. 

  99.       <td width="7%">
    100. 

  100.       <p align="center">6 </p>
    101. 

  101.       </td>
    102. 

  102.       <td width="6%">
    103. 

  103.       <p align="center"><img src="graphics/left.gif" alt="&lt;==="
    104. 

  104.  align="bottom" border="0" height="13" width="22"> </p>
    105. 

  105.       </td>
    106. 

  106.       <td width="80%">ACK</td>
    107. 

  107.     </tr>
    108. 

  108.     <tr>
    109. 

  109.       <td width="7%">
    110. 

  110.       <p align="center">7 </p>
    111. 

  111.       </td>
    112. 

  112.       <td width="6%">
    113. 

  113.       <p align="center"><img src="graphics/right.gif" alt="===&gt;"
    114. 

  114.  align="bottom" border="0" height="13" width="22"> </p>
    115. 

  115.       </td>
    116. 

  116.       <td width="80%">DATA - section 2 (user data)</td>
    117. 

  117.     </tr>
    118. 

  118.     <tr>
    119. 

  119.       <td width="7%">
    120. 

  120.       <p align="center">8 </p>
    121. 

  121.       </td>
    122. 

  122.       <td width="6%">
    123. 

  123.       <p align="center"><img src="graphics/left.gif" alt="&lt;==="
    124. 

  124.  align="bottom" border="0" height="13" width="22"> </p>
    125. 

  125.       </td>
    126. 

  126.       <td width="80%">ACK</td>
    127. 

  127.     </tr>
    128. 

  128.     <tr>
    129. 

  129.       <td width="7%">
    130. 

  130.       <p align="center">9 </p>
    131. 

  131.       </td>
    132. 

  132.       <td width="6%">
    133. 

  133.       <p align="center"><img src="graphics/right.gif" alt="===&gt;"
    134. 

  134.  align="bottom" border="0" height="13" width="22"> </p>
    135. 

  135.       </td>
    136. 

  136.       <td width="80%">DATA - section 3 (variable table?)</td>
    137. 

  137.     </tr>
    138. 

  138.     <tr>
    139. 

  139.       <td width="7%">
    140. 

  140.       <p align="center">10 </p>
    141. 

  141.       </td>
    142. 

  142.       <td width="6%">
    143. 

  143.       <p align="center"><img src="graphics/left.gif" alt="&lt;==="
    144. 

  144.  align="bottom" border="0" height="13" width="22"> </p>
    145. 

  145.       </td>
    146. 

  146.       <td width="80%">ACK</td>
    147. 

  147.     </tr>
    148. 

  148.   </tbody>
    149. 

  149. </table>
    150. 

  150. </p>
    151. 

  151. <p></p>
    152. 

  152. <p><u>Example (PC sending backup to TI):</u><br>
    153. 

  153. <table border="0" cellspacing="0" width="100%">
    154. 

  154.   <tbody>
    155. 

  155.     <tr>
    156. 

  156.       <td bgcolor="#ccffcc">PC:</td>
    157. 

  157.       <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;06&nbsp;09&nbsp;00&nbsp;</tt></b><tt>A5&nbsp;13&nbsp;13&nbsp;60&nbsp;00&nbsp;75&nbsp;01&nbsp;95&nbsp;9D&nbsp;<b>75&nbsp;02</b></tt></td>
    158. 

  158.       <td bgcolor="#ccffcc" width="50%"><i>Variable header: Backup</i></td>
    159. 

  159.     </tr>
    160. 

  160.     <tr>
    161. 

  161.       <td bgcolor="#ffcccc">TI:</td>
    162. 

  162.       <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
    163. 

  163.       <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of header</i></td>
    164. 

  164.     </tr>
    165. 

  165.     <tr>
    166. 

  166.       <td bgcolor="#ffcccc">&nbsp;</td>
    167. 

  167.       <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;09&nbsp;00&nbsp;00</tt></b></td>
    168. 

  168.       <td bgcolor="#ffcccc" width="50%"><i>Clear to send backup</i></td>
    169. 

  169.     </tr>
    170. 

  170.     <tr>
    171. 

  171.       <td bgcolor="#ccffcc">PC:</td>
    172. 

  172.       <td bgcolor="#ccffcc" width="50%"><b><tt>74&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
    173. 

  173.       <td bgcolor="#ccffcc" width="50%"><i>Acknowledgement of CTS</i></td>
    174. 

  174.     </tr>
    175. 

  175.     <tr>
    176. 

  176.       <td bgcolor="#ccffcc">&nbsp;</td>
    177. 

  177.       <td bgcolor="#ccffcc" width="50%"><b><tt>74&nbsp;15&nbsp;A5&nbsp;13&nbsp;</tt></b>&lt;13A5h&nbsp;bytes&nbsp;of&nbsp;data&nbsp;plus&nbsp;checksum&gt;</td>
    178. 

  178.       <td bgcolor="#ccffcc" width="50%"><i>Backup data section 1
    179. 

  179. (system data)</i></td>
    180. 

  180.     </tr>
    181. 

  181.     <tr>
    182. 

  182.       <td bgcolor="#ffcccc">TI:</td>
    183. 

  183.       <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
    184. 

  184.       <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of data</i></td>
    185. 

  185.     </tr>
    186. 

  186.     <tr>
    187. 

  187.       <td bgcolor="#ccffcc">PC:</td>
    188. 

  188.       <td bgcolor="#ccffcc" width="50%"><b><tt>74&nbsp;15&nbsp;60&nbsp;00&nbsp;</tt></b>&lt;60h&nbsp;bytes&nbsp;of&nbsp;data&nbsp;plus&nbsp;checksum&gt;</td>
    189. 

  189.       <td bgcolor="#ccffcc" width="50%"><i>Backup data section 2 (user
    190. 

  190. data)</i></td>
    191. 

  191.     </tr>
    192. 

  192.     <tr>
    193. 

  193.       <td bgcolor="#ffcccc">TI:</td>
    194. 

  194.       <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
    195. 

  195.       <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of data</i></td>
    196. 

  196.     </tr>
    197. 

  197.     <tr>
    198. 

  198.       <td bgcolor="#ccffcc">PC:</td>
    199. 

  199.       <td bgcolor="#ccffcc" width="50%"><b><tt>74&nbsp;15&nbsp;75&nbsp;01&nbsp;</tt></b>&lt;175h&nbsp;bytes&nbsp;of&nbsp;data&nbsp;plus&nbsp;checksum&gt;</td>
    200. 

  200.       <td bgcolor="#ccffcc" width="50%"><i>Backup data section 3
    201. 

  201. (variable table?)</i></td>
    202. 

  202.     </tr>
    203. 

  203.     <tr>
    204. 

  204.       <td bgcolor="#ffcccc">TI:</td>
    205. 

  205.       <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
    206. 

  206.       <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of data</i></td>
    207. 

  207.     </tr>
    208. 

  208.   </tbody>
    209. 

  209. </table>
    210. 

  210. </p>
    211. 

  211. <p></p>
    212. 

  212. <h3>
    213. 

  213. <hr align="center">Silent Backup Transfers</h3>
    214. 

  214. <p><a name="request"></a>The protocol for silently requesting and
    215. 

  215. receiving a backup is described below:</p>
    216. 

  216. <p>
    217. 

  217. <table bgcolor="#ffffff" border="1" cellspacing="0" width="92%">
    218. 

  218.   <tbody>
    219. 

  219.     <tr>
    220. 

  220.       <th bgcolor="#008800" width="7%"><font color="#ffffff">Step</font></th>
    221. 

  221.       <th colspan="3" bgcolor="#008800"><font color="#ffffff">Direction</font></th>
    222. 

  222.       <th bgcolor="#008800" width="80%"><font color="#ffffff">Packet</font></th>
    223. 

  223.     </tr>
    224. 

  224.     <tr>
    225. 

  225.       <td bgcolor="#ffffff" width="7%">
    226. 

  226.       <p align="center">1 </p>
    227. 

  227.       </td>
    228. 

  228.       <td rowspan="12">
    229. 

  229.       <p align="center"><img src="graphics/comp.gif" alt="Computer"
    230. 

  230.  align="bottom" border="0" height="33" width="30"> </p>
    231. 

  231.       </td>
    232. 

  232.       <td width="6%">
    233. 

  233.       <p align="center"><img src="graphics/right.gif" alt="===&gt;"
    234. 

  234.  align="bottom" border="0" height="13" width="22"> </p>
    235. 

  235.       </td>
    236. 

  236.       <td rowspan="12">
    237. 

  237.       <p align="center"><img src="graphics/calc.gif" alt="Calculator"
    238. 

  238.  align="bottom" border="0" height="67" width="30"> </p>
    239. 

  239.       </td>
    240. 

  240.       <td width="80%">REQ with 11-byte variable header and type ID =
    241. 

  241. 13h (all other fields contain 0h bytes).</td>
    242. 

  242.     </tr>
    243. 

  243.     <tr>
    244. 

  244.       <td bgcolor="#ffffff" width="7%">
    245. 

  245.       <p align="center">2 </p>
    246. 

  246.       </td>
    247. 

  247.       <td width="6%">
    248. 

  248.       <p align="center"><img src="graphics/left.gif" alt="&lt;==="
    249. 

  249.  align="bottom" border="0" height="13" width="22"> </p>
    250. 

  250.       </td>
    251. 

  251.       <td width="80%">ACK</td>
    252. 

  252.     </tr>
    253. 

  253.     <tr>
    254. 

  254.       <td bgcolor="#ffffff" width="7%">
    255. 

  255.       <p align="center">3 </p>
    256. 

  256.       </td>
    257. 

  257.       <td bgcolor="#ffffff" width="6%">
    258. 

  258.       <p align="center"><img src="graphics/left.gif" alt="&lt;==="
    259. 

  259.  align="bottom" border="0" height="13" width="22"> </p>
    260. 

  260.       </td>
    261. 

  261.       <td bgcolor="#ffffff" width="80%">VAR with <a
    262. 

  262.  href="packet.html#backup">backup-style header</a> and type ID = 13h.</td>
    263. 

  263.     </tr>
    264. 

  264.     <tr>
    265. 

  265.       <td bgcolor="#ffffff" width="7%">
    266. 

  266.       <p align="center">4 </p>
    267. 

  267.       </td>
    268. 

  268.       <td bgcolor="#ffffff" width="6%">
    269. 

  269.       <p align="center"><img src="graphics/right.gif" alt="===&gt;"
    270. 

  270.  align="bottom" border="0" height="13" width="22"> </p>
    271. 

  271.       </td>
    272. 

  272.       <td bgcolor="#ffffff" width="80%">ACK</td>
    273. 

  273.     </tr>
    274. 

  274.     <tr>
    275. 

  275.       <td width="7%">
    276. 

  276.       <p align="center">5 </p>
    277. 

  277.       </td>
    278. 

  278.       <td bgcolor="#ffffff" width="6%">
    279. 

  279.       <p align="center"><img src="graphics/right.gif" alt="===&gt;"
    280. 

  280.  align="bottom" border="0" height="13" width="22"> </p>
    281. 

  281.       </td>
    282. 

  282.       <td bgcolor="#ffffff" width="80%">CTS or SKIP/EXIT. If exit, do
    283. 

  283. step 4 and quit.</td>
    284. 

  284.     </tr>
    285. 

  285.     <tr>
    286. 

  286.       <td width="7%">
    287. 

  287.       <p align="center">6 </p>
    288. 

  288.       </td>
    289. 

  289.       <td bgcolor="#ffffff" width="6%">
    290. 

  290.       <p align="center"><img src="graphics/left.gif" alt="&lt;==="
    291. 

  291.  align="bottom" border="0" height="13" width="22"> </p>
    292. 

  292.       </td>
    293. 

  293.       <td bgcolor="#ffffff" width="80%">ACK</td>
    294. 

  294.     </tr>
    295. 

  295.     <tr>
    296. 

  296.       <td width="7%">
    297. 

  297.       <p align="center">7 </p>
    298. 

  298.       </td>
    299. 

  299.       <td width="6%">
    300. 

  300.       <p align="center"><img src="graphics/left.gif" alt="&lt;==="
    301. 

  301.  align="bottom" border="0" height="13" width="22"> </p>
    302. 

  302.       </td>
    303. 

  303.       <td width="80%">DATA - section 1 (system data)</td>
    304. 

  304.     </tr>
    305. 

  305.     <tr>
    306. 

  306.       <td width="7%">
    307. 

  307.       <p align="center">8 </p>
    308. 

  308.       </td>
    309. 

  309.       <td width="6%">
    310. 

  310.       <p align="center"><img src="graphics/right.gif" alt="===&gt;"
    311. 

  311.  align="bottom" border="0" height="13" width="22"> </p>
    312. 

  312.       </td>
    313. 

  313.       <td width="80%">ACK</td>
    314. 

  314.     </tr>
    315. 

  315.     <tr>
    316. 

  316.       <td width="7%">
    317. 

  317.       <p align="center">9 </p>
    318. 

  318.       </td>
    319. 

  319.       <td width="6%">
    320. 

  320.       <p align="center"><img src="graphics/left.gif" alt="&lt;==="
    321. 

  321.  align="bottom" border="0" height="13" width="22"> </p>
    322. 

  322.       </td>
    323. 

  323.       <td width="80%">DATA - section 2 (user data)</td>
    324. 

  324.     </tr>
    325. 

  325.     <tr>
    326. 

  326.       <td width="7%">
    327. 

  327.       <p align="center">10 </p>
    328. 

  328.       </td>
    329. 

  329.       <td width="6%">
    330. 

  330.       <p align="center"><img src="graphics/right.gif" alt="===&gt;"
    331. 

  331.  align="bottom" border="0" height="13" width="22"> </p>
    332. 

  332.       </td>
    333. 

  333.       <td width="80%">ACK</td>
    334. 

  334.     </tr>
    335. 

  335.     <tr>
    336. 

  336.       <td width="7%">
    337. 

  337.       <p align="center">&nbsp; </p>
    338. 

  338.       </td>
    339. 

  339.       <td width="6%">
    340. 

  340.       <p align="center"><img src="graphics/left.gif" alt="&lt;==="
    341. 

  341.  align="bottom" border="0" height="13" width="22"> </p>
    342. 

  342.       </td>
    343. 

  343.       <td width="80%">DATA - section 3 (variable table?)</td>
    344. 

  344.     </tr>
    345. 

  345.     <tr>
    346. 

  346.       <td width="7%">
    347. 

  347.       <p align="center">&nbsp; </p>
    348. 

  348.       </td>
    349. 

  349.       <td width="6%">
    350. 

  350.       <p align="center"><img src="graphics/right.gif" alt="===&gt;"
    351. 

  351.  align="bottom" border="0" height="13" width="22"> </p>
    352. 

  352.       </td>
    353. 

  353.       <td width="80%">ACK</td>
    354. 

  354.     </tr>
    355. 

  355.   </tbody>
    356. 

  356. </table>
    357. 

  357. </p>
    358. 

  358. <p></p>
    359. 

  359. <p><u>Example:</u><br>
    360. 

  360. <table border="0" cellspacing="0" width="100%">
    361. 

  361.   <tbody>
    362. 

  362.     <tr>
    363. 

  363.       <td bgcolor="#ccffcc">PC:</td>
    364. 

  364.       <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;A2&nbsp;0B
    365. 

  365. 00&nbsp;</tt></b><tt>00&nbsp;00&nbsp;13&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;00
    366. 

  366. 00&nbsp;00&nbsp;00&nbsp;<b>13&nbsp;00</b></tt></td>
    367. 

  367.       <td bgcolor="#ccffcc" width="50%"><i>Request backup</i></td>
    368. 

  368.     </tr>
    369. 

  369.     <tr>
    370. 

  370.       <td bgcolor="#ffcccc">TI:</td>
    371. 

  371.       <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
    372. 

  372.       <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of request</i></td>
    373. 

  373.     </tr>
    374. 

  374.     <tr>
    375. 

  375.       <td bgcolor="#ffcccc">&nbsp;</td>
    376. 

  376.       <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;06&nbsp;09&nbsp;00
    377. 

  377.       </tt></b><tt>DC 16 13 35 00 71 00 37 9C <b>7E 02</b></tt></td>
    378. 

  378.       <td bgcolor="#ffcccc" width="50%"><i>Variable header: Backup</i></td>
    379. 

  379.     </tr>
    380. 

  380.     <tr>
    381. 

  381.       <td bgcolor="#ccffcc">PC:</td>
    382. 

  382.       <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
    383. 

  383.       <td bgcolor="#ccffcc" width="50%"><i>Acknowledgement of header</i></td>
    384. 

  384.     </tr>
    385. 

  385.     <tr>
    386. 

  386.       <td bgcolor="#ccffcc">&nbsp;</td>
    387. 

  387.       <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;09&nbsp;00&nbsp;00</tt></b></td>
    388. 

  388.       <td bgcolor="#ccffcc" width="50%"><i>Clear to send backup</i></td>
    389. 

  389.     </tr>
    390. 

  390.     <tr>
    391. 

  391.       <td bgcolor="#ffcccc">TI:</td>
    392. 

  392.       <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
    393. 

  393.       <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of CTS</i></td>
    394. 

  394.     </tr>
    395. 

  395.     <tr>
    396. 

  396.       <td bgcolor="#ffcccc">&nbsp;</td>
    397. 

  397.       <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;15 DC 16 </tt></b>&lt;16DCh&nbsp;bytes&nbsp;of&nbsp;data&nbsp;plus&nbsp;checksum&gt;</td>
    398. 

  398.       <td bgcolor="#ffcccc" width="50%"><i>Backup data section 1
    399. 

  399. (system data)</i></td>
    400. 

  400.     </tr>
    401. 

  401.     <tr>
    402. 

  402.       <td bgcolor="#ccffcc">PC:</td>
    403. 

  403.       <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
    404. 

  404.       <td bgcolor="#ccffcc" width="50%"><i>Acknowledgement of data</i></td>
    405. 

  405.     </tr>
    406. 

  406.     <tr>
    407. 

  407.       <td bgcolor="#ffcccc">TI:</td>
    408. 

  408.       <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;15 35 00&nbsp;</tt></b>&lt;35h&nbsp;bytes&nbsp;of&nbsp;data&nbsp;plus&nbsp;checksum&gt;</td>
    409. 

  409.       <td bgcolor="#ffcccc" width="50%"><i>Backup data section 2 (user
    410. 

  410. data)</i></td>
    411. 

  411.     </tr>
    412. 

  412.     <tr>
    413. 

  413.       <td bgcolor="#ccffcc">PC:</td>
    414. 

  414.       <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
    415. 

  415.       <td bgcolor="#ccffcc" width="50%"><i>Acknowledgement of data</i></td>
    416. 

  416.     </tr>
    417. 

  417.     <tr>
    418. 

  418.       <td bgcolor="#ffcccc">TI:</td>
    419. 

  419.       <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;15&nbsp;71 00 </tt></b>&lt;71h&nbsp;bytes&nbsp;of&nbsp;data&nbsp;plus&nbsp;checksum&gt;</td>
    420. 

  420.       <td bgcolor="#ffcccc" width="50%"><i>Backup data section 3
    421. 

  421. (variable table)</i></td>
    422. 

  422.     </tr>
    423. 

  423.     <tr>
    424. 

  424.       <td bgcolor="#ccffcc">PC:</td>
    425. 

  425.       <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
    426. 

  426.       <td bgcolor="#ccffcc" width="50%"><i>Acknowledgement of data</i></td>
    427. 

  427.     </tr>
    428. 

  428.   </tbody>
    429. 

  429. </table>
    430. 

  430. </p>
    431. 

  431. <p></p>
    432. 

  432. <p><a name="rts"></a>The protocol for silently sending a backup is
    433. 

  433. shown below:</p>
    434. 

  434. <p>
    435. 

  435. <table bgcolor="#ffffff" border="1" cellspacing="0" width="92%">
    436. 

  436.   <tbody>
    437. 

  437.     <tr>
    438. 

  438.       <th bgcolor="#008800" width="7%"><font color="#ffffff">Step</font></th>
    439. 

  439.       <th colspan="3" bgcolor="#008800"><font color="#ffffff">Direction</font></th>
    440. 

  440.       <th bgcolor="#008800" width="80%"><font color="#ffffff">Packet</font></th>
    441. 

  441.     </tr>
    442. 

  442.     <tr>
    443. 

  443.       <td bgcolor="#ffffff" width="7%">
    444. 

  444.       <p align="center">1 </p>
    445. 

  445.       </td>
    446. 

  446.       <td rowspan="10">
    447. 

  447.       <p align="center"><img src="graphics/comp.gif" alt="Computer"
    448. 

  448.  align="bottom" border="0" height="33" width="30"> </p>
    449. 

  449.       </td>
    450. 

  450.       <td bgcolor="#ffffff" width="6%">
    451. 

  451.       <p align="center"><img src="graphics/right.gif" alt="===&gt;"
    452. 

  452.  align="bottom" border="0" height="13" width="22"> </p>
    453. 

  453.       </td>
    454. 

  454.       <td rowspan="10">
    455. 

  455.       <p align="center"><img src="graphics/calc.gif" alt="Calculator"
    456. 

  456.  align="bottom" border="0" height="67" width="30"> </p>
    457. 

  457.       </td>
    458. 

  458.       <td bgcolor="#ffffff" width="80%">RTS with <a
    459. 

  459.  href="packet.html#backup">backup-style header</a> and type ID = 13h.</td>
    460. 

  460.     </tr>
    461. 

  461.     <tr>
    462. 

  462.       <td bgcolor="#ffffff" width="7%">
    463. 

  463.       <p align="center">2 </p>
    464. 

  464.       </td>
    465. 

  465.       <td bgcolor="#ffffff" width="6%">
    466. 

  466.       <p align="center"><img src="graphics/left.gif" alt="&lt;==="
    467. 

  467.  align="bottom" border="0" height="13" width="22"> </p>
    468. 

  468.       </td>
    469. 

  469.       <td bgcolor="#ffffff" width="80%">ACK</td>
    470. 

  470.     </tr>
    471. 

  471.     <tr>
    472. 

  472.       <td bgcolor="#ffffff" width="7%">
    473. 

  473.       <p align="center">3 </p>
    474. 

  474.       </td>
    475. 

  475.       <td bgcolor="#ffffff" width="6%">
    476. 

  476.       <p align="center"><img src="graphics/left.gif" alt="&lt;==="
    477. 

  477.  align="bottom" border="0" height="13" width="22"> </p>
    478. 

  478.       </td>
    479. 

  479.       <td bgcolor="#ffffff" width="80%">CTS or SKIP/EXIT. If exit, do
    480. 

  480. step 4 and quit.</td>
    481. 

  481.     </tr>
    482. 

  482.     <tr>
    483. 

  483.       <td bgcolor="#ffffff" width="7%">
    484. 

  484.       <p align="center">4 </p>
    485. 

  485.       </td>
    486. 

  486.       <td bgcolor="#ffffff" width="6%">
    487. 

  487.       <p align="center"><img src="graphics/right.gif" alt="===&gt;"
    488. 

  488.  align="bottom" border="0" height="13" width="22"> </p>
    489. 

  489.       </td>
    490. 

  490.       <td bgcolor="#ffffff" width="80%">ACK</td>
    491. 

  491.     </tr>
    492. 

  492.     <tr>
    493. 

  493.       <td width="7%">
    494. 

  494.       <p align="center">5 </p>
    495. 

  495.       </td>
    496. 

  496.       <td width="6%">
    497. 

  497.       <p align="center"><img src="graphics/right.gif" alt="===&gt;"
    498. 

  498.  align="bottom" border="0" height="13" width="22"> </p>
    499. 

  499.       </td>
    500. 

  500.       <td width="80%">DATA - section 1 (system data)</td>
    501. 

  501.     </tr>
    502. 

  502.     <tr>
    503. 

  503.       <td width="7%">
    504. 

  504.       <p align="center">6 </p>
    505. 

  505.       </td>
    506. 

  506.       <td width="6%">
    507. 

  507.       <p align="center"><img src="graphics/left.gif" alt="&lt;==="
    508. 

  508.  align="bottom" border="0" height="13" width="22"> </p>
    509. 

  509.       </td>
    510. 

  510.       <td width="80%">ACK</td>
    511. 

  511.     </tr>
    512. 

  512.     <tr>
    513. 

  513.       <td width="7%">
    514. 

  514.       <p align="center">7 </p>
    515. 

  515.       </td>
    516. 

  516.       <td width="6%">
    517. 

  517.       <p align="center"><img src="graphics/right.gif" alt="===&gt;"
    518. 

  518.  align="bottom" border="0" height="13" width="22"> </p>
    519. 

  519.       </td>
    520. 

  520.       <td width="80%">DATA - section 2 (user data)</td>
    521. 

  521.     </tr>
    522. 

  522.     <tr>
    523. 

  523.       <td width="7%">
    524. 

  524.       <p align="center">8 </p>
    525. 

  525.       </td>
    526. 

  526.       <td width="6%">
    527. 

  527.       <p align="center"><img src="graphics/left.gif" alt="&lt;==="
    528. 

  528.  align="bottom" border="0" height="13" width="22"> </p>
    529. 

  529.       </td>
    530. 

  530.       <td width="80%">ACK</td>
    531. 

  531.     </tr>
    532. 

  532.     <tr>
    533. 

  533.       <td width="7%">
    534. 

  534.       <p align="center">9 </p>
    535. 

  535.       </td>
    536. 

  536.       <td width="6%">
    537. 

  537.       <p align="center"><img src="graphics/right.gif" alt="===&gt;"
    538. 

  538.  align="bottom" border="0" height="13" width="22"> </p>
    539. 

  539.       </td>
    540. 

  540.       <td width="80%">DATA - section 3 (variable table?)</td>
    541. 

  541.     </tr>
    542. 

  542.     <tr>
    543. 

  543.       <td width="7%">
    544. 

  544.       <p align="center">10 </p>
    545. 

  545.       </td>
    546. 

  546.       <td width="6%">
    547. 

  547.       <p align="center"><img src="graphics/left.gif" alt="&lt;==="
    548. 

  548.  align="bottom" border="0" height="13" width="22"> </p>
    549. 

  549.       </td>
    550. 

  550.       <td width="80%">ACK</td>
    551. 

  551.     </tr>
    552. 

  552.   </tbody>
    553. 

  553. </table>
    554. 

  554. </p>
    555. 

  555. <p></p>
    556. 

  556. <p><u>Example:</u><br>
    557. 

  557. <table border="0" cellspacing="0" width="100%">
    558. 

  558.   <tbody>
    559. 

  559.     <tr>
    560. 

  560.       <td bgcolor="#ccffcc">PC:</td>
    561. 

  561.       <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;C9&nbsp;09&nbsp;00
    562. 

  562.       </tt></b><tt>DC 16 13 35 00 71 00 37 9C <b>7E 02</b></tt></td>
    563. 

  563.       <td bgcolor="#ccffcc" width="50%"><i>Request to send backup</i></td>
    564. 

  564.     </tr>
    565. 

  565.     <tr>
    566. 

  566.       <td bgcolor="#ffcccc">TI:</td>
    567. 

  567.       <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
    568. 

  568.       <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of RTS</i></td>
    569. 

  569.     </tr>
    570. 

  570.     <tr>
    571. 

  571.       <td bgcolor="#ffcccc">&nbsp;</td>
    572. 

  572.       <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;09&nbsp;00&nbsp;00</tt></b></td>
    573. 

  573.       <td bgcolor="#ffcccc" width="50%"><i>Clear to send backup</i></td>
    574. 

  574.     </tr>
    575. 

  575.     <tr>
    576. 

  576.       <td bgcolor="#ccffcc">PC:</td>
    577. 

  577.       <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
    578. 

  578.       <td bgcolor="#ccffcc" width="50%"><i>Acknowledgement of CTS</i></td>
    579. 

  579.     </tr>
    580. 

  580.     <tr>
    581. 

  581.       <td bgcolor="#ccffcc">&nbsp;</td>
    582. 

  582.       <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;15 DC 16 </tt></b>&lt;13A5h&nbsp;bytes&nbsp;of&nbsp;data&nbsp;plus&nbsp;checksum&gt;</td>
    583. 

  583.       <td bgcolor="#ccffcc" width="50%"><i>Backup data section 1
    584. 

  584. (system data)</i></td>
    585. 

  585.     </tr>
    586. 

  586.     <tr>
    587. 

  587.       <td bgcolor="#ffcccc">TI:</td>
    588. 

  588.       <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
    589. 

  589.       <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of data</i></td>
    590. 

  590.     </tr>
    591. 

  591.     <tr>
    592. 

  592.       <td bgcolor="#ccffcc">PC:</td>
    593. 

  593.       <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;15 00 35 </tt></b>&lt;35h&nbsp;bytes&nbsp;of&nbsp;data&nbsp;plus&nbsp;checksum&gt;</td>
    594. 

  594.       <td bgcolor="#ccffcc" width="50%"><i>Backup data section 2 (user
    595. 

  595. data)</i></td>
    596. 

  596.     </tr>
    597. 

  597.     <tr>
    598. 

  598.       <td bgcolor="#ffcccc">TI:</td>
    599. 

  599.       <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
    600. 

  600.       <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of data</i></td>
    601. 

  601.     </tr>
    602. 

  602.     <tr>
    603. 

  603.       <td bgcolor="#ccffcc">PC:</td>
    604. 

  604.       <td bgcolor="#ccffcc" width="50%"><b><tt>07&nbsp;15&nbsp;71 00 </tt></b>&lt;71h&nbsp;bytes&nbsp;of&nbsp;data&nbsp;plus&nbsp;checksum&gt;</td>
    605. 

  605.       <td bgcolor="#ccffcc" width="50%"><i>Backup data section 3
    606. 

  606. (variable table)</i></td>
    607. 

  607.     </tr>
    608. 

  608.     <tr>
    609. 

  609.       <td bgcolor="#ffcccc">TI:</td>
    610. 

  610.       <td bgcolor="#ffcccc" width="50%"><b><tt>74&nbsp;56&nbsp;00&nbsp;00</tt></b></td>
    611. 

  611.       <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of data</i></td>
    612. 

  612.     </tr>
    613. 

  613.     <tr>
    614. 

  614.       <td bgcolor="#ccffcc">PC:</td>
    615. 

  615.       <td bgcolor="#ccffcc" width="50%"><b><tt>07 56 00 00</tt></b></td>
    616. 

  616.       <td bgcolor="#ccffcc" width="50%"><i>Acknowledgment ?<br>
    617. 

  617.       </i></td>
    618. 

  618.     </tr>
    619. 

  619.   </tbody>
    620. 

  620. </table>
    621. 

  621. <br>
    622. 

  622. <table border="0" cellspacing="0" width="100%">
    623. 

  623.   <tbody>
    624. 

  624.     <tr>
    625. 

  625.       <td width="32%">
    626. 

  626.       <p align="center"><a href="silent.html"><img
    627. 

  627.  src="graphics/prevpage.gif" alt="[previous page]" align="bottom"
    628. 

  628.  border="2" height="32" width="32"><br>
    629. 

  629. Silent transfers</a> </p>
    630. 

  630.       </td>
    631. 

  631.       <td width="34%">
    632. 

  632.       <p align="center"><a href="index.html"><img
    633. 

  633.  src="graphics/home.gif" alt="[home]" align="bottom" border="2"
    634. 

  634.  height="32" width="32"><br>
    635. 

  635. Table of Contents</a> </p>
    636. 

  636.       </td>
    637. 

  637.       <td width="34%">
    638. 

  638.       <p align="center"><a href="flash.html"><img
    639. 

  639.  src="graphics/nextpage.gif" alt="[next page]" align="bottom" border="2"
    640. 

  640.  height="32" width="32"><br>
    641. 

  641. Flash Transfers</a> </p>
    642. 

  642.       </td>
    643. 

  643.     </tr>
    644. 

  644.   </tbody>
    645. 

  645. </table>
    646. 

  646. </p>
    647. 

  647. <hr align="center"><i>Site maintained by Romain Li&eacute;vin (</i><a
    648. 

  648.  href="mailto:roms@lpg.ticalc.org"><i>roms@lpg.ticalc.org</i></a><i>)
    649. 

  649. and Tim Singer (</i><a href="mailto:tsinger@gladstone.uoregon.edu"><i>tsinger@gladstone.uoregon.edu</i></a><i>)</i>
    650. 

  650. </body>
    651. 

  651. </html>
    652.