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screenshot.html

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

  2. <HTML>
    3. 

  3. 

  4. <HEAD>
    5. 

  5. 	<META NAME="GENERATOR" Content="Visual Page 1.0 for Windows">
    6. 

  6. 	<META HTTP-EQUIV="Content-Type" CONTENT="text/html;CHARSET=iso-8859-1">
    7. 

  7. 	<TITLE>TI-82 Link Protocol Guide - Screenshots</TITLE>
    8. 

  8. </HEAD>
    9. 

  9. 

  10. <BODY BGCOLOR="#FFFFE8">
    11. 

  11. 

  12. <P><B>TI-82 Link Protocol Guide v1.0</B> - Screenshots</P>
    13. 

  13. <CENTER>
    14. 

  14. <H2>
    15. 

  15. <HR ALIGN="CENTER">
    16. 

  16. Screenshots</H2>
    17. 

  17. </CENTER>
    18. 

  18. <P>The TI-82's screenshot ability is &quot;silent,&quot; which means that the calculator does not need to be put
    19. 

  19. in a special mode. Screenshots can be taken any time the calculator is ready to accept a keypress.</P>
    20. 

  20. <P>The protocol used for getting a screenshot is shown below. For information on packet formats, <A HREF="packet.html">click
    21. 

  21. here</A>.</P>
    22. 

  22. <P>
    23. 

  23. <TABLE BORDER="1" CELLSPACING="0" WIDTH="92%" BGCOLOR="#FFFFFF">
    24. 

  24. 	<TR>
    25. 

  25. 		<TH WIDTH="7%" BGCOLOR="#008800"><FONT COLOR="#FFFFFF">Step</FONT></TH>
    26. 

  26. 		<TH COLSPAN="3" BGCOLOR="#008800"><FONT COLOR="#FFFFFF">Direction</FONT></TH>
    27. 

  27. 		<TH WIDTH="80%" BGCOLOR="#008800"><FONT COLOR="#FFFFFF">Packet</FONT></TH>
    28. 

  28. 	</TR>
    29. 

  29. 	<TR>
    30. 

  30. 		<TD WIDTH="7%" BGCOLOR="#FFFFFF">
    31. 

  31. 			<P ALIGN="CENTER">1
    32. 

  32. 		</TD>
    33. 

  33. 		<TD ROWSPAN="4">
    34. 

  34. 			<P ALIGN="CENTER"><IMG SRC="graphics/comp.gif" WIDTH="30" HEIGHT="33" ALIGN="BOTTOM" ALT="Computer" BORDER="0">
    35. 

  35. 		</TD>
    36. 

  36. 		<TD BGCOLOR="#FFFFFF">
    37. 

  37. 			<P ALIGN="CENTER"><IMG SRC="graphics/right.gif" WIDTH="22" HEIGHT="13" ALIGN="BOTTOM" ALT="===>" BORDER="0">
    38. 

  38. 		</TD>
    39. 

  39. 		<TD ROWSPAN="4" BGCOLOR="#FFFFFF">
    40. 

  40. 			<P ALIGN="CENTER"><IMG SRC="graphics/calc.gif" WIDTH="30" HEIGHT="67" ALIGN="BOTTOM" ALT="Calculator" BORDER="0">
    41. 

  41. 		</TD>
    42. 

  42. 		<TD WIDTH="80%" BGCOLOR="#FFFFFF">SCR</TD>
    43. 

  43. 	</TR>
    44. 

  44. 	<TR>
    45. 

  45. 		<TD WIDTH="7%" BGCOLOR="#FFFFFF">
    46. 

  46. 			<P ALIGN="CENTER">2
    47. 

  47. 		</TD>
    48. 

  48. 		<TD BGCOLOR="#FFFFFF">
    49. 

  49. 			<P ALIGN="CENTER"><IMG SRC="graphics/left.gif" WIDTH="22" HEIGHT="13" ALIGN="BOTTOM" ALT="<===" BORDER="0">
    50. 

  50. 		</TD>
    51. 

  51. 		<TD WIDTH="80%" BGCOLOR="#FFFFFF">ACK</TD>
    52. 

  52. 	</TR>
    53. 

  53. 	<TR>
    54. 

  54. 		<TD WIDTH="7%" BGCOLOR="#FFFFFF">
    55. 

  55. 			<P ALIGN="CENTER">3
    56. 

  56. 		</TD>
    57. 

  57. 		<TD BGCOLOR="#FFFFFF">
    58. 

  58. 			<P ALIGN="CENTER"><IMG SRC="graphics/left.gif" WIDTH="22" HEIGHT="13" ALIGN="BOTTOM" ALT="<===" BORDER="0">
    59. 

  59. 		</TD>
    60. 

  60. 		<TD WIDTH="80%" BGCOLOR="#FFFFFF">DATA - Format described below.</TD>
    61. 

  61. 	</TR>
    62. 

  62. 	<TR>
    63. 

  63. 		<TD WIDTH="7%" BGCOLOR="#FFFFFF">
    64. 

  64. 			<P ALIGN="CENTER">4
    65. 

  65. 		</TD>
    66. 

  66. 		<TD BGCOLOR="#FFFFFF">
    67. 

  67. 			<P ALIGN="CENTER"><IMG SRC="graphics/right.gif" WIDTH="22" HEIGHT="13" ALIGN="BOTTOM" ALT="===>" BORDER="0">
    68. 

  68. 		</TD>
    69. 

  69. 		<TD WIDTH="80%" BGCOLOR="#FFFFFF">ACK</TD>
    70. 

  70. 	</TR>
    71. 

  71. </TABLE>
    72. 

  72. </P>
    73. 

  73. <P>The data packet contains a 768-byte monochrome bitmap (1 bit per pixel). Each bit has a value of 1 if the corresponding
    74. 

  74. pixel is dark or a value of 0 if the corresponding pixel is light.</P>
    75. 

  75. <P>The pixel order is left-to-right, then top-to-bottom (See figure below).<BR>
    76. 

  76. Byte 0 defines the first 8 pixels in the left side of the top row of the screen. Bytes 1-11 define the rest of
    77. 

  77. the first row, bytes 12-23 define the second row, etc.</P>
    78. 

  78. 

  79. <P><U>Example:</U><BR>
    80. 

  80. 

  81. <TABLE BORDER="0" CELLSPACING="0" WIDTH="100%">
    82. 

  82. 	<TR>
    83. 

  83. 		<TD BGCOLOR="#CCFFCC">PC:</TD>
    84. 

  84. 		<TD WIDTH="50%" BGCOLOR="#CCFFCC"><B><TT>02&nbsp;6D&nbsp;00&nbsp;00</TT></B></TD>
    85. 

  85. 		<TD WIDTH="50%" BGCOLOR="#CCFFCC"><I>Screenshot request</I></TD>
    86. 

  86. 	</TR>
    87. 

  87. 	<TR>
    88. 

  88. 		<TD BGCOLOR="#FFCCCC">TI:</TD>
    89. 

  89. 		<TD WIDTH="50%" BGCOLOR="#FFCCCC"><B><TT>82&nbsp;56&nbsp;00&nbsp;00</TT></B></TD>
    90. 

  90. 		<TD WIDTH="50%" BGCOLOR="#FFCCCC"><I>Acknowledgement of request</I></TD>
    91. 

  91. 	</TR>
    92. 

  92. 	<TR>
    93. 

  93. 		<TD BGCOLOR="#FFCCCC">&nbsp;</TD>
    94. 

  94. 		<TD WIDTH="50%" BGCOLOR="#FFCCCC"><B><TT>82&nbsp;15&nbsp;00&nbsp;03&nbsp;</TT></B>&lt;768&nbsp;bytes&nbsp;plus&nbsp;2&nbsp;byte&nbsp;checksum&gt;</TD>
    95. 

  95. 		<TD WIDTH="50%" BGCOLOR="#FFCCCC"><I>Screen data</I></TD>
    96. 

  96. 	</TR>
    97. 

  97. 	<TR>
    98. 

  98. 		<TD BGCOLOR="#CCFFCC">PC:</TD>
    99. 

  99. 		<TD WIDTH="50%" BGCOLOR="#CCFFCC"><B><TT>02&nbsp;56&nbsp;00&nbsp;00</TT></B></TD>
    100. 

  100. 		<TD WIDTH="50%" BGCOLOR="#CCFFCC"><I>Acknowledgement of data</I></TD>
    101. 

  101. 	</TR>
    102. 

  102. </TABLE>
    103. 

  103. </P>
    104. 

  104. 

  105. <P>The following figure demonstrates byte ordering of the pixels if the bitmap is in a 768-element array data[]:</P>
    106. 

  106. 

  107. <P><IMG SRC="graphics/scrnshot.gif" WIDTH="336" HEIGHT="274" ALIGN="BOTTOM" ALT="[pixel grid diagram]" BORDER="0"></P>
    108. 

  108. 

  109. <P>Note that this format is different from the standard Windows bitmap format, which specifies a value of 1 if
    110. 

  110. the pixel is light and bottom-to-top row order.</P>
    111. 

  111. 

  112. <P>
    113. 

  113. <HR ALIGN="CENTER">
    114. 

  114. Alternately, the TI-82 may send the screenshot by executing the PrintScreen command. In that case, this protocol
    115. 

  115. is used:</P>
    116. 

  116. 

  117. <P>
    118. 

  118. <TABLE BORDER="1" CELLSPACING="0" WIDTH="92%" BGCOLOR="#FFFFFF">
    119. 

  119. 	<TR>
    120. 

  120. 		<TH WIDTH="7%" BGCOLOR="#008800"><FONT COLOR="#FFFFFF">Step</FONT></TH>
    121. 

  121. 		<TH COLSPAN="3" BGCOLOR="#008800"><FONT COLOR="#FFFFFF">Direction</FONT></TH>
    122. 

  122. 		<TH WIDTH="80%" BGCOLOR="#008800"><FONT COLOR="#FFFFFF">Packet</FONT></TH>
    123. 

  123. 	</TR>
    124. 

  124. 	<TR>
    125. 

  125. 		<TD WIDTH="7%" BGCOLOR="#FFFFFF">
    126. 

  126. 			<P ALIGN="CENTER">1
    127. 

  127. 		</TD>
    128. 

  128. 		<TD ROWSPAN="6">
    129. 

  129. 			<P ALIGN="CENTER"><IMG SRC="graphics/comp.gif" WIDTH="30" HEIGHT="33" ALIGN="BOTTOM" ALT="Computer" BORDER="0">
    130. 

  130. 		</TD>
    131. 

  131. 		<TD BGCOLOR="#FFFFFF">
    132. 

  132. 			<P ALIGN="CENTER"><IMG SRC="graphics/left.gif" WIDTH="22" HEIGHT="13" ALIGN="BOTTOM" ALT="<===" BORDER="0">
    133. 

  133. 		</TD>
    134. 

  134. 		<TD ROWSPAN="6" BGCOLOR="#FFFFFF">
    135. 

  135. 			<P ALIGN="CENTER"><IMG SRC="graphics/calc.gif" WIDTH="30" HEIGHT="67" ALIGN="BOTTOM" ALT="Calculator" BORDER="0">
    136. 

  136. 		</TD>
    137. 

  137. 		<TD WIDTH="80%" BGCOLOR="#FFFFFF">VAR with Type ID=0Eh</TD>
    138. 

  138. 	</TR>
    139. 

  139. 	<TR>
    140. 

  140. 		<TD WIDTH="7%" BGCOLOR="#FFFFFF">
    141. 

  141. 			<P ALIGN="CENTER">2
    142. 

  142. 		</TD>
    143. 

  143. 		<TD BGCOLOR="#FFFFFF">
    144. 

  144. 			<P ALIGN="CENTER"><IMG SRC="graphics/right.gif" WIDTH="22" HEIGHT="13" ALIGN="BOTTOM" ALT="===>" BORDER="0">
    145. 

  145. 		</TD>
    146. 

  146. 		<TD WIDTH="80%" BGCOLOR="#FFFFFF">ACK</TD>
    147. 

  147. 	</TR>
    148. 

  148. 	<TR>
    149. 

  149. 		<TD WIDTH="7%" BGCOLOR="#FFFFFF">
    150. 

  150. 			<P ALIGN="CENTER">3
    151. 

  151. 		</TD>
    152. 

  152. 		<TD BGCOLOR="#FFFFFF">
    153. 

  153. 			<P ALIGN="CENTER"><IMG SRC="graphics/right.gif" WIDTH="22" HEIGHT="13" ALIGN="BOTTOM" ALT="===>" BORDER="0">
    154. 

  154. 		</TD>
    155. 

  155. 		<TD WIDTH="80%" BGCOLOR="#FFFFFF">CTS</TD>
    156. 

  156. 	</TR>
    157. 

  157. 	<TR>
    158. 

  158. 		<TD WIDTH="7%" BGCOLOR="#FFFFFF">
    159. 

  159. 			<P ALIGN="CENTER">4
    160. 

  160. 		</TD>
    161. 

  161. 		<TD BGCOLOR="#FFFFFF">
    162. 

  162. 			<P ALIGN="CENTER"><IMG SRC="graphics/left.gif" WIDTH="22" HEIGHT="13" ALIGN="BOTTOM" ALT="<===" BORDER="0">
    163. 

  163. 		</TD>
    164. 

  164. 		<TD WIDTH="80%" BGCOLOR="#FFFFFF">ACK</TD>
    165. 

  165. 	</TR>
    166. 

  166. 	<TR>
    167. 

  167. 		<TD WIDTH="7%">
    168. 

  168. 			<P ALIGN="CENTER">5
    169. 

  169. 		</TD>
    170. 

  170. 		<TD>
    171. 

  171. 			<P ALIGN="CENTER"><IMG SRC="graphics/left.gif" WIDTH="22" HEIGHT="13" ALIGN="BOTTOM" ALT="<===" BORDER="0">
    172. 

  172. 		</TD>
    173. 

  173. 		<TD WIDTH="80%">DATA (format described above).</TD>
    174. 

  174. 	</TR>
    175. 

  175. 	<TR>
    176. 

  176. 		<TD WIDTH="7%">
    177. 

  177. 			<P ALIGN="CENTER">6
    178. 

  178. 		</TD>
    179. 

  179. 		<TD>
    180. 

  180. 			<P ALIGN="CENTER"><IMG SRC="graphics/right.gif" WIDTH="22" HEIGHT="13" ALIGN="BOTTOM" ALT="===>" BORDER="0">
    181. 

  181. 		</TD>
    182. 

  182. 		<TD WIDTH="80%">ACK</TD>
    183. 

  183. 	</TR>
    184. 

  184. </TABLE>
    185. 

  185. The data format is the same as in the above transfer.</P>
    186. 

  186. 

  187. <P><U>Example:</U><BR>
    188. 

  188. 

  189. <TABLE BORDER="0" CELLSPACING="0" WIDTH="100%">
    190. 

  190. 	<TR>
    191. 

  191. 		<TD BGCOLOR="#FFCCCC">TI:</TD>
    192. 

  192. 		<TD WIDTH="50%" BGCOLOR="#FFCCCC"><B><TT>82&nbsp;06&nbsp;0B&nbsp;00&nbsp;</TT></B><TT>00&nbsp;03&nbsp;0E&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;00&nbsp;<B>11&nbsp;00</B></TT></TD>
    193. 

  193. 		<TD WIDTH="50%" BGCOLOR="#FFCCCC"><I>Variable Header: Screenshot</I></TD>
    194. 

  194. 	</TR>
    195. 

  195. 	<TR>
    196. 

  196. 		<TD BGCOLOR="#CCFFCC">PC:</TD>
    197. 

  197. 		<TD WIDTH="50%" BGCOLOR="#CCFFCC"><B><TT>02&nbsp;56&nbsp;00&nbsp;00</TT></B></TD>
    198. 

  198. 		<TD WIDTH="50%" BGCOLOR="#CCFFCC"><I>Acknowledgement of header</I></TD>
    199. 

  199. 	</TR>
    200. 

  200. 	<TR>
    201. 

  201. 		<TD BGCOLOR="#CCFFCC">&nbsp;</TD>
    202. 

  202. 		<TD WIDTH="50%" BGCOLOR="#CCFFCC"><B><TT>02&nbsp;09&nbsp;00&nbsp;00</TT></B></TD>
    203. 

  203. 		<TD WIDTH="50%" BGCOLOR="#CCFFCC"><I>Clear to send header</I></TD>
    204. 

  204. 	</TR>
    205. 

  205. 	<TR>
    206. 

  206. 		<TD BGCOLOR="#FFCCCC">TI:</TD>
    207. 

  207. 		<TD WIDTH="50%" BGCOLOR="#FFCCCC"><B><TT>82&nbsp;56&nbsp;00&nbsp;00</TT></B></TD>
    208. 

  208. 		<TD WIDTH="50%" BGCOLOR="#FFCCCC"><I>Acknowledgement of CTS</I></TD>
    209. 

  209. 	</TR>
    210. 

  210. 	<TR>
    211. 

  211. 		<TD BGCOLOR="#FFCCCC">&nbsp;</TD>
    212. 

  212. 		<TD WIDTH="50%" BGCOLOR="#FFCCCC"><B><TT>82&nbsp;15&nbsp;00&nbsp;04&nbsp;</TT></B>&lt;768&nbsp;bytes&nbsp;plus&nbsp;2&nbsp;byte&nbsp;checksum&gt;</TD>
    213. 

  213. 		<TD WIDTH="50%" BGCOLOR="#FFCCCC"><I>Screen data</I></TD>
    214. 

  214. 	</TR>
    215. 

  215. 	<TR>
    216. 

  216. 		<TD BGCOLOR="#CCFFCC">PC:</TD>
    217. 

  217. 		<TD WIDTH="50%" BGCOLOR="#CCFFCC"><B><TT>02&nbsp;56&nbsp;00&nbsp;00</TT></B></TD>
    218. 

  218. 		<TD WIDTH="50%" BGCOLOR="#CCFFCC"><I>Acknowledgement of data</I></TD>
    219. 

  219. 	</TR>
    220. 

  220. </TABLE>
    221. 

  221. </P>
    222. 

  222. 

  223. <P>
    224. 

  224. <TABLE BORDER="0" CELLSPACING="0" WIDTH="100%">
    225. 

  225. 	<TR>
    226. 

  226. 		<TD WIDTH="32%">
    227. 

  227. 			<P ALIGN="CENTER"><A HREF="packet.html"><IMG SRC="graphics/prevpage.gif" WIDTH="32" HEIGHT="32" ALIGN="BOTTOM"
    228. 

  228. 			ALT="[previous page]" BORDER="2"><BR>
    229. 

  229. 			Packet Formats</A>
    230. 

  230. 		</TD>
    231. 

  231. 		<TD WIDTH="34%">
    232. 

  232. 			<P ALIGN="CENTER"><A HREF="index.html"><IMG SRC="graphics/home.gif" WIDTH="32" HEIGHT="32" ALIGN="BOTTOM" ALT="[home]"
    233. 

  233. 			BORDER="2"><BR>
    234. 

  234. 			Table of Contents</A>
    235. 

  235. 		</TD>
    236. 

  236. 		<TD WIDTH="34%">
    237. 

  237. 			<P ALIGN="CENTER"><A HREF="manual.html"><IMG SRC="graphics/nextpage.gif" WIDTH="32" HEIGHT="32" ALIGN="BOTTOM"
    238. 

  238. 			ALT="[next page]" BORDER="2"><BR>
    239. 

  239. 			Manual Transfers</A>
    240. 

  240. 		</TD>
    241. 

  241. 	</TR>
    242. 

  242. </TABLE>
    243. 

  243. 

  244. <HR ALIGN="CENTER">
    245. 

  245. <I>Site maintained by Romain Li&eacute;vin (</I><A HREF="mailto:roms@lpg.ticalc.org"><I>roms@lpg.ticalc.org</I></A><I>)
    246. 

  246. and Tim Singer (</I><A HREF="mailto:tsinger@gladstone.uoregon.edu"><I>tsinger@gladstone.uoregon.edu</I></A><I>)</I>
    247. 

  247. 

  248. </BODY>
    249. 

  249. 

  250. </HTML>
    251.