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	<TITLE>TI-73 Link Protocol Guide - Screenshots</TITLE>
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<P><B>TI-73 Link Protocol Guide v1.0</B> - Screenshots</P>
<CENTER>
<H2>
<HR ALIGN="CENTER">
Screenshots</H2>
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<P>The TI-73's screenshot ability is &quot;silent,&quot; which means that the calculator does not need to be put
in a special mode. Screenshots can be taken any time the calculator is ready to accept a keypress.</P>
<P>The protocol used for getting a screenshot is shown below. For information on packet formats, <A HREF="packet.html">click
here</A>.</P>
<P>
<TABLE BORDER="1" CELLSPACING="0" WIDTH="92%" BGCOLOR="#FFFFFF">
	<TR>
		<TH WIDTH="7%" BGCOLOR="#008800"><FONT COLOR="#FFFFFF">Step</FONT></TH>
		<TH COLSPAN="3" BGCOLOR="#008800"><FONT COLOR="#FFFFFF">Direction</FONT></TH>
		<TH WIDTH="80%" BGCOLOR="#008800"><FONT COLOR="#FFFFFF">Packet</FONT></TH>
	</TR>
	<TR>
		<TD WIDTH="7%" BGCOLOR="#FFFFFF">
			<P ALIGN="CENTER">1
		</TD>
		<TD ROWSPAN="4">
			<P ALIGN="CENTER"><IMG SRC="graphics/comp.gif" WIDTH="30" HEIGHT="33" ALIGN="BOTTOM" ALT="Computer" BORDER="0">
		</TD>
		<TD BGCOLOR="#FFFFFF">
			<P ALIGN="CENTER"><IMG SRC="graphics/right.gif" WIDTH="22" HEIGHT="13" ALIGN="BOTTOM" ALT="===>" BORDER="0">
		</TD>
		<TD ROWSPAN="4" BGCOLOR="#FFFFFF">
			<P ALIGN="CENTER"><IMG SRC="graphics/calc.gif" WIDTH="30" HEIGHT="67" ALIGN="BOTTOM" ALT="Calculator" BORDER="0">
		</TD>
		<TD WIDTH="80%" BGCOLOR="#FFFFFF">SCR</TD>
	</TR>
	<TR>
		<TD WIDTH="7%" BGCOLOR="#FFFFFF">
			<P ALIGN="CENTER">2
		</TD>
		<TD BGCOLOR="#FFFFFF">
			<P ALIGN="CENTER"><IMG SRC="graphics/left.gif" WIDTH="22" HEIGHT="13" ALIGN="BOTTOM" ALT="<===" BORDER="0">
		</TD>
		<TD WIDTH="80%" BGCOLOR="#FFFFFF">ACK</TD>
	</TR>
	<TR>
		<TD WIDTH="7%" BGCOLOR="#FFFFFF">
			<P ALIGN="CENTER">3
		</TD>
		<TD BGCOLOR="#FFFFFF">
			<P ALIGN="CENTER"><IMG SRC="graphics/left.gif" WIDTH="22" HEIGHT="13" ALIGN="BOTTOM" ALT="<===" BORDER="0">
		</TD>
		<TD WIDTH="80%" BGCOLOR="#FFFFFF">DATA - Format described below.</TD>
	</TR>
	<TR>
		<TD WIDTH="7%" BGCOLOR="#FFFFFF">
			<P ALIGN="CENTER">4
		</TD>
		<TD BGCOLOR="#FFFFFF">
			<P ALIGN="CENTER"><IMG SRC="graphics/right.gif" WIDTH="22" HEIGHT="13" ALIGN="BOTTOM" ALT="===>" BORDER="0">
		</TD>
		<TD WIDTH="80%" BGCOLOR="#FFFFFF">ACK</TD>
	</TR>
</TABLE>
<p></P>
<P>The data packet contains a 768-byte monochrome bitmap (1 bit per pixel). Each bit has a value of 1 if the corresponding
pixel is dark or a value of 0 if the corresponding pixel is light.</P>
<P>The pixel order is left-to-right, then top-to-bottom (See figure below).<BR>
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
the first row, bytes 12-23 define the second row, etc.</P>
<P><U>Example:</U><BR>

<TABLE BORDER="0" CELLSPACING="0" WIDTH="100%">
	<TR>
		<TD BGCOLOR="#CCFFCC">PC:</TD>
		
    <TD WIDTH="50%" BGCOLOR="#CCFFCC"><B><TT>07&nbsp;6D&nbsp;00&nbsp;00</TT></B></TD>
		<TD WIDTH="50%" BGCOLOR="#CCFFCC"><I>Screenshot request</I></TD>
	</TR>
	<TR>
		<TD BGCOLOR="#FFCCCC">TI:</TD>
		
    <TD WIDTH="50%" BGCOLOR="#FFCCCC"><B><TT>74&nbsp;56&nbsp;00&nbsp;00</TT></B></TD>
		<TD WIDTH="50%" BGCOLOR="#FFCCCC"><I>Acknowledgement of request</I></TD>
	</TR>
	<TR>
		<TD BGCOLOR="#FFCCCC">&nbsp;</TD>
		
    <TD WIDTH="50%" BGCOLOR="#FFCCCC"><B><TT>74&nbsp;15&nbsp;00&nbsp;03&nbsp;</TT></B>&lt;768&nbsp;bytes&nbsp;plus&nbsp;2&nbsp;byte&nbsp;checksum&gt;</TD>
		<TD WIDTH="50%" BGCOLOR="#FFCCCC"><I>Screen data</I></TD>
	</TR>
	<TR>
		<TD BGCOLOR="#CCFFCC">PC:</TD>
		
    <TD WIDTH="50%" BGCOLOR="#CCFFCC"><B><TT>07&nbsp;56&nbsp;00&nbsp;00</TT></B></TD>
		<TD WIDTH="50%" BGCOLOR="#CCFFCC"><I>Acknowledgement of data</I></TD>
	</TR>
</TABLE>
<p></P>
<P>The following figure demonstrates byte ordering of the pixels if the bitmap is in a 768-element array data[]:</P>
<P><IMG SRC="graphics/scrnshot.gif" WIDTH="336" HEIGHT="274" ALIGN="BOTTOM" ALT="[pixel grid diagram]" BORDER="0"></P>
<P>Note that this format is different from the standard Windows bitmap format, which specifies a value of 1 if
the pixel is light and bottom-to-top row order.</P>

<P>
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			Packet Formats</A>
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			Manual Transfers</A>
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<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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