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			<title>Display Card 8/24: RS-170 External Sync</title><body class="ac-gn-current-support">
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<h1 id="main-title">Display Card 8/24: RS-170 External Sync</h1>
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<div id="intro-container"><div class="truncate"><div class="attr SYMPTOMS"><div class="attr TOPIC"><FONT SIZE=4> </FONT><BR>
<FONT SIZE=4> <BR>
Do the Apple Display Cards 8/24 and 8/24 GC accept an external sync signal when<BR>
in RS-170 mode?  How is RS-170 external sync mode enabled?<BR>
 <BR>
</FONT></div></div> <!--  attr Symptom  --></div> <!--  truncate --></div> <!--  intro-container --><div class="clear"> </div>
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  <div class="attr SUMMARY">
The video cards alone do not except external sync -- however, if the video<BR>
cards are being used in an environment where external sync is an issue, an<BR>
RGB-to-NTSC converter is very likely in use.  Truevision's VIDI/O Box and<BR>
RasterOps' Video Expander can be used with either video card to allow external<BR>
sync ability.<BR>
 <BR>
The specifics of using external sync are provided in each converter<BR>
manufacturer's documentation.<BR>
 <BR>
At announcement, many references were made to the Display Card 8/24 being<BR>
RS-170.  In actuality, the production video cards meet the full RS-170-A<BR>
specifications -- RS-170 being the original black and white specification;<BR>
RS-170-A is the color extension to the original specification.<BR>
 <BR>
Without one of the above converters, the interlaced signal coming from the<BR>
Display Card 8/24 and 8/24 GC will still be in black and white.  With one of<BR>
the converters, the Display Card 8/24 and 8/24 GC will provide full RS-170-A<BR>
color.<BR>
 <BR>
<BR></div>
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<div class="mod-date">Published Date: Feb 18, 2012</div>
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