Add Panaplex photos.

One lit, one unlit.

parts.htm

@@ -54,6 +54,24 @@ <H2>Nixie Tubes</H2>
 <A HREF="http://www.decadecounter.com/vta/">The Vintage Technology Association</A>.
 <BR CLEAR=RIGHT>
 </P>
+<A NAME="Panaplex">
+<H2>Panaplex Displays</H2>
+<P>
+<IMG ALIGN=LEFT SRC="panaplex1.jpg" ALT="Panaplex display" WIDTH=201 HEIGHT=200>
+<IMG ALIGN=LEFT SRC="panaplex2.jpg" ALT="Panaplex display illuminated" WIDTH=397 HEIGHT=200>
+Panaplex displays, like Nixie tubes,
+are basically neon lamps, but with the electrodes arranged as seven segments.
+High-voltage driver chips were available to interface between 5V logic,
+such as a 7-segment decoder,
+and the Panaplex display.
+They were popular in test equipment like multimeters and frequency counters,
+and also appeared in consumer electronics such as calculators and clocks.
+The calculator displays were generally smaller and sometimes combined eight
+Panaplex digits into a single glass envelope.
+For more photos of Panaplex displays, see this Flickr photo group:
+<A HREF="https://www.flickr.com/groups/4488225@N25/">Panaplex Displays</A>.
+<BR CLEAR=LEFT>
+</P>
 <H2>TIL311 Hex LED Display</H2>
 <P>
 <IMG ALIGN=LEFT SRC="til311.jpg" ALT="TIL311 display" WIDTH=200 HEIGHT=273>