+*http://www.youtube.com/watch?v=EJlgik3ho48 Testing The 74LS138 Decoder
+*http://www.datasheetarchive.com/UA556PC-datasheet.html 556 Timer Datasheet
+*http://www.datasheetdir.com/74HC164+Shift-registers 74HCT164 8-bit Serial-in, Parallel-out Shift Register
+*http://www.datasheetcatalog.com/datasheets_pdf/D/M/7/4/DM7445N.shtml DM7445 BCD to Decimal DecodersDrivers
+
+* http://chung.yikes.com/~leonard/mirrors/ti99/9900story.html
+
+Data Display UK Ltd
+
+* http://uk.linkedin.com/pub/ray-frost/22/415/a80
+* http://www.datadisplayuk.com/products/LED_datalines/
+
+* http://www.datadisplayuk.com/support/
+
+"We offer a full support service for the following products:
+[..] Some products purchased from IGG systems, which was acquired by us in 1996" :-)
+
+* http://www.datadisplayfrance.com/program/log/telecharge.htm