A divergence into solid state. While browsing Danny's site at danny.cdyn.com, I noticed he had some photos of the internals of the Magic Screen bingo manufactured by Sirmo in Belgium in 2005.
This is a solid state bingo with a very interesting boardset - using what appears to be PC hardware in a pinball machine, including multiple LED and an LCD monitor, manufactured almost a decade before Jersey Jack's Wizard of Oz - simply astounding!
I'm looking forward to spending a lot more time on a solid state bingo in the future, and part of the fun of any machine, for me, is knowing how they work.