Electronic Games and Hobby projects
http://home1.stofanet.dk/hvaba/gameboy/mbc5cpld/cpldcart.html
http://circuitos.tripod.cl/schem/r50.gif
http://www.ele.uva.es/~jesus/dream/
http://www.massystems.com/DC-VGA.html
on your tv
http://www.geocities.com/CapeCanaveral/Launchpad/3632/bingo.htm