How rare is the Tutorvision? Maybe its not as rare as you think.   Here is possibly a photo of the Tutorvision mainboard. This photo came from here. http://forum.arcadecontrols.com/index.php?topic=144540.0 And more info on that board here. https://console5.com/techwiki/index.php?title=INTV_System_3 It looks just like this photo of a Tutorvision here. http://old-computers.com/MUSEUM/photos.asp?t=1&c=1214&st=2   Its marked 1988 INTV but Its missing the combined STIC/ram/sound ch