3vi1

The reason the games don't work on an IntyII is that they don't have a valid year stored in the memory location used by Mattel's generic title screen routine, which is understandable since the Tutorvision or the games appear to use a custom title screen with no dates. That's how Mattel shut out Coleco too.. I read about it on the Blue Sky Rangers site, I think, long ago. It was even a hush-hush thing around Mattel, as they had to let some developers (like those making Burgertime) in on the secret to getting games working (i.e. put a valid date in those memory locations, even if you don't display the generic title screen).