The original post said only 2 carts were made, but that isn't quite correct, as the box has pictures of many more carts and other software. I listed everything from the box in hash\pencil2.xml
With the unit I received 6 cassettes with demo programs. These have been extracted and are on my site which I'm sure you can find. There's a manual there too.
You are wright for the tapes, i have found them in an old lost forum and archive them too 😊 But for the cartridges I've always heard about 2 only games and one cartridge for the sdbasic 2.0. Maybe sdbasic 1.0 exist but i' m not sure.
What is exciting is to learn that more things exist and can be fonctionnal. I just read the xml and I'm just so happy to see that there are well known games as on colecovision.
Hope that somebody could find them and archive them.