I read that most of these games are ported from MSX.
The story goes that in order to make porting easier the SGM module has a Yamaha music chip that is the same as used in MSX.
Thanks for your concern, my bad for thinking you simply didn't want to bother.
There is no need for such concern, we actually love seeing new users including greetings in their first post.
Jumpland has been added to our coleco game roster.