I don't usually venture into the console subforum, but I didn't see this already posted.
He does some comparisons of the hardware with the CD add-ons that were on the market during that time period, which I found interesting.
I'll go ahead and ruin the ending for you. He fixes it, but has no CD software to test on it.
The guy says there might be some discs up in the attic where the prototype was found.
Really? You've travelled the world with this thing, but haven't taken the time to see if you had any of the discs for it?
Part 1
Part 2