Originally Posted by switchblade
From what I've seen of the Mega Drive, only one game was ever produced on that system to use a custom chip inside the cartridge. That was Virtua Racing with that SVP chip. Unfortunately, putting special chips inside cartridges only increases the cost and complexity of the cart.
Last time I checked, Virtua Racing for Mega Drive was being sold for USD $100 (probably around £60-65 when released in 1994); the most expensive Mega Drive game ever sold.
I also think Virtua Racing was the only game that used the SVP chip, I always wondered in the case of the Megadrive if it would handle Microprose's Grand Prix as well as the Amiga does. I think the Amiga did a very good job of handling that title the first time I played it.