I have both chips for the fixed 7800 Impossible Mission. While they fixed the original bug they introduced a new one. The new bug involves the bonus game that gives you free items when you win. After a couple rounds it will tell you that you entered the wrong sequence every time. Even if you got it correct. That may be the reason it didn't get released. I posted the ROM out on the internet a few years ago, if anyone wants to try in an emulator.
Also, Commando used a Pokey sound chip but no extra on cart RAM.
It's great to see this stuff, I hope you can find more working games.
Mitch