I just got Dunk 'N Sunk. It's a basketball game... It's a submarine chase...
CPU is a 40-pin DIP, just house markings: GE-E 1V2280 8001
Pinning it out, it's another Rockwell PPS-4/1; MM76L or MM76EL, depending on the amount of ROM space (probably EL, since L just has 640 bytes, and EL has a whopping 1K).