RevEng has ported the classic computer game
Serpentine from the A8 to the 7800. The port is playable and complete, though some additional features may be added to the game in the future.
(http://i1303.photobucket.com/albums/ag160/TrekMD/Serpentine_zpsvpzxfrxt.png)
The game requires a POKEY @$450, and additional RAM @$4000. For now, that limits real hardware to the MCP Dev Cart or XBoard. The new Harmony cart will be able to support it too. Emulation is probably limited to newish versions of MAME/MESS.
http://youtu.be/-FTsNno0PwQ
For those of you unfamiliar with this game...
The goal is to eat the other serpents and avoid being eaten. Head-on collisions with snakes that aren't smaller than you will result in death. You can grow by eating frogs, eggs, and smaller snakes head-on. You can eat the tail/side segments of snakes of any size.
Your snake and the enemy snakes will periodically lay eggs. The enemy eggs hatch fairly quickly into new enemy snakes. Your egg only hatches at the end of a level, at which point it will give you an extra life - until it hatches, your egg is vulnerable to being eaten by enemy snakes and frogs.
Development Thread (http://atariage.com/forums/topic/258291-serpentine-7800/)