Conic Multisport Handheld

[atari2600land]

Am just wondering how many people have this (http://www.handheldmuseum.com/Conic/Multisport.htm). I want to make new games for it, I've already designed an overlay for a new game idea I had, but am wondering if it's worth it or not. Each game would come with instructions and an overlay.

[Steve W]

Aren't the games hardwired inside the unit? How would you get a new game on it in the first place?