Just wanted to share here today that I've managed to find the best method for getting a mouse working on quite a few 5200 games- 1 and 2 button 5200 games.  Here's what you need:   1) A Masterplay Clone that doesn't only make Atari joysticks compatible with the 5200 but has 2-button game compatibility designed to get Sega Genesis controllers working (mine was the 2016 model made by Atariage member, Atariguy1021)    2) A Commodore 64 mouse (model 1351)   3) a 9 pin s