From: utzoo!utcsrgv!newman Newsgroups: net.games.video Title: 5200 accessories Article-I.D.: utcsrgv.1156 Posted: Wed Mar 9 15:37:54 1983 Received: Wed Mar 9 15:46:17 1983 As far as I know, the 5200 can use the 400's accessories with no problems (and probably the ROMs too). There are at least two trackballs available in the stores here (Toronto Canada) so they're bound to be available in the US. Wico makes one; so does (I think) TG Products. As for the non-centering joysticks, there are many centering ones usable on the 5200. Has anyone successfully used 5200 cartridge ROMs in a 400 or vice versa?