That's interesting, I'd thought they would. The pinouts on the ports would appear to be the same, since they can share joysticks. However, it also makes since when you consider the fact that you've got to flip a switch to use the mouse in question on either the Amiga or Atari. My guess would be the computers expect different signals, despite the fact they're using the same pins. I seem to remember seening a picture of a C-64 mouse and it looked just like a Amiga mouse. If it's a "Wizard" mouse, it's a great mouse by the way, it looks and pretty much feels horrible though. I've got one on my A3000, despite having several Amiga mice scurrying about. I've not tried it on my Atari though, but I've been meaning to. Zane | Zane H. Healy | UNIX Systems Adminstrator | | healyzh(a)ix.netcom.com (primary) | Linux Enthusiast | | healyzh(a)holonet.net (alternate) | Classic Computer Collector | +----------------------------------+----------------------------+ | For Empire of the Petal Throne and Traveller Role Playing, | | see http://www.dragonfire.net/~healyzh/ | | For the collecting of Classic Computers with info on them. | | see http://www.dragonfire.net/~healyzh/museum.html |