These documents shed some light on the subject:

http://docs.info.apple.com/article.html?artnum=6383

http://docs.info.apple.com/article.html?artnum=7522

http://docs.info.apple.com/article.html?artnum=136

THis last article indicates as mentioned on other sites that the IIc/+ had a mouse ID signal on pin-1 in order to differentiate between a joystick and a mouse. THe Macintosh mouse jumpers pins 1&3.

Scott Baret mentions above he uses the IIc mouse on his Macintosh. Is it the A2M4015 or is the the earlier M0100 listed as Style 3 at this link?: http://www.decodesystems.com/apple-mice.html

I find it interesting that a different pin wiring will work on the Macintosh but not on the IIc.

Does anyone have an original IIc Plus (Platinum) mouse? I am curious if the A2M4015 was changed to platinum or if they simply used the Macintosh Plus mouse design across the board.

I am equally curious as to why they would give the obviously uniquely wired, styled & coloured IIc mouse the exact same model number as the Macintosh.

Lastly, I wonder why Apple chose to stick with the original Macintosh mouse design when they released the Plus (which was modified by Frog Design), rather than update to the IIc design mouse (designed by Frog). Is the Macintosh design preferred to the IIc design by most people?