Mouse

This a standard 2-button ball mouse. A few 64DD games support it:


 * Mario Artist: Paint Studio
 * Mario Artist: Talent Studio
 * Mario Artist: Polygon Studio
 * Mario Artist: Communication Kit

Most other N64 games see the mouse as a controller, and a few of them are playable like this. Mouse movements register as analog stick movements. The left button maps to the A button, and the right mouse button maps to B.

There is a single microcontroller that handles everything.

This mouse appears to be based on contemporary Mitsumi PS/2 mice, which have nearly identical guts. Closest match is the ECM-S3902