There are two vendors for the mouse that works with the Macintosh Plus and
Apple II line. If you switch mice between systems, the mouse may not
work.
One vendor's mouse works with both lines, and the other works only with
the Macintosh Plus:
- The mouse identified as "Made in the US" works on both computers.
- The other is identified as "Made in Japan".
All service stock is of the compatible version (P/N 661-0400).