While I was restauring an Amiga 1200, I noticed that on that machine, the right and middle mouse buttons did not react on both ports. Checking it further, it turned out that it was working with an original Amiga mouse, but failed with my YAMI mouse interface. The mouse interface could not be the cause though, as it is actually working reliably for decades on all kind of Amigas, including an Amiga 1200.
