PS/2 Mouse adapter for Atari ST/Mega/STe

If you have lost your original ST Mouse or you want to use some new (-ish) trackball or mouse, then look no further (farther?) LONGER!

This adapter will let you use any PS/2 compliant mouse.  ALSO, if your mouse came with a USB to PS/2 adapter, then you can probably use that mouse with this adapter on your ST or Mega ST or STe or Mega STe