== CPC Plus Compatibility ==
The circuit reportedly doesn't work on CPC Plus computers. Probably simply because of the missing Fire3 signal on the joystick port of the CPC Plus(this could be fixed easily, by connecting the missing pin inside of the computer). There are also additional diodes in the CPC Plus, which may drop the voltages a little, but probably do not cause problems in this case.
== Software supporting the ST-Mouse ==