On the Apple IIc mouse port, there is a pin that tells the computer that the device it is talking to is a mouse, and not a joystick. It is labeled "MOUSE ID" in some pinnouts. All of the rest of the mouse commands on that DB-9 connector, make sense to me, but that one! What kind of signal is sent down that pin to identify the device as a mouse? Is it just a steady +5v DC? Or is it some timed pulse? Or maybe I have the wrong idea totally!?!? Could someone help me with this?
Thanks in advanced!
~Mark Baldridge
It's almost definitely an input, and probably just loops back 5v or Gnd. If you have a mouse, check for continuity between the pins for MOUSE ID and 5v and Gnd.
The MOUSE ID pin and Button 1 on the Joystick are the same pin. So it cant just be 5v, other wise whenever you press button 1 on the joystick it would switch to mouse "mode". I also dont understand what is expected on this pin to switch between mouse/joystick.
The MOUSE ID pin is connected to ground (pin 3) on the mouse side.