Robocop3 (disassembly again)
Pulse Firebutton line
JOY1DAT bit 8 must change state (either 0 to 1 or 1 to 0)
I guess this dongle is only a simple wire (!) between fire (left mouse button) line and either left or forward joystick line. Pulse basically increases mouse counter by one. (mouse counter low bit toggles)
btw, I expected something more complex..