- Joined
- Mar 8, 2002
- Posts
- 3,686
I tried the trackball on a 4-slot today and it didn't work. The 8-pin harness was connected to the joy ports as shown in the pic:
http://img142.imageshack.us/img142/7912/im8pinharness6vc.png
Note that the pin functions are reversed on the interface (ground is pin 1 on the mobo but pin 2 on the interface, etc.), in the 1st post Raz uses the pinout on the mobo.
As I suspected, when the trackball is connected to the P1 input pins (on the jamma connector) a joystick plugged into the P1 joy port doesn't work. This is a problem because you have to use normal controls to enable the trackball cheat. To solve this I made the connection from the interface to the mobo disconnectable, however after the cheat is on and the trackball interface connected back to the mobo the trackball doesn't respond. The trackball is the official one that came with the IM kit and I know it works (I tested it on a Forgotten Worlds PCB).
I'll try again on the MV-1C (a mobo that, like the MV-1B, has trackball support) once I've made a harness for it. I'm not sure whether to leave pin 2 (= pin 7 on the interface) disconnected or not though.
http://img142.imageshack.us/img142/7912/im8pinharness6vc.png
Note that the pin functions are reversed on the interface (ground is pin 1 on the mobo but pin 2 on the interface, etc.), in the 1st post Raz uses the pinout on the mobo.
As I suspected, when the trackball is connected to the P1 input pins (on the jamma connector) a joystick plugged into the P1 joy port doesn't work. This is a problem because you have to use normal controls to enable the trackball cheat. To solve this I made the connection from the interface to the mobo disconnectable, however after the cheat is on and the trackball interface connected back to the mobo the trackball doesn't respond. The trackball is the official one that came with the IM kit and I know it works (I tested it on a Forgotten Worlds PCB).
I'll try again on the MV-1C (a mobo that, like the MV-1B, has trackball support) once I've made a harness for it. I'm not sure whether to leave pin 2 (= pin 7 on the interface) disconnected or not though.