Invert Trackball Directions

[maffewl]

Looks like I accidentally installed the trackball upside down. 

Instead of having to undo the mounting brackets and cutting a new hole for wiring, is there a way I can just invert the trackball directions in windows or mame?

 

[PL1]

Swapping the two data lines on each axis should do it IIRC.

X1<==>X2

Y1<==>Y2

Leave the 5v and ground wires as is.


Scott

[maffewl]

Sorry, I should have mentioned that it is connected through PS2.  I guess my only option is to un-mount and start drilling.   

Thanks though PL1

[PL1]

It still uses opto boards, or does it have the encoder on the same PCB?


Scott

[maffewl]

I'm really not sure what any of that means?  Sorry, I'm new to most of this stuff.

[PL1]

The trackball works like a mechanical mouse.

Further details and better pictures here and there's an explanation of quadrature waveforms here.

There are 4 wires per axis leading to the encoder:
1. 5v - operating voltage for the LED
2. Data A
3. Data B
4. Ground (Sometimes jumpered inside the trackball case, leaving one axis with only 3 wires)

By swapping Data A for Data B, you are swapping quadrature waveform A for waveform B which the encoder translates as turning the other way.




Scott

[BadMouth]

What he's saying is swapping two of the wires coming from the circuit board will reverse direction.

If you're not comfortable with that, you can invert the axis in MAME.
In the in game menu (TAB by default), go to analogue controls and there should be an option to invert axis.

There should be a line for it in the mame.ini file that will do it globally for all games, but I'm at work and don't have it to look at.

It will still be backwards for everything outside of MAME.

[maffewl]

Thanks for the help everyone.  I decided it would be easier for me to just disassemble the control panel and drill a new hole on the other side of the trackball bracing.  I am wanting to update my artwork anyways, so this will give me a chance to do so.  Again, much thanks!