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Invert Trackball Directions
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!
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