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custom optical mouse to trackball conversion?
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Trimoor:
I posted this idea about a year ago.
The axis thing tuns out to be normal, no reversal needed. (mame can do that anyway though)

The mouse I tried doesn't like my white imperal though.
It registers nothing.
jswhale:
I have an optical mouse working with a spinner I made out of an old HD.  I had to use a design stuck to the spinning plate (actually one of the HD platters!) to ensure it was reading correctly.  I think you'll have the same problem with a trackball since it's harder ensure that the optics can pick up movement accurately - particularly with the faster speeds you will find with a trackball.
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