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Adding trackball to built cab
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ahofle:
I guess I misunderstood your initial question...I thought wanted to use the trackball as a "poor man's spinner device" meaning you just roll it left and right for games like tempest (instead of having a separate dedicated spinner control).  MAME (assuming that's your emulator) will only look for input on one axis for spinner games, and it will ignore any up/down movement you accidentally register with the trackball, so no worries.  Is that what you meant?
Turnarcades:
 :-\ If it wasn't for the location of your Ipac, you could have added one in the space between your two players' layouts.

If you choose to do what you say (add it over the top) but can't be bothered to do much building, you can now get USB-wired trackballs that attach using just 4 bolts. The ball comes in it's own housing, but you could easily build a 'top-plate' to bolt it to and just plug it in and out without any messy wiring. Try this link and see what you think:

http://cgi.ebay.co.uk/3-TRACKBALL-USB-PS2-FIXING-BOLTS-4-BLACK-BUTTONS_W0QQitemZ102250791909QQihZ010QQcategoryZ3945QQrdZ1QQcmdZViewItem

This one even includes buttons and a choice of connection.....
Dreamwriter:
Isn't that just the X-Arcade trackball?  They sell them separately now, without the preassembled box.
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