Tried setting it in MAME, yes. I hit enter to set the key, then try spinning, then nothing. Then have to hit esc, which then shows "Mouse X" again. I've tried disconnecting the PC mouse but get the same result. Is there some way of setting up a spinner in the WiniPac util? When I try the 'test controls' option in WiniPac, all the other controls flash up, ie. joy up/down, P1/P2 etc, but nothing happens with the spinner.
Tried adding a trackball/"other control" to the CP in WiniPac but still no joy.
PS. Have mailed Andy Ultimarc to see if he has any clues.