I did email Randy and he gave some advice, like check wiring, maybe a virus,...
It sort of works now ie. I am able to change the button defenitions, but still most of the time it is not able to connect, maybe 1 out of 5.
I just tried my first game on my 'not quite finished cab'. Buttons worked, but joysticks didn't. I'm sure it's a mame configuration problem, but couldn't figure out what it was yet. Cannot wait to finish the cab and make the joysticks work.
Also my happ trackball -mouse hack didn't work (tried a ps2 and a usb mouse).
Maybe someday...