> From a couple quick U-boob viewings of actual cabs, I've come to the conclusion that
> it depends on the machine as to how the P1 & P2 lights flash...
> -This 1 seems to flash alternatively (hard to tell for sure)
> while the rest of them all flashed in unison. https://youtu.be/OE7BZAq8Noo?t=47s
> -But, on all of them the P1 button stayed on after hitting it to start the game. I
> couldn't see on any of them if it switched to the other button & glowed as the
> players changed or if both of them came on & stayed on. (but I seem to recall it did
> the former...)
> So no definitive answer here.
> Have you tried all the different versions? Do they all work the same now?
All sets in MAME have concurrently flashing LEDs except for asteroid1, which has the alternately flashing lights.