i have a membership, I've been to the exhibit a couple of times.
There is an EM machine running, can't recall the name. They also had a BOP on display but was powered off both times I was there. It may never be on, since it was part of a "museum" of classics that were mostly dead games with no power.
100+ console games from all eras and maybe 20 classic arcade cabinet games... Tron, DK, Track & Field, Buck Rogers, can't recall the rest.
I plan to go with my wife sometime during the day when its dead to get on some of the classic vids. When I'm there with my kids I have to watch them so no hands-on time for me.