These seem to be well received over on KLOV.
http://www.riddledtv.com/arcade/jamma_switchers.html
I'm planning to buy one at some point.
Yeah, I've been considering these ones as well. I like that they supply -5v to each board...but are all the boards powered at the same time?
Just wanted to answer my own question. Here's the features list from the manual:
Supports 2, 4, 6, or 8 JAMMA boards
Only 1 JAMMA board is powered at a time.
No external remotes required
Games are switched by holding Player1-Start and Player2-Start for 1.5 seconds, or alternate
buttons can be connected.
Supports 6 button inputs per player
Supports up to 20 Amps on 5V
-5V power is switched for each board
JAMMA extension harnesses are typically not needed.
This is a very nice feature-set and hits every requirement I was looking for. Not only supplying -5v, but switched -5V per board is really nice. Also dig that not all boards are powered at the same time, AND that you can set an alternate dedicated button for switching between boards.
Looks like I'll have to pull the trigger on this one!