I have a used J-Pac and I-Pac for sale. I have replaced the monitor in my arcade with a tube from a TV, so I no longer need the functionality of the J-Pac and I recently purchased a set of new controls that came with game interfaces, so I no longer need the I-Pac either. I had the two in a single cabinet to run 4 Players. They work perfectly. I plug the I-Pac into the J-Pac and the J-Pac into the computer. I am pretty sure one uses the PS2 interface and the other USB, and once connected to each other it connects to the USB port on the computer.
I have had these for about 5 or 6 years and they have had very little use, as the arcade is mostly only used when there is a group of friends over or during parties.
These will include all of the cables needed to connect to each other and the computer. They are programmed for 4-players as a set but can easily be reprogrammed with the free software from Ultimarc.
$50 for the pair or $25 each. Free shipping in the US.
Jeff Green