Good idea sounds too complex for me though
Buy 2nd I-PAC 2 -
Move Jumper to ALT
Plug in and program to match settings you would use for I-PAC/4 Players 3 and 4. Wire to Players 3 and 4.
Program and wire up existing I-PAC/2
Plug output cable of 2nd I-PAC/2 to keyboard Pass-thru port of existing I-PAC.
MAME away!
Still sound too complicated ? -
Basically there are only two differences between this and the I-PAC/4 -
1) You have two separate boards with a cable connecting them, instead of one board.
2) You cannot directly program the Player 3 and 4 inputs, you have to plug the second board in and program it, and then connect it back to the pass-thru.