I have also been considering doing this, so I have been paying attention when hardware comes up for sale. I believe there are two types of 044 boards, one for Game King and a different one for S2000 slots. Maybe it's just the mother boards that are different, not the MPU? I am not sure. Need advice. I also like to swap out the Game King software for variety, and would want to keep using the 3902 EPROMs, but I understand that the SIMMs and Flash boards are not easy to backup, in case of accidental damage while swapping. The EPROMs are easily backed up with a cheap programmer.