Yeah Tone... you can "mod" any cards backplane by drilling a hole into it and adding a switch. lol Helps if you have a Kickstart switcher too... :lol:
This looks pretty cool, but more info would be nice. What's curious about this board is that there's no circuitry on it at all (unless its all on the underside). No way that simple switch (can't see how many poles it has) is enough to entirely deactivate the other ROM... is it?