I finally had a chance to build a Plus ROM adapter today and try it out. Unfortunately it was a lot tougher than I expected, and I couldn't get it to work. I didn't anticipate the trickiness of soldering four rows of headers on the bottom of the board and two DIP sockets on the top, while keeping everything perfectly aligned so it would fit in the motherboard's ROM sockets. Mine was a little off, and I couldn't get it to fit right. I also had trouble running clips to the address lines on the CPU. My RAM SIMMs are slightly taller than what I think is standard, and the last SIMM blocks enough of the CPU that it was impossible for me to get the clips to stay on when the SIMM was installed. Then to add insult to injury, I couldn't even fit the motherboard with ROM adapter back inside the chassis, because it collided with the cross-piece at the rear just above the motherboard slot. Arghh! I did finally bend and wiggle it in there, but when I hooked everything back up the machine wouldn't boot.  It's still an awesome idea, just not quite as "plug and play" as I'd hoped. I'll chill out and try again with another board later.