Intriguing. My guess is that trag would be your natural ally in this endeavour, with his IIfx SIMM experience. On that topic: a 64-pin SIMM adapter that lets us use 30 or 72 pin RAM in those puppies would be a boon, indeed. AFAIR, once you get past 72 pins, you run into weirdness on board the SIMM/DIMMs themselves that complicates things, but no doubt trag would have (or has in the past had) more to say on that than I could usefully add here. I also STR there was more to the 64 pin DIMMs than a mere change of pin count.