i dont have extra adapter but planning to make myself a new one soon, i will let you know when i do. what i wonder is what is the megaplay cartridges look like, i think pcb's are similar but their bios files are different, its interesting that sonic2 works on both systems. I used sonic1 bios on the converter but maybe sonic2 bios can make it run on megaplay. Do you have any megaplay cart that you can take photos of inside?