For $35 USD, this snazzy ROM adapter from will let you switch your original Apple IIGS between ROM 0 and ROM 01, or (even more interestingly) between the beta 2.0 and IIBF ROMs if you’re curious about those. It features a color-changing LED to indicate which ROM is active. Obviously, due to architecture differences, this device isn’t compatible with the ROM 3 or Mark Twain Apple IIGS.

AppleIIGSxROM Adapter