The ROM3 motherboard is different. So, this requires a mother board swap. IMHO, your best bet is the memory card from Alltech. -- Thank you for your time and interest. I hope it was helpful or at least interesting. Phoenyx, Apple2 user since March 1984 Links to Phoenyx's pages: preferred..... http://zip.to/Phoenyx_A2 alternate..... http://www.tinyangeldesigns.com/Apple2