Yup, I`ve already tried that. There`s nothing like it on the amiga hardware database, also I found no likeness through google. The switcher has no manfacturer or model markings! It is basically a 10x10cm board that slots into the empty kickstart rom socket, has place for two roms on top, a 74hc74n logic chip, three resistors and the yellow cable. it also has a spare socket for 16 pin chip but nothing is fitted there. Anybody?