Are you sure you installed it in the right direction (if you reverted the direction of the chips, you have probably destroyed them,) and in the right position? (high rom, low rom). Does your computer require jumpers to set? Installing a new TOS may NOT be straightforward, depending on which Atari you have, but the ROMs worked fine when shipped.Hey, i was installed rom TOS 2.06 UK from you and it's faulty - not working ...![]()