Assuming you have an Atari PCB, that's the ROM at 3D. Remove it, scrape the legs clean with a razor blade, pop it in and give it another try. If that does not work, try a new ROM as suggested.
Assuming you have an Atari PCB, that's the ROM at 3D. Remove it, scrape the legs clean with a razor blade, pop it in and give it another try. If that does not work, try a new ROM as suggested.