Two cases like that actually. First is Midway Manufacturing Co. v. Artic International, Inc. and the second is Williams Electronics, Inc. v. Artic International, Inc., 685 F.2d 870 (3d Cir. 1982). Artic was selling Defender like ROMs with extremely similar code (we're talking pixels here) on them so others could make bootleg copies. Their argument was that the code or presentation was not copyrightable. The visible element or attract screen, Artic said, was not "fixed." The court, in both cases, held that it was fixed because the code was in the chips from which it can be perceived using the other game components.
Those cases, at least Williams, is still taught in law school today.