While there is no single official "Pong" cartridge for the original Atari 2600 , the definitive "ROM" equivalent is Video Olympics
Atari SA (the current rights holder) maintains that copyright on their classic library is still active. Downloading ROMs for games you do not own a physical copy of is technically illegal in most jurisdictions. However, the enforcement of 40-year-old ROMs is virtually non-existent, and most preservationists operate under the "abandonware" ethic—arguing that since these games are no longer commercially sold by Atari, downloading them is morally acceptable for preservation and historical study. pong rom atari 2600 link
A unique technical feat where the entire game runs in the console's 128 bytes of RAM. Link: Thomas Jentzsch's ROMs on the AtariAge Forums . While there is no single official "Pong" cartridge
Pong (Homebrew).bin file from a search result..bin file.