"Pong" is one of the earliest and most influential arcade video games; several home ports and clones exist for the Atari 2600 platform. On the Atari 2600, "Pong" variants include licensed ports, Atari's own TV Games adaptations, and multiple homebrew or hacked ROMs that replicate or extend the original arcade gameplay. This report summarizes history, technical details, common ROM formats, legal considerations, and how links to ROMs are typically provided.
AtariAge is the largest community forum for Atari collectors. They have a massive database of homebrew and classic ROMs. pong rom atari 2600 link
If you want a modern or simplified version of the game, there are several "Homebrew" projects created by fans: "Pong" is one of the earliest and most