Wickeycolumbus has seen a lot of 1k games for Atari 2600 recently, so he thought to make one up the half size.

Release notes:

I’ve been seeing a lot of 1K mini games lately, and I wanted to take a stab at making a game with a small amount of ROM. I managed to squeze Pong into only 511 bytes (one byte to spare!). It is 2 player only (no room for AI) and uses joysticks and no sound (no room for that either). It took me a couple of hours to complete. Here is the Binary and Source. Enjoy!