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Original Pong did not have any code or even a microprocessor
Here is a link to full schematics. Thanks to whoever made this. I just found a few issues with it. The CLK input to the 7474 on page 2 should be HRESET, not CLK. Pin 5 of the 555's on pages 5 and 6 should be connected to the capacitor. Also some of the nodes are inconsistently labeled.