Atari Atari Atari Punk Punk Punk Console Console Console

Hello folks, has anyone tried to build one of these from scratch yet? I’m plotting things out in Kicad, and noticed that one of the 556 halves has an unused “Q” output. Is that right? Is just the DIS output being used by later stages in the cascade of chaos?

(Schematic: https://static1.squarespace.com/static/5912db7ee6f2e1435dbab4fd/t/5f660a04179c39639dee8bbf/1600522761044/Untitled.jpg)

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