In the schematics of Atari Space Race (http://discrete.mameworld.info/Atari/Spacerace/SpaceRace.pdf) there is on the second sheet in the area A/B and 3/4 a net of 4 connections to only inputs of gates. F3 pin 2+3, D4 pin 9 and H1 pin 1.
Does anyone have an idea what could be missing here? A signal name or a connection - to what signal?
My best guess is that the carry output of E5 (pin 15) should go to this net, while it seems unlikely the little piece of line was missed. Any other ideas?