Wow, nice to see someone else taking up the discrete emulation torch!
Interesting choice of Space Race, that was one game I tried to add to DICE back in the day but was never able to get it working fully. If I recall, I think I got everything except the stars circuit working properly. I wasn't sure if it was due to all the errors in the schematics (I found most of the same ones), or if it was due to inaccuracies with the simulation - I was using unit gate delay, so every single chip had the exact same delay, which was accurate enough for Pong, but probably not accurate enough for the more complex games. What kind of method are you using for the gate delays? I always planned on starting over from scratch with a more accurate and faster simulator, but never got around to it. So I'll be interested to see if you're actually able to get this working.
And what kind of speed are you getting?
Adam
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