Wow! I used to love these! It's been a few years though, can someone clear up for me are those diodes (And therefore should be ignored)? Or inversions (x*-1)?
EDIT: Diodes can face either direction though, depending on if you want a feedback loop or not. You are correct about the line however, I should have remembered that.
Thanks for all your replies, but ive still got no idea on how to convert this circuit into decimal format. Can anyone help me? Or at least point me in the right direction? Cheers!