
So I'd like to make a set of gerber files as close to the original as my CAD program allows me to. (Those darn curved traces on the top

I don't have a ZX80 yet (one is coming my way, but it is still in transit. Woohoo!) So I have a few questions some of you might be able to answer.
One of the things I noticed is that the 74LS93 (IC21, char row counter) has an additional pin (#CKA, pin 14) which seems to be unconnected. Is this correct? I know the first part of the counter is not used, but I guess a floating input is not the best solution.
According to the schematic, A6 is connected to #INT. So why does the edge connector still has both of these signals available? Any idea? Btw, my CAD program does not allow two nets with different names to be connected without merging both nets. So what I had to do is rename it to A6/#INT. So this signal is present twice on the edge connector now.
There are some unpopulated parts on the PCB, TR1, R36, R37 etc. I haven't seen any schematic yet that explains what these were intended to do. Any idea?
I hope someone can help me out. For now I still have to rely on the documents that are available. Hopefully my ZX80 will arrive soon...!