2600 new PCB?

[+SvOlli]

I started doing my first little project using KiCAD. But now I want to go for something slightly bigger. Since quite some time, I also want to do my very own flavoured 2600. So instead of going for a route like Ben Heckendorn with his super soldered 2600, I want to design a new PCB for the three original chips with options for changes like replacing the 6507 with a 6502. And maybe replace the cartridge slot with a soldered in UnoCart 2600.

 

To accomplish this, I'd like to get some circuit diagrams. I know the original ones are around (I have them on my harddisk somewhere), but those contain some stuff that I don't want to replicate like the HF modulation stuff. Has already someone done some trimming done on the original diagrams or created some stripped down version?

 

As with all my stuff, if I really get something done, it will be completely open, so anyone can modify it and order new 2600 PCBs.