[userbinator]

I believe the transistor-level simulation came from these images:

http://www.visual6502.org/images/pages/Atari_10444D_TIA.html

There are gate-level schematics for the TIA too:

https://atariage.com/2600/archives/schematics_tia/index.html

[frakturfreund]

I didn’t know the chematics for the TIA, thank you very much!

I find this Chip quite intriguing because it's so minimal; its stunning how much could be archieved even under the hardest restrictions. Or how little, compared to later graphic chips of the 8-bit era (like the PPU of the NES).