Very interesting, thanks for posting! I'm working on-and-off on a fantasy console side-project that is based on the same ideas used for home computers from the 8-bit and 16-bit era, and the interaction between the CPU and video chip (in terms of clocks, memory access, interrupts, etc) is something I still haven't completely figured out in my head. This article does an excellent job explaining how these kinds of things worked, great stuff!