Atari Age hosts two sets of copies of the schematics for the Atari VCS TIA (Television Interface Adapter), the custom chip that was used in the VCS/2600 for graphics and sound. One set has sheets at 2048 x 1396 resolution, the other is in a whopping 14400 x 9820 format.
Might be neat to simulate the TIA and other VCS hardware in Minecraft and run a ROM entirely in that world. Why not? Something similar was done w/ the Commandore 32!
Another interesting link – a recent rundown of the TIA hardware.