In an earlier post you mentioned the ColecoVision having better resolution (at least in some ways) to the Atari 7800, which is one reason your version of Pac-Man looks so good so far.
What are the comparitive stats between them? I always assumed that the ColecoVision had better sound (as did most systems), roughly equal ROM for the cartridges (32K), but inferior visuals (e.g. 16 colors as opposed to 256, and 1-color sprites).
As a point of reference, I fully understand what 200X320 with 16 colors is (the Commodore 64).