Some nifty docs for anyone looking into making games for the ColecoVision, SG-1000, and possibly even the SEGA Master System (apparently the graphics chip in the SMS was modified to display more colors):

http://www.cs.columbia.edu/~sedwards/papers/TMS9918.pdf

http://www.z80.info/zip/zaks_book.pdf

http://soundprogramming.net/electron...9datasheet.pdf