Tons of additional information here from an Atari staff engineer who worked on some of the XY games. [1] [2] [1] https://www.jmargolin.com/vgens/vgens.htm http

Tons of additional information here from an Atari staff engineer who worked on some of the XY games. [1] [2] [1] https://www.jmargolin.com/vgens/vgens.htm https://www.jmargolin.com/vgens/vgens.htm [2] http://www.jmargolin.com/xy/xymon.htm http://www.jmargolin.com/xy/xymon.htm