I started compiling the results from http://www.atariage.com/forums/index.php?showtopic=75267 and http://www.atariage.com/forums/index.php?showtopic=83072 as well as http://www.digitpress.com/eastereggs/pnpflashback2.htm into one big table. The result:   http://kennedy.greg.googlepages.com/fb2compat.html   Comments and corrections welcome - especially for games listed as "Conflicting Reports". I am curious if some of these are not really issues but actually replicate flawed 2600 behavior..