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Re:Old School Color Cycling with HTML5 by jacquesm on Sunday July 25, 2010 @05:25PM (#1546390)
For bonus points, change the graphic mode on the fly by counting h-retraces and get both low-res + colour and high res in the same screen.
Re:Old School Color Cycling with HTML5 by bluesmoon on Sunday July 25, 2010 @06:11PM (#1546473)
Mode-X anyone?

http://www.gamedev.net/reference/articles/article373.asp

which also tells you why Michael Abrash is God