Revenge of Defender

In order to speed up the game on Tandy and PCjr computers without having to resort to only 4 colors, 160x200x16 mode is used instead of 320x200x16. Also, the background does not take up the full screen like in EGA and MCGA modes, so only a portion of the screen needs to be scrolled. (CGA and Hercules modes also only have a background on part of the screen. In these modes not only is it a speed advantage, but due to the more limited color palette the game is easier to see than if a background filled the entire screen.)

256 color MCGA mode runs uncontrollably fast on modern machines. The lower resolutions, however, run a little too fast but overall at a much more reasonable speed. It seems that at the time the developers decided no one could run 256 color mode too fast, but some delay was needed for fewer colors!