Here's a great older example of this technique (and a couple others) used on the TRS-80 Color Computer 3 to show "hi-color" bitmaps on a machine with a 16 color

Here's a great older example of this technique (and a couple others) used on the TRS-80 Color Computer 3 to show "hi-color" bitmaps on a machine with a 16 color palette: http://users.axess.com/twilight/sock/hicolor/hicolor.html http://users.axess.com/twilight/sock/hicolor/hicolor.html