[tdeck]

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

[watersb]

Wow. Thanks! This CoCo is still teaching me. Love that thing.