The example here claims the display and the Blitter, but leaves the OS and other programs running in the background. The Copper program needs to modify itself every frame for this to work, and you need full ownership of the Blitter, so I'm not sure you can incorporate this into a regular dragable Intuition screen.
I just posted it here since you guys had a discussion on this technique and I had a working example, it's not really worth using since there are more efficient ways of drawing tile graphics.
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