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The downside of a real tech-tech, is that it requires more characterSETS for the logo, as you can switch those each rasterline as opposed to the character position. 
 
So the reason why real (+8 pixels) tech-techs are rare in intros, is that they consume a lot more RAM. (You don't need to save all the sets to disk, easy enough to 'generate' them)
 
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