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I seem to remember one of the TRS-80 Basic manuals being a bit silly too. A lot more so than you'd expect from Radio Shack, anyway.

Found it: https://archive.org/details/Getting_Started_with_TRS-80_Basi...

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On page 10, there is a suggestion to enter "STUERBPORAIYSIES!", then enable double-size mode. I can't find any reference for that anywhere. I wonder what it does?

It looks like in double-size mode, every other character is dropped. The manual text hints at the result. "Something strange? Well, just for fun, press CLEAR then type STUERBPORAIYSIES. Now press SHIFT ->. Surprised?"

Oh, I see. The characters get dropped in the transition between normal and double-sized mode.

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