Retrothing has a paen to the Cambridge Z88, a clever little device made in 1987 that ran for 20 hours on four AA batteries. I honestly don’t know of a single device I own that can run that long. Besides a word processor you also had a version of BASIC built-in and a nice little LCD screen with big keyboard. Sure the 640×64 resolution is a little rough, but what more do you want?
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