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    I remember leaving a vi window open on my AT&T 3B1 “UnixPC” because I didn’t know how to exit it.

    Years later, I wrote chapters on how to use vi for a couple of Solaris certification study guides :D

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        Also, some interesting info with some source code at: http://www.classiccmp.org/cpmarchives/cpm/Software/rlee/M/MORROW/MICRONIX/

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