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From: Lars Brinkhoff <lars@nocrew.org>
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Subject: Re: Changing line widths in the Emacs source code
Date: Tue, 15 Sep 2020 08:53:51 +0000
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Lars Ingebrigtsen wrote:
> Emacs has tried to keep the line width of the source code at 80
> characters since Emacs was created.

Historical side note: The AI Lab PDP-10 on which the first Emacs was
created had Datapoint 3300 terminals that were 72 characters wide.