27.12.2 Garbage on the Screen
If the data on the screen looks wrong, the first thing to do is see
whether the text is actually wrong. Type `C-l', to redisplay the
entire screen. If the text appears correct after this, the problem was
entirely in the previous screen update.
Display updating problems often result from an incorrect termcap
entry for the terminal you are using. The file `etc/TERMS' in the Emacs
distribution gives the fixes for known problems of this sort.
`INSTALL' contains general advice for these problems in one of its
sections. Very likely there is simply insufficient padding for certain
display operations. To investigate the possibility that you have this
sort of problem, try Emacs on another terminal made by a different
manufacturer. If problems happen frequently on one kind of terminal but
not another kind, the real problem is likely to be a bad termcap entry,
though it could also be due to a bug in Emacs that appears for terminals
that have or lack specific features.
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