KEDIT v1.50.

KEdit is a program type editor, not a word processor.  Lines are limited
to 127 characters in length.  If a line is too long to fit on the screen, it
may be scrolled left or right.  An inverse video character at either edge of
the screen is used to indicate the line extends off the screen.  Users of
the ACTION! programming language will be at home with this type of editor.

KEdit uses the atari E: device (or a custom E: device).  Even then,
it is still faster than many other editors in most functions.  KEdit works
in 40 columns or 80 columns displaying 38 or 78 column respectively.
(Software 80 columns)