DIGITAL RESEARCH(r) CP/M Plus TM (CP/M Version 3) Operating ...

The ED Command CP/M 3 User's Guide
Any single letter commands typed in insert mode are not interpreted as
commands, but are simply stored in the buffer. To return from insert
mode to command mode, press CTRL-Z or the ESC kev. Note that
you can always substitute the ESC key for CTRL-Z in ED.
The single letter commands are usually typed in lower-case. The commands
that must be followed by a character sequence end with CTRL-
Z if they are to be followed by another command letter.
Any single letter command typed in upper-case tells ED to internally
translate to upper-case all characters up to the CTRL-Z that ends the
command.
When enabled, line numbers that appear on the left of the screen take
the form:
nnnnn:
where nnnnn is a number in the range 1 through 65535. Line numbers
are displayed for your reference and are not contained in either the
buffer or the character file. The screen line starts with
when the CP is at the beginning or end of the buffer.
Examples: A'>ED MYPROG,.PAS
If not already present, this command line creates the file MYPROG.PAS
on drive A. The command prompt
appears on the screen. This tells you that the CP is at the beginning of
the buffer. If the file is already present, issue the command
: *
to fill the buffer. Then type the command
:*#a
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