Controlling Console Output; Controlling Printer Output - Commodore 128 System Manual

This section describes how CP/M 3.0 communicates with your
console and printer. It tells how to start and stop console and
printer output, and edit commands you enter at your console.

CONTROLLING CONSOLE OUTPUT

Sometimes CP/M 3.0 displays information on your screen too
quickly for you to read it. To ask the system to wait while you
read the display, hold down the CONTROL (CTRL) key and press
S. A CTRL-S keystroke sequence causes the display to pause.
When you are ready, press CTRL-Q to resume the display.
Pressing the NO SCROLL key will also pause the system and
place a pause window on the status line at the bottom of the
screen (line 25). To resume the display, press NO SCROLL
again. If you press any key besides CTRL-Q or NO SCROLL
during a display pause, CP/M 3.0 sounds the console bell.
Some CP/M 3.0 utilities (like DIR and TYPE) support automatic
paging at the console. This means that if the program's output is
longer than the screen can display at one time, the display
automatically halts when the screen is filled. When this occurs,
CP/M 3.0 prompts you to press RETURN to continue. This option
can be turned on or off using the SETDEF command.

CONTROLLING PRINTER OUTPUT

You can also use a control command to echo (that is, display)
console output to the printer. To start printer echo, press CTRL-P.
A beep occurs to tell you that echo is on. To stop, press CTRL-P
again. (There is no beep at this point.) While printer echo is in
effect, any characters that appear on your screen are listed at
your printer.
You can use printer echo with a DIR command to make a list of
files stored on a floppy disk. You can also use CTRL-P with
CTRL-S and CTRL-Q to make a hard copy of part of a file. Use a
TYPE command to start a display of the file at the console. When
the display reaches the part you need to print, press CTRL-S to
stop the display, CTRL-P to enable printer echo, and then CTRL-
Q to resume the display and start printing. You can use another
CTRL-S, CTRL-P, CTRL-Q sequence to terminate printer echo.
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