Commodore 128D - Page 215

Controlling
Console Output
/ \
Controlling
Printer Output
Console Line
Editing
This section describes how CP/M 3.0 communicates with your con
sole and printer. It tells how to start and stop console and printer
output, and edit commands you enter at your console.
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 key
stroke sequence causes the display to pause. When you are ready,
press CTRL-Q to resume the display. If you press any key besides
CTRL-Q during a display pause, CP/M 3.0 sounds the console bell.
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.
Some CP/M 3.0 utilities (like DIR and TYPE) support automatic pag
ing 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.
You can also use a control command to echo (that is, display) con
sole output to the printer. To start printer echo, press CTRL-R 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 charac
ters 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.
NOTE: Not all printers will respond properly to the CTRL-P
command.
As noted previously, you can correct simple typing errors by using
the INST/DEL key or CTRL-H. CP/M 3.0 also supports additional line-
editing functions that you perform with control characters. You can
use the control characters to edit command lines or input lines to
most programs.
207 USING CP/M MODE—Using the Console and Printer in CP/M 3.0