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

Section 3
Console and Printer
This section describes how CP/M 3 communicates with your console and printer.
It tells how to start and stop console and printer output, edit commands you enter
at your console, and redirect console and printer input and output. It also explains
the concept of logical devices under CP/M 3.
3.1 Controlling Console Output
Sometimes CP/M 3 displays information on your screen too quickly for you to
read it. Sometimes an especially long display scrolls off the top of your screen before
you have a chance to study 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 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 sounds the console
bell or beeper.
DIR, TYPE, and other CP/M 3 utilities support automatic paging at the console.
This means that if the program's output is longer than what the screen can display
at one time, the display automatically halts when the screen is filled. When this
occurs, CP/M 3 prompts you to press RETURN to continue.
3.2 Controlling Printer Output
You can also use a control command to echo console output to the printer. To
start printer echo, press a CTRL-P. To stop, press CTRL-P again. 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 pr inting. You can use another CTRL-S, CTRL-P, CTRL-Q sequence to
terminate printer echo.
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