The description below is from the book DOS the
Easy Way by Everett Murdock Ph.D.
CLICK HERE
for information about downloading the book.
Type: Internal (2.0 and later)
Syntax:
CTTY (device) Purpose: Changes the standard I/O (Input/Output) device to an
auxiliary
device.
Discussion
The CTTY command is used only for I/O (input/output) devices such as a
monitor.
It cannot be used for peripheral devices such as a printer. However, DOS
does
not check to make sure you have entered a valid device name. If, for
example,
you specify a printer, DOS will attempt to read from the device,
producing an
error condition.
Affects only programs that use standard DOS calls. BASIC and other
programs
that do not access I/O devices with DOS calls will not recognize device
changes
reset using this command.
Valid device names are:
AUX LPT
CLOCK$ LST
COM NUL
CON PRN
Example
To change to another I/O device using the AUX port, enter
ctty aux
To change back to the standard I/O device enter
ctty con
For more information about this command, refer to the downloadable book DOS the Easy Way.
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Easy DOS Command Index