Type: Internal (2.0 and later)
Purpose: Changes the standard I/O (Input/Output) device to an auxiliary device.
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:
To change to another I/O device using the AUX port, enter
To change back to the standard I/O device enter