About printer device connections
Each local printer must have a ``device special file''
associated with it.
Device special files provide an interface to a device
(such as a printer) and its corresponding device driver.
These files reside in the /dev directory.
The default local printer connections are three parallel devices (/dev/lp0, /dev/lp1, /dev/lp2) and two serial devices (/dev/tty1a for COM1 and /dev/tty2a for COM2).
To use these devices, you might need to add them to the system using mkdev parallel or mkdev serial. You can also use these mkdev commands to determine which devices are currently configured on your system. See the mkdev(ADM) manual page and Chapter 21, ``Adding serial and parallel ports'' in the SCO OpenServer Handbook.