# phpman > info > ttys

[TTYS(4)](https://www.chedong.com/phpMan.php/man/TTYS/4/markdown)                    Linux Programmer's Manual                   [TTYS(4)](https://www.chedong.com/phpMan.php/man/TTYS/4/markdown)

NAME
       ttyS - serial terminal lines

DESCRIPTION
       ttyS[0-3] are character devices for the serial terminal lines.

       They are typically created by:

           mknod -m 660 /dev/ttyS0 c 4 64 # base address 0x3f8
           mknod -m 660 /dev/ttyS1 c 4 65 # base address 0x2f8
           mknod -m 660 /dev/ttyS2 c 4 66 # base address 0x3e8
           mknod -m 660 /dev/ttyS3 c 4 67 # base address 0x2e8
           chown root:tty /dev/ttyS[0-3]

FILES
       /dev/ttyS[0-3]

SEE ALSO
       [chown(1)](https://www.chedong.com/phpMan.php/man/chown/1/markdown), [mknod(1)](https://www.chedong.com/phpMan.php/man/mknod/1/markdown), [tty(4)](https://www.chedong.com/phpMan.php/man/tty/4/markdown), [agetty(8)](https://www.chedong.com/phpMan.php/man/agetty/8/markdown), [mingetty(8)](https://www.chedong.com/phpMan.php/man/mingetty/8/markdown), [setserial(8)](https://www.chedong.com/phpMan.php/man/setserial/8/markdown)

COLOPHON
       This  page  is  part of release 5.10 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest     version     of     this    page,    can    be    found    at
       <https://www.kernel.org/doc/man-pages/>.

Linux                             1992-12-19                           [TTYS(4)](https://www.chedong.com/phpMan.php/man/TTYS/4/markdown)