ttyS — serial terminal lines
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]
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Copyright (c) 1993 Michael Haardt (michaelmoria.de),
Fri Apr 2 11:32:09 MET DST 1993
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Modified Sat Jul 24 17:03:24 1993 by Rik Faith (faithcs.unc.edu)