ttyS (4)

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]

/dev/ttyS[0-3]

chown(1), mknod(1), tty(4), agetty(8), mingetty(8), setserial(8)

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