This is the output of ls -l /dev/ttyS*:
crw-rw---- 1 root dialout 4, 64 2009-07-02 10:50 /dev/ttyS0
crw-rw---- 1 root dialout 4, 65 2009-07-02 10:50 /dev/ttyS1
crw-rw---- 1 root dialout 4, 66 2009-07-02 10:50 /dev/ttyS2
crw-rw---- 1 root dialout 4, 67 2009-07-02 10:50 /dev/ttyS3
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