• Add an <example> and use a calloutlist for the /etc/ttys section instead of creating a new subsection for each field. The output is much more succinct and legible.
• Add a note about FreeBSD 5.0 and devfs that obviates the 'Making Device Special Files' section.
• Remove reference to a book that we don't have any bibliographical information for and that is a bit tangential to the subject at hand (RS-232 Bible).
• Add missing words to make complete sentences.
• Simplify discussion of null-modem and "straight" serial cables.
• Consistently use a replaceable 'N' for the last character of terminal devices instead of interspersing ? and X.
• Remove duplicate 'See the sio(4) manual page for more information.' lines. One of these is quite sufficient per section.
• Remove more duplicate information that is unnecessary since this chapter has been reorganized.
• Enclose a hint in the <tip> tag.

This chapter still needs work.