On Fri, 2005-Aug-19 15:46:57 -0700, Jim Pazarena wrote:
>would someone please advise the purpose of the "iR" & "lR" devices?

You can use termios(2) on the 'i' device to define the default initial
state on device open and on the 'l' device to lock parameters so they
can't be changed.  Look for 'lock' or 'initial' in the sio(4) manpage.

Sorry, I can't help with the rest.

-- 
Peter Jeremy
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