From owner-freebsd-hackers  Fri Oct  5  8:14:46 2001
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Date: Fri, 5 Oct 2001 11:14:43 -0400
From: Joe Abley <jabley@automagic.org>
To: Benjamin Gross <bgross1@rcn.com>
Cc: freebsd-hackers@freebsd.org
Subject: Re: serial ports
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On Fri, Oct 05, 2001 at 10:25:47AM -0400, Benjamin Gross wrote:
> what device file represents port 1 on a pc ? 

Assuming you mean "the lowest-numbered port on a PC" (the one
commonly found at IRQ4 on the ISA bus):

  /dev/ttyd0   for callin ports
  /dev/ttyid0  corresponding callin initial-state device
  /dev/ttyld0  corresponding callin lock-state device
  /dev/cuaa0   for callout ports
  /dev/cuaaia0 corresponding callout initial-state device
  /dev/cuaala0 corresponding callout lock-state device

See sio(4).


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