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+.\" $NetBSD: ucom.4,v 1.29 2020/04/13 08:45:11 wiz Exp $
+.\"
+.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Lennart Augustsson.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd April 12, 2020
+.Dt UCOM 4
+.Os
+.Sh NAME
+.Nm ucom
+.Nd USB tty support
+.Sh SYNOPSIS
+.Cd "ucom* at u3g?"
+.Cd "ucom* at uark?"
+.Cd "ucom* at ubsa?"
+.Cd "ucom* at uchcom?"
+.Cd "ucom* at uftdi?"
+.Cd "ucom* at ugensa?"
+.Cd "ucom* at uhmodem?"
+.Cd "ucom* at uipaq?"
+.Cd "ucom* at ukyopon?"
+.Cd "ucom* at umcs? portno ?"
+.Cd "ucom* at umct?"
+.Cd "ucom* at umodem?"
+.Cd "ucom* at uplcom?"
+.Cd "ucom* at uslsa?"
+.Cd "ucom* at uvisor? portno ?"
+.Cd "ucom* at uvscom?"
+.Cd "ucom* at uxrcom?"
+.Sh DESCRIPTION
+The
+.Nm
+driver attaches to USB modems, serial ports, and other devices that need
+to look like a tty.
+The
+.Nm
+driver shows a behaviour like a
+.Xr tty 4 .
+This means that normal programs such as
+.Xr tip 1
+or
+.Xr pppd 8
+can be used to access the device.
+.Pp
+The
+.Va portno
+locator can be used to decide which port to use for device that have
+multiple external ports.
+.Pp
+Note that while
+.Nm
+supports the (undocumented) pulse-per-second API normally used on
+conventional serial ports, USB serial devices typically have a varying
+latency around 1 ms due to the USB frame structure.
+.Pp
+The ttyXX devices are traditional dial-in devices; the dtyXX devices
+are used for dial-out.
+(See
+.Xr tty 4 . )
+.Sh FILES
+.Bl -tag -width Pa
+.It Pa /dev/dtyU?
+.It Pa /dev/ttyU?
+.El
+.Sh SEE ALSO
+.Xr tty 4 ,
+.Xr u3g 4 ,
+.Xr uark 4 ,
+.Xr ubsa 4 ,
+.Xr uchcom 4 ,
+.Xr uftdi 4 ,
+.Xr ugensa 4 ,
+.Xr uhmodem 4 ,
+.Xr uipaq 4 ,
+.Xr ukyopon 4 ,
+.Xr umcs 4 ,
+.Xr umct 4 ,
+.Xr umodem 4 ,
+.Xr uplcom 4 ,
+.Xr usb 4 ,
+.Xr uslsa 4 ,
+.Xr uvisor 4 ,
+.Xr uvscom 4 ,
+.Xr uxrcom 4
+.Sh HISTORY
+The
+.Nm
+driver
+appeared in
+.Nx 1.5 .