98 lines
3.5 KiB
Groff
98 lines
3.5 KiB
Groff
.\"
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.\" Copyright (c) 1996 Jonathan Stone.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Jonathan Stone.
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.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $NetBSD: dc.4,v 1.2 1997/10/13 11:23:45 lukem Exp $
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.\"
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.Dd August 6, 1996
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.Dt DC 4 pmax
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.Os NetBSD 1.2a
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.Sh NAME
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.Nm dc
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.Nd
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dc659,dc7085 DZ11-on-a-chip serial communications interface
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.Sh SYNOPSIS
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.Cd "dc0 at ioasic?"
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.Cd "dc0 at mainbus"
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.Cd "dc1 at mainbus"
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.Cd "dc2 at mainbus"
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.Cd "dc0 at vsbus"
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.Sh DESCRIPTION
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THe
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.Nm
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driver provides support for Digital's dc7085 four-port serial
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communcations chip.
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The
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.Nm dc
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driver supports dc7085 hardware on attached to the following
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parent devices:
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.Pp
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.Bl -tag -width speaker -offset indent -compact
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.It mainbus
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baseboard device on Decstation 2100, 3100, and 5100,
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and optional expansion devices on the 5100.
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.It ioasic
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baseboard device on Decstation 5000/200.
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.It vsbus
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baseboard devices on the Vaxstation 2000 and 3100.
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.El
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.Pp
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The
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.Nm
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device is essentially a single-chip clone of the DZ-11.
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It has a small input silo shared across all input ports.
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Model control lines are present on two of the four ports.
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The device does not interrupt on modem transitions; instead,
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they are detected via polling.
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Only two lines on a baseboard dc7085 have modem control signals; the
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other two are wired for a keyboard and mouse.
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On some implementations, only partial modem control (sufficent for
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Unix dialup) is provided, while others provide full modem control.
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Speeds greater than 19200 are not supported. The 19200 speed is rumoured
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to actually be 19600, presumably for bug-compatibility with the DZ-11.
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.Pp
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.Sh HISTORY
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The
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.Nm
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driver
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first appeared in
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.Bx 4.4 /pmax. Support for Vax implementations is
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.Ud .
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.Sh BUGS
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The Decstation 5000 can set a bit in the system register
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to allow the
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.Nm
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to run at 38400, but this applies to all four lines and disables
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the 19200 speed. This feature is not currently supported.
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.Pp
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The driver should probably support the original DZ-11, DZ-32,
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and Qbus DZV-11 and DZQ-11 clones.
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