68 lines
2.8 KiB
Groff
68 lines
2.8 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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.\" $Id: scc.4,v 1.1 1996/08/11 02:29:19 jonathan Exp $
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.\"
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.Dd August 6, 1996
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.Dt SCC 4 pmax
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.Os NetBSD 1.2
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.Sh NAME
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.Nm scc
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.Nd
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Zilog serial communications interface
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.Sh SYNOPSIS
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.Cd "scc0 at ioasic?"
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.Cd "scc1 at ioasic?"
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.Sh DESCRIPTION
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THe
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.Nm
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driver provies support for the Zilog 8530 Serial Communcations
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Controller (SCC) via the IOCTL asic on DECstation 5000 models
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in the /100, /20, and /240 series. Each scc device has two serial
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ports. The model 20 provides one scc device. Other models provide two,
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but one port of each device is dedicated to mouse and keyboard input,
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respectivey.
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.Pp
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Input and output for each line may set to one of following baud rates;
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50, 75, 110, 134.5, 150, 300, 600, 1200, 1800, 2400, 4800, 9600,
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19200, 38400, or 57600.
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Speeds up to 230400 are supported by the chip and the motherboard,
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but speeds higher than 57600 do not work reliably without an external
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clock signal.
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Bx 4.4 .
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.Sh BUGS
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The IOCTL asic provides internal DMA channels that can be programmed
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to transfer up to 4096 bytes of data into, or out, of an SCC without
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further software intervention. This feature of the ioctl asic is not
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yet supported.
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