93 lines
3.2 KiB
Groff
93 lines
3.2 KiB
Groff
.\" $NetBSD: zstty.4,v 1.4 2001/09/11 23:18:56 wiz Exp $
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.\"
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.\" Copyright (c) 1997 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Gordon W. Ross.
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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 the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd October 23, 1997
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.Dt ZSTTY 4
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.Os
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.Sh NAME
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.Nm zstty
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.Nd
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serial communications interface
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.Sh SYNOPSIS
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.Cd "zstty* at zs0" Pq sparc
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.Cd "zstty* at zsc1" Pq others
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.Sh DESCRIPTION
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The
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.Nm
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driver provides TTY support for Zilog 8530 Dual UARTS.
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.Pp
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Input and output for each line may set to any baud rate in the
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range 50 to 38400 (and higher on some machines).
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.Sh FILES
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.Bl -tag -width Pa
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.It Pa /dev/ttya
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.It Pa /dev/ttyb
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.El
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.Sh DIAGNOSTICS
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.Bl -tag -width indent -compact
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.It zs0*: fifo overflow
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.br
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The on-chip
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.Dq fifo
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has overflowed and incoming data has been lost.
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This generally means the machine is not responding to
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interrupts from the ZS chip fast enough, which can be
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remedied only by using a lower baud rate.
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.It zs0*: ring overflow
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.br
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The software input
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.Dq ring
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has overflowed. This usually means input flow-control
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is not configured correctly (i.e. incorrect cable wiring).
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.El
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.Sh SEE ALSO
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.Xr scc 4 ,
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.Xr tty 4
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.Sh HISTORY
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The
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.Nm
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driver was derived from the
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.Nm sparc
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.Nm zs
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driver supplied with
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.Bx 4.4 .
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.Ud
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.Sh BUGS
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The old Zilog 8530 chip has a very small fifo (3 bytes?) and
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therefore has very strict latency requirements for the
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interrupt service routine. This limits the usable baud rates
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on many machines.
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