1.\" $NetBSD: dz.4,v 1.7 1999/12/15 23:44:55 abs Exp $ 2.\" 3.\" Copyright (c) 1980, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" from: @(#)dz.4 8.1 (Berkeley) 6/5/93 35.\" 36.Dd June 5, 1993 37.Dt DZ 4 vax 38.Os 39.Sh NAME 40.Nm dz 41.Nd 42.Tn DZ-11 43serial multiplexer device interface 44.Sh SYNOPSIS 45.Cd "dz0 at uba0 csr 0160100 vector dzrint dzxint" 46.Sh DESCRIPTION 47A 48.Tn DZ-11 49provides 8 communication lines with partial modem control, 50adequate for 51.Ux 52dialup use. 53.Pp 54An optional argument 55.Ar flags 56may be supplied with the device specification 57in the config file indicating 58that the line corresponding to 59bit number 60.Ar i 61is not properly 62connected, and should be treated as hard-wired with carrier 63always present. Thus specifying 64.Ql flags 0x04 65for 66.Li dz0 67would cause line 68.Pa tty02 69to be treated in this way. 70.Pp 71Normal I/O 72control parameters for individual lines are managed by 73.Xr ioctl 2 74calls. 75Line speeds may be initiated via 76the 77.Xr ttys 5 78file, 79.Xr stty 1 80or 81.Xr ifconfig 8 82to name a few, 83see 84.Xr tty 4 . 85.Pp 86The 87.Nm dz 88driver monitors the rate of input on each board, 89and switches between the use of character-at-a-time interrupts 90and input silos. 91While the silo is enabled during periods of high-speed input, 92the driver polls for input 30 times per second. 93.Sh FILES 94.Bl -tag -width /dev/tty[0-9][0-9]xx -compact 95.It Pa /dev/tty[0-9][0-9] 96.It Pa /dev/ttyd[0-9a-f] 97dialups 98.El 99.Sh DIAGNOSTICS 100.Bl -diag 101.It dz%d: silo overflow . 102The 64 character input silo overflowed 103before it could be serviced. This can happen if a hard error occurs 104when the 105.Tn CPU 106is running with elevated priority, as the system will 107then print a message on the console with interrupts disabled. 108It is not serious. 109.El 110.Sh SEE ALSO 111.Xr stty 1 , 112.Xr tty 4 , 113.Xr ttys 5 , 114.Xr getty 8 115.Sh HISTORY 116A 117.Nm 118driver appeared in 119.At 32v . 120