1.\" Copyright (c) 1980, 1991 Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" from: @(#)dz.4 6.3 (Berkeley) 3/27/91 33.\" $Id: dz.4,v 1.2 1993/08/01 07:36:25 mycroft Exp $ 34.\" 35.Dd March 27, 1991 36.Dt DZ 4 vax 37.Os BSD 4 38.Sh NAME 39.Nm dz 40.Nd 41.Tn DZ-11 42multiplexer device interface 43.Sh SYNOPSIS 44.Cd "device dz0 at uba0 csr 0160100 vector dzrint dzxint" 45.Sh DESCRIPTION 46A 47.Tn DZ-11 48provides 8 communication lines with partial modem control, 49adequate for 50.Tn UNIX 51dialup use. 52.Pp 53An optional argument 54.Ar flags 55may be supplied with the device specification 56in the config file indicating 57that the line corresponding to 58bit number 59.Ar i 60is not properly 61connected, and should be treated as hard-wired with carrier 62always present. Thus specifying 63.Ql flags 0x04 64for 65.Li dz0 66would cause line 67.Pa tty02 68to be treated in this way. 69.Pp 70Normal I/O 71control parameters for individual lines are managed by 72.Xr ioctl 2 73calls. 74Line speeds may be initiated via 75the 76.Xr ttys 5 77file, 78.Xr stty 1 79or 80.Xr ifconfig 8 81to name a few, 82see 83.Xr tty 4 . 84.Pp 85The 86.Nm dz 87driver monitors the rate of input on each board, 88and switches between the use of character-at-a-time interrupts 89and input silos. 90While the silo is enabled during periods of high-speed input, 91the driver polls for input 30 times per second. 92.Sh FILES 93.Bl -tag -width /dev/tty[0-9][0-9]xx -compact 94.It Pa /dev/tty[0-9][0-9] 95.It Pa /dev/ttyd[0-9a-f] 96dialups 97.El 98.Sh DIAGNOSTICS 99.Bl -diag 100.It dz%d: silo overflow . 101The 64 character input silo overflowed 102before it could be serviced. This can happen if a hard error occurs 103when the 104.Tn CPU 105is running with elevated priority, as the system will 106then print a message on the console with interrupts disabled. 107It is not serious. 108.El 109.Sh SEE ALSO 110.Xr stty 1 , 111.Xr tty 4 , 112.Xr ttys 5 , 113.Xr getty 8 114.Sh HISTORY 115A 116.Nm 117driver appeared in 118.At 32v . 119