1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. 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.\" @(#)dz.4 8.1 (Berkeley) 6/5/93 33.\" 34.Dd June 5, 1993 35.Dt DZ 4 vax 36.Os BSD 4 37.Sh NAME 38.Nm dz 39.Nd 40.Tn DZ-11 41multiplexer device interface 42.Sh SYNOPSIS 43.Cd "device dz0 at uba0 csr 0160100 vector dzrint dzxint" 44.Sh DESCRIPTION 45A 46.Tn DZ-11 47provides 8 communication lines with partial modem control, 48adequate for 49.Tn UNIX 50dialup use. 51.Pp 52An optional argument 53.Ar flags 54may be supplied with the device specification 55in the config file indicating 56that the line corresponding to 57bit number 58.Ar i 59is not properly 60connected, and should be treated as hard-wired with carrier 61always present. Thus specifying 62.Ql flags 0x04 63for 64.Li dz0 65would cause line 66.Pa tty02 67to be treated in this way. 68.Pp 69Normal I/O 70control parameters for individual lines are managed by 71.Xr ioctl 2 72calls. 73Line speeds may be initiated via 74the 75.Xr ttys 5 76file, 77.Xr stty 1 78or 79.Xr ifconfig 8 80to name a few, 81see 82.Xr tty 4 . 83.Pp 84The 85.Nm dz 86driver monitors the rate of input on each board, 87and switches between the use of character-at-a-time interrupts 88and input silos. 89While the silo is enabled during periods of high-speed input, 90the driver polls for input 30 times per second. 91.Sh FILES 92.Bl -tag -width /dev/tty[0-9][0-9]xx -compact 93.It Pa /dev/tty[0-9][0-9] 94.It Pa /dev/ttyd[0-9a-f] 95dialups 96.El 97.Sh DIAGNOSTICS 98.Bl -diag 99.It dz%d: silo overflow . 100The 64 character input silo overflowed 101before it could be serviced. This can happen if a hard error occurs 102when the 103.Tn CPU 104is running with elevated priority, as the system will 105then print a message on the console with interrupts disabled. 106It is not serious. 107.El 108.Sh SEE ALSO 109.Xr stty 1 , 110.Xr tty 4 , 111.Xr ttys 5 , 112.Xr getty 8 113.Sh HISTORY 114A 115.Nm 116driver appeared in 117.At 32v . 118