Copyright (c) 1983, 1991, 1993
The Regents of the University of California. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
from: @(#)dmz.4 8.1 (Berkeley) 6/5/93
.Dd June 5, 1993 .Dt DMZ 4 vax .Os .Sh NAME .Nm dmz .Nd .Tn DMZ-32 serial terminal multiplexor .Sh SYNOPSIS .Cd "dmz0 at uba? csr 0160540" "vector dmzrinta dmzxinta dmzrintb dmzxintb dmzrintc dmzxintc" .Sh DESCRIPTION NOTE: This driver has not been ported from x 4.4 yet.
p The .Nm dmz device provides 24 lines of asynchronous serial line support. Modem control on all ports is available as an option for the H3014 distribution panel.
p An optional argument .Ar flags may be supplied with the device specification for .Nm dmz in the config file indicating that the line corresponding to bit number .Ar i is not properly connected, and should be treated as hard-wired with carrier always present. Thus specifying .Ql flags 0x000004 for .Li dmz0 would cause line
a ttya2 to be treated in this way.
p Normal .Tn I/O control parameters for individual lines are managed by .Xr ioctl 2 calls. Line speeds (there are 16 choices for the .Tn DMZ ) may be initiated via .Xr getty 8 and .Xr stty 1 or may be communicated by other programs which use .Xr ioctl 2 such as .Xr ifconfig 8 , see .Xr tty 4 .
p The .Nm dmz driver normally enables the input silos with a short timeout (30 milliseconds); this allows multiple characters to be received per interrupt during periods of high-speed input. .Sh FILES l -tag -width /dev/tty[abcefg][0-9a-n] -compact t Pa /dev/tty[abcefg][0-9a-n] .El .Sh DIAGNOSTICS l -diag t dmz%d: NXM line %d. No response from the .Tn UNIBUS on a .Tn DMA transfer within a timeout period. This is often followed by a .Tn UNIBUS adapter error. This occurs most frequently when the .Tn UNIBUS is heavily loaded and when devices which hog the bus (such as .Tn RK07 Ns s ) are present. It is not serious. t dmz%d: silo overflow. The character input silo overflowed before it could be serviced. This can happen if a hard error occurs when the .Tn CPU is running with elevated priority, as the system will then print a message on the console with interrupts disabled. It is not serious. .El .Sh SEE ALSO .Xr tty 4 .Sh HISTORY The .Nm driver appeared in x 4.3 . .Sh BUGS It should be possible to set the silo timeout with a configuration file option, as the value is a trade-off between efficiency and response time for flow control and character echo.
Indexes created Sun Sep 21 16:09:51 GMT 2025