DZ
Section: Devices and Network Interfaces (4)
Updated: vax
Index
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BSD mandoc
BSD 4
NAME
dz
- DZ-11
multiplexer device interface
SYNOPSIS
device dz0 at uba0 csr 0160100 vector dzrint dzxint
DESCRIPTION
A
DZ-11
provides 8 communication lines with partial modem control,
adequate for
UNIX
dialup use.
An optional argument
flags
may be supplied with the device specification
in the config file indicating
that the line corresponding to
bit number
i
is not properly
connected, and should be treated as hard-wired with carrier
always present. Thus specifying
`flags'
0x04
for
dz0
would cause line
tty02
to be treated in this way.
Normal I/O
control parameters for individual lines are managed by
ioctl(2)
calls.
Line speeds may be initiated via
the
ttys(5)
file,
stty(1)
or
ifconfig(8)
to name a few,
see
tty(4).
The
dz
driver monitors the rate of input on each board,
and switches between the use of character-at-a-time interrupts
and input silos.
While the silo is enabled during periods of high-speed input,
the driver polls for input 30 times per second.
FILES
- /dev/tty[0-9][0-9]
-
- /dev/ttyd[0-9a-f]
-
dialups
DIAGNOSTICS
- dz%d: silo overflow
-
The 64 character input silo overflowed
before it could be serviced. This can happen if a hard error occurs
when the
CPU
is running with elevated priority, as the system will
then print a message on the console with interrupts disabled.
It is not serious.
SEE ALSO
stty(1),
tty(4),
ttys(5),
getty(8)
HISTORY
A
driver appeared in
AT&T System
32v .
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- FILES
-
- DIAGNOSTICS
-
- SEE ALSO
-
- HISTORY
-
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