dz(4)dz(4)Namedz - DZ11/DZ32 communications interface
Syntax
device dz0 at uba0 csr 0160100 flags 0x????
vector dzrint dzxint
Description
A DZ11/DZ32 interface provides eight communication lines with partial
modem control, adequate for dialup use. Each line attached to the
DZ11/DZ32 communications interface behaves as described in and can be
set to run at any of 16 speeds. See for the encoding.
Bit i of cwcanmay be specified for a to say that a line is not properly
connected, and that the line should be treated as hardwired, with car‐
rier always present. Thus, specifying ``flags 0x04'' in the specifica‐
tion of would cause line 2 to be treated in this way.
The driver normally uses its input silos and polls for input at each
clock tick (10 milliseconds), rather than taking an interrupt on each
input character.
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 then prints a message on the console,
with interrupts disabled.
Files
(modem lines only)
See Alsotty(4), MAKEDEV(8)
VAX dz(4)
