dz(4)dz(4)Namedz - DZ11/DZ32 communications interface
device dz0 at uba0 csr 0160100 flags 0x????
vector dzrint dzxint
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
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.
(modem lines only)
See Alsotty(4), MAKEDEV(8)