dzv(4)									dzv(4)

Name
       dzv - DZV11 communications interface

Syntax
       device dz0 at uba0 csr 0160100 flags 0x????
	    vector dzrint dzxint

Description
       A  DZV11	 provides four communication lines with partial modem control,
       adequate for dialup use.	 Each line attached to	the  DZV11  communica‐
       tions interface behaves as described in and can be set to run at any of
       16 speeds.  See for the encoding.

       Bit i of can be specified for a to say that a line is not properly con‐
       nected,	and that the line should be treated as hardwired, with carrier
       always present.	Thus, specifying ``flags 0x04'' in  the	 specification
       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 Also
       tty(4), MAKEDEV(8)

				      VAX				dzv(4)

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