dmf man page on Ultrix

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dmf(4)									dmf(4)

       dmf - DMF32 communications interface

       device dmf0 at uba? csr 0160340 flags 0x????
	    vector dmfsrint dmfsxint dmfdaint dmfdbint dmfrint dmfxint dmflint

       The  device  provides  eight  lines of asynchronous serial line support
       with full modem control on two lines only.    The  device  driver  also
       supports	 a  connection to a line printer through the line printer port
       of the DMF32.

       Each line attached to a DMF32 serial line port behaves as described  in
       Input  and  output for each line can be set independently 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 0x00f6'' in the specification
       of would cause lines 0 and 1 on the DMF32 to be treated as modem lines,
       while lines 2 through 7 are  direct  connect  no-modem  lines.	It  is
       important  to  specify lines 2 through 7 as direct connect, because the
       device does not support modem control on these lines.

       The driver normally uses input silos and polls for input at each	 clock
       tick  (10 milliseconds).	 The DMF32 will discard incoming characters on
       the lines with full modem control, if carrier is not present.

       The DMF32 provides other services, but these are not supported  by  the

       dmf%d: NXM line %d
       No response from UNIBUS on a transfer within a timeout period.  This is
       often followed by a UNIBUS adapter error.  This occurs most  frequently
       when  the UNIBUS is heavily loaded and when devices that monopolize the
       bus, such as RK07s, are present.	 It is not serious.

       dmf%d: silo overflow
       The 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.

       One  of	the  unsupported  ports	 of the DMF32 interrupted because of a
       problem.	 Check your interrupt vectors  for  a  conflict	 with  another

       (modem lines only)

See Also
       dmfsp(4), tty(4), MAKEDEV(8)

				      VAX				dmf(4)

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