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BSD 2.11 - man page for dz (bsd section 4)

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DZ(4)											    DZ(4)

NAME
       dz - DZ-11 communications multiplexer

SYNOPSIS
       /sys/conf/SYSTEM:
	    NDZ  dz_units  # DZ11; NDZ is in units of boards (8 each)

       /etc/dtab:
	    #Name Unit# Addr   Vector Br Handler(s)	 # Comments
	    dz	  ?	160100 310    5  dzrint  dzdma	 # dz11 terminal mux

       major device number:
	    raw: 2
       minor device encoding:
	    bits 0007 specify line on DZ unit
	    bits 0170 specify DZ unit
	    bit  0200 specifies non-blocking open (``CD always on'')

DESCRIPTION
       A DZ11 provides 8 communication lines with partial modem control, adequate for UNIX dialup
       use.  Each line attached to the DZ11 communications multiplexer behaves	as  described  in
       tty(4) and may be set to run at any of 16 speeds; see tty(4) for the encoding.

       Bit  0200  of  the  minor  device number for DZ lines may be set to say that a line is not
       properly connected, and that the line should be treated as hard-wired with carrier  always
       present.   Thus creating the special character device node "2, 130" via mknod /dev/tty02 c
       2 130 would cause line tty02 to be treated in this way.

       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
       /dev/MAKEDEV	   script to create special files
       /dev/MAKEDEV.local  script to localize special files

SEE ALSO
       tty(4), dtab(5), autoconfig(8)

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.

3rd Berkeley Distribution		 January 28, 1988				    DZ(4)
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