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INTRO(4)										 INTRO(4)

       intro - introduction to special files and hardware support

       This section describes the special files, related driver functions, and networking support
       available in the system.  In this part of the manual, the SYNOPSIS section of each config-
       urable  device  gives  a sample specification for use in constructing a system description
       for the /sys/conf/configscript, the autoconfig(8), program  and	descibes  the  major  and
       minor device numbers and their encoding.  The DIAGNOSTICS section lists messages which may
       appear on the console and/or in the system error log /usr/adm/messages due  to  errors  in
       device operation.

       This section contains both devices which may be configured into the system, ``4'' entries,
       and network related information, ``4N'', ``4P'', and ``4F'' entries; The  networking  sup-
       port is introduced in intro(4N).

       This  section  describes  the  hardware supported on the DEC PDP-11.  Software support for
       these devices comes in two forms.  A hardware device may be supported with a character  or
       block  device driver, or it may be used within the networking subsystem and have a network
       interface driver.  Block and character devices are accessed through files in the file sys-
       tem of a special type; c.f.  mknod(8).  Network interfaces are indirectly accessed through
       the interprocess communication facilities provided by the system; see socket(2).

       A hardware device is identified to the system at configuration time  and  the  appropriate
       device  or  network interface driver is then compiled into the system.  When the resultant
       system is booted, the autoconfiguration facilities in the system probe for the  device  on
       either the UNIBUS (or Q-bus) or MASSBUS and, if found, enable the software support for it.
       If a device does not respond at autoconfiguration time it is not accessible  at	any  time
       afterwards.   To  enable  a device which did not autoconfigure, the system will have to be

       The autoconfiguration system is described in  autoconfig(8).   A  list  of  the	supported
       devices is given below.

       intro(4), networking(4), config(8).

       The  devices listed below are supported in this incarnation of the system.  Pseudo-devices
       are not listed.	Listed also are devices which are in various stages of porting to 2.11BSD
       from 4.3BSD.

       Devices	are  indicated	by their functional interface.	If second vendor products provide
       functionally identical interfaces they  should  be  usable  with  the  supplied	software.
       (Beware,  however,  that we promise the software works ONLY with the hardware indicated on
       the appropriate manual page.)  Occasionally, new devices of a similar type  may	be  added
       simply by creating appropriate table entries in the driver.

       The following are known to work:
       acc	 ACC LH/DH IMP communications interface
       de	 DEC DEUNA 10Mb/s Ethernet controller
       dh	 DH-11 emulators, terminal multiplexor
       dhu	 DHU-11 terminal multiplexor
       dz	 DZ-11 terminal multiplexor
       ec	 3Com 10Mb/s Ethernet controller
       hk	 RK6-11/RK06 and RK07 moving head disk
       ht	 TM03 MASSBUS tape drive interface (with TE-16, TU-45, TU-77)
       il	 Interlan 1010, 1010A, 2010A 10Mb/s Ethernet controller
       lp	 LP-11 parallel line printer interface
       qe	 DEC DEQNA Q-bus 10 Mb/s Ethernet interface
       ra	 DEC UDA-50, RQDX, KLESI disk controllers
       rk	 DEC RK05 disk controller
       rl	 DEC RL-11 disk controller
       rx	 DEC RX02 floppy interface
       si	 SI 9500 disk controller
       tm	 TM-11/TE-10 tape drive interface
       tmscp	 TMSCP-compatible tape controllers (e.g., TU81, TK50)
       ts	 TS-11 tape drive interface
       vv	 Proteon proNET 10Mb/s and 80Mb/s ring network interface
       xp	 General purpose SMD disk controller

       The following should work:
       dr	 DR-11W general purpose DMA UNIBUS interface

       The following worked in the past but will probably require work:
       css	 DEC IMP-11A communications interface
       dmc	 DEC DMC-11/DMR-11 point-to-point communications device
       en	 Xerox 3Mb/s Ethernet controller (obsolete)
       sri	 DR-11C IMP interface

       It should be possible to port these from 4.3BSD:
       ex	 Excelan 10Mb/s Ethernet controller
       ix	 Interlan NP-100 10Mb/s Ethernet controller
       np	 Interlan NP-100 10Mb/s Ethernet controller (intelligent mode)
       pcl	 DEC PCL-11 communications interface

       No idea whether any of the following could be ported:
       ad	 Data translation A/D interface
       ct	 C/A/T or APS phototypesetter
       ddn	 ACC ACP625 DDN Standard Mode X.25 IMP interface
       dmf	 DEC DMF-32 terminal multiplexor and parallel printer interface
       dmz	 DEC DMZ-32 terminal multiplexor
       dn	 DEC DN-11 autodialer interface
       hdh	 ACC IF-11/HDH IMP interface
       hp	 MASSBUS disk interface (with RP06, RM03, RM05, etc.)
       hy	 DR-11B or GI-13 interface to an NSC Hyperchannel
       kg	 KL-11/DL-11W line clock
       mt	 TM78 MASSBUS tape drive interface
       tu	 VAX-11/730 TU58 console cassette interface
       un	 DR-11W interface to Ungermann-Bass
       up	 Emulex SC-21V, SC-31 UNIBUS disk controller
       ut	 UNIBUS TU-45 tape drive interface
       uu	 TU58 dual cassette drive interface (DL11)
       va	 Benson-Varian printer/plotter interface
       vp	 Versatec printer/plotter interface

4th Berkeley Distribution		 January 27, 1996				 INTRO(4)
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