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BSD 2.11 - man page for tn3270 (bsd section 1)

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TN3270(1)										TN3270(1)

       tn3270 - full-screen remote login to IBM VM/CMS

       tn3270 sysname

       Tn3270  permits	a  full-screen,  full-duplex connection from a VAX UNIX machine to an IBM
       machine running VM/CMS giving the appearance of being logged in	directly  to  the  remote
       machine	on  an	IBM  3270 terminal.  Of course you must have an account on the machine to
       which you wish to connect in order to log in.  Tn3270 looks to the user in  many  respects
       like  the  Yale ASCII Terminal Communication System II.	Tn3270 is actually a modification
       of the Arpanet TELNET user interface (see telnet(1)) that  interprets  and  generates  raw
       3270 control streams.

       Emulation  of the 3270 terminal is done in the Unix process.  This emulation involves map-
       ping 3270-style commands from the host into appropriate sequences to  control  the  user's
       terminal screen.  Tn3270 uses curses(3x) and the /etc/termcap file to do this.  The emula-
       tion also involves simulating the special 3270 keyboard keys (program function keys, etc.)
       by  mapping  sequences of keystrokes from the ASCII keyboard into appropriate 3270 control
       strings.  This mapping is terminal dependent and  is  specified	in  a  description  file,
       /usr/share/misc/map3270,  (see  map3270(5))  or	in  an	environment variable MAP3270 (see
       mset(1)).  Any special function keys on the ASCII keyboard are used whenever possible.  If
       an  entry for the user's terminal is not found, tn3270 looks for an entry for the terminal
       type unknown.  If this  is  not	found,	tn3270	uses  a  default  keyboard  mapping  (see

       The  first  character  of each special keyboard mapping sequence is either an ASCII escape
       (ESC), a control character, or an ASCII delete (DEL).  If the user types  an  unrecognized
       function  key  sequence,  tn3270 sends an ASCII bell (BEL), or a visual bell if defined in
       the user's termcap entry, to the user's terminal and nothing is sent to the IBM host.

       If tn3270 is invoked without specifying a remote host system name, it enters local command
       mode,  indicated by the prompt ``tn3270>''.  In this mode, tn3270 accepts and executes the
       following commands:

	    open      connect to a remote host
	    close     close the current connection
	    quit      exit tn3270
	    z	      suspend tn3270
	    status    print connection status
	    ?	      print help information

       Other common telnet commands are not available in tn3270.  Tn3270 command mode may also be
       entered,  after connecting to a host, by typing a special escape character (typically con-

       While in command mode, any host login session is still alive  but  temporarily  suspended.
       The  host login session may be resumed by entering an empty line (press the RETURN key) in
       response to the command prompt.	A session may be terminated by logging	off  the  foreign
       host, or by typing ``quit'' or ``close'' while in local command mode.


       Greg Minshall

       mset(1), telnet(1), termcap(3x), termcap(5), map3270(5), Yale ASCII Terminal Communication
       System II Program Description/Operator's Manual (IBM SB30-1911)

       Performance is slow and uses system resources prodigiously.

       Not all 3270 functions are supported, nor all Yale enhancements.

4.3 Berkeley Distribution		November 27, 1996				TN3270(1)

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