Added SUPDUP client and server support. SUPDUP, like TELNET, allows

remote access to ITS (and other systems). However, SUPDUP is capable
of automatically setting the terminal type on the remote system and
is therefore more convenient for display terminals and full screen
support.

README.md

@@ -59,8 +59,9 @@ from scratch.
    - HOSTS3, the host table compiler.
    - H3MAKE, a job that requests DRAGON to build host table.
    - ATSIGN TCP, TCP support
-   - TELSER, Telnet server
+   - TELSER, Telnet/Supdup server
    - TELNET, Telnet client
+   - SUPDUP, Supdup client
 
 6. A brand new host table is built from the host table source and
    installed into SYSBIN; HOSTS3 > using H3MAKE.
@@ -74,8 +75,8 @@ not have the necessary support. As of this release, only the ITS monitor,
 host table tools, and binary host table are installed. 
 
 Currently, basic TCP network support is in the build, in addition to
-both a TELNET server client. Other network services will appear in a 
-subsequent release.
+both a TELNET/SUPDUP server, and both TELNET and SUPDUP clients.
+Other network services will appear in a subsequent release.
 
 The KLH10 dskdmp.ini file has an IP address (192.168.1.100) and gateway IP 
 address (192.168.0.45) configured for the ITS system. The IP address 

build/build.tcl

@@ -321,6 +321,18 @@ expect ":KILL"
 
 respond "*" ":link sys;ts telnet,sysbin;telnet bin\r"
 
+# supdup port (95) uses telser
+respond "*" ":link device;tcp syn137,sysbin;telser bin\r"
+
+# supdup client
+respond "*" ":midas sysbin;supdup_sysnet;supdup\r"
+expect ":KILL"
+
+respond "*" ":print sys1;..new. (udir)\r"
+type ":vk\r"
+
+respond "*" ":link sys1;ts supdup,sysbin;supdup bin\r"
+
 respond "*" ":link kshack;good ram,.;ram ram\r"
 respond "*" ":link kshack;ddt bin,.;@ ddt\r"
 respond "*" $emulator_escape

doc/info/telnet.22

@@ -0,0 +1,126 @@
+-*-Text-*-
+
+File: TELNET	Node: Top	Up: (DIR)
+
+     TELNET is a program to communicate with other hosts on the
+Internet or MIT's Chaosnet.  It is intended primarily for communicating with
+non-MIT hosts; a special TELNET program, SUPDUP, exists for communicating
+which hosts which support the ITS "SUPDUP" display protocol.  Most MIT hosts
+support SUPDUP, save for a few small Unix machines, some Lisp Machines,
+Multics, and hosts that run VMS.  SUPDUP is also supported by S1 and SU-AI.
+SUPDUP is the preferred method of getting from one place to another, since
+one does not (ordinarily) have to manually set the terminal type on the other
+host.
+
+* Menu:
+
+* Telnet: TELNET	General-purpose TELNET
+* Supdup: SUPDUP	SUPDUP (the SUPer DUPer network terminal protocol)
+
+File: TELNET	Node: TELNET	Next: SUPDUP	Up: Top
+
+     When TELNET is started, it first checks for JCL passed from
+DDT.  If there was JCL, it is taken as a host name to connect to.
+Otherwise, if the job name is not one of {TN, TELNET, xTN,
+xTELNET~, the job name is interpreted as JCL and the JCL action
+applies to it, else, the user is placed in TELNET command mode.
+In TELNET command mode the user may enter any of the commands
+listed below, subject to restrictions noted with the command.  If
+a command or any part of a command is invalid, TELNET will refuse
+to echo the offending character.  Confirms may be flushed by any
+character other than 'Y', 'y', ' ', or <cr>; an 'O' command may
+be flushed by a rubout.
+
+     An exception to the JCL convention listed above is that "?"
+typed as a JCL argument automatically does a Help command.
+
+     When a connection is open ("talk mode"), the intercept
+character (normally <CONTROL>^ on non-TV's, [BREAK] on TV's) will
+put TELNET in command mode for a single command.  Unless that
+command closes the connection or returns to DDT, following
+execution of the command the user is returned to talk mode.  If
+no connection is open, a command will simply return, causing
+another command to be prompted for.  In talk mode, command
+prompts are homed down to the bottom of the screen.
+
+     The "H" command and the [HELP] key will output an incredibly
+long help message telling everything you never wanted to know
+about how to use TELNET in every hairy way imaginable. 
+
+File: TELNET	Node: SUPDUP	Next: CMNDS	Up: Top
+
+     The SUPDUP program can be used to log in to most MIT
+systems and SAIL over the network.  The other system is informed
+of your terminal type so that you get all the facilities
+available locally.  In particular, if you are at a display
+terminal TECO ^R mode will work, etc.
+
+     The :AI, :MC, :ML, :OZ, :XX, or :SAIL commands may be used to get
+to the AI, MC, ML, OZ, XX, or SAIL systems, respectively, or the
+:SUPDUP command may be used.  The latter asks for a host name.
+
+     There is one character which is intercepted by SUPDUP so
+that you can give it commands.  The character is <CONTROL>^ on
+regular terminals, and [BREAK] on TVs.  All other characters are
+sent through to the net, including ^Z and ^_ !!  So to get out of
+the program, do a <CONTROL>^ or [BREAK] followed by L (for
+Logout).  This logs you out on the other end.  To get out
+temporarily (what ^Z would do to other programs), say "D" instead
+of "L".
+
+     There are more commands, documented in the next node.
+
+     If your connection is broken for any reason, INCLUDING the
+"Q" command, but not including the "L" or "Logout" command, the
+job on the other system will be detached.  You have an hour to
+come back and claim it (log in again and DDT will say --ATTACH
+YOUR DETACHED JOB-- and you reply space.)  If you don't pick up
+the job within that time it will be flushed.  
+
+File: TELNET	Node: CMNDS	Previous: SUPDUP	Up: SUPDUP
+
+SUPDUP Commands:
+
+     All characters including ^Z and ^_ work through the network, except for
+^^ (ctrl-circumflex or ctrl-shift-N) on regular terminals, and [BREAK] on TV
+terminals.  (N.B.  On some terminals, like VT100s, control-^ is actually
+typed in as control-`.)  This character is an escape to "command" mode; it
+types "Cmnd -> " and you may now type a one-letter command:
+
+	Q closes your connection and :KILL's.  :LOGOUT first!!
+
+	L is like Q but automatically logs out your jobs at the
+	  other end.
+
+	D gets back to DDT without closing the connection; p to
+	  resume talking to the other system.
+
+	^Z does local ^Z (same as D).
+
+	C allows you to change the command character if you use
+	  ^^ (or [BREAK]) too much to waste it on this.
+
+	G enters a mode where ^G and ^S are assumed to mean "stop
+	  typing."  If you type one of these characters, SUPDUP
+	  will send it through but it will locally inhibit
+	  typeout until you type another character.  This is to
+	  provide fast response on slow terminals.  Another G
+	  command turns the mode off again.
+
+	? gives brief help.
+
+	The command character sent as a command sends itself to
+	the remote site.  Anything else is ignored.
+
+     After you type your one command the cursor goes back to
+where it was and you are back in normal mode.
+
+     On TV terminals the various control and meta keys all work
+just as they do locally.  Note that the initial command character
+is BREAK rather than CTRL/^.
+
+     On non-TV terminals the control characters are translated
+into the upper-case ASCII controls of the 12-bit TV character
+set.  This includes the RETURN and ALTMODE keys; note that the
+TVs give different codes for RETURN and CTRL/M.  However, this is
+the proper thing for Teco ^R mode.