Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!utcs!mnetor!seismo!caip!nike!ucbcad!ucbvax!rice.edu!milazzo
From: milazzo@rice.edu.UUCP
Newsgroups: mod.protocols.tcp-ip
Subject: Re:  Installing tn3270
Message-ID: <1986.07.13.09.58.14.milazzo.18630@titan.rice.edu>
Date: Sun, 13-Jul-86 10:58:13 EDT
Article-I.D.: titan.1986.07.13.09.58.14.milazzo.18630
Posted: Sun Jul 13 10:58:13 1986
Date-Received: Sun, 13-Jul-86 20:27:22 EDT
References: <8607111601.AA01386@bu-cs.bu.edu>
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 35
Approved: tcp-ip@sri-nic.arpa


        "I know that WiscNet supports RFC930 (Terminal Type Option)
        which a version of tn3270 from Rice used successfully"

Barry:

The 3270 support I wrote for telnet is NOT "a version of tn3270".  I
wrote the original version of the code long before hearing of tn3270,
and possibly before tn3270 was written.  I have never seen any version
of tn3270.

My code examines the user's terminal type and chooses the largest
suitable screen size from the following list:  3278-5, 3278-4, 3278-3,
3278-2, 3278-1, 3277-1.  If the user's terminal is not a CRT or is too
small for any of these terminal types, telnet simply remains in NVT
mode.  If the user's terminal is an oddly-shaped window, such as on a
SUN, telnet uses the appropriate upper left portion of the window.  On
startup it assumes the default size for the chosen 3270 model, and
switches to the alternate size upon receipt of an EWA.

My code currently does not support SNA codes, negotiation back to NVT
mode, or light pens.  It incompletely implements the PT order, and has
problems with SYS REQ, though the last may be WISCNET's fault, not mine.
SNA codes and negotiation back to NVT mode are trivial fixes.  The
remainder present varying degrees of difficulty.  PEN SELECT would be
easy to add, but real light pen support (say with the mouse on a SUN)
is fairly difficult.

				Paul G. Milazzo
				Dept. of Computer Science
				Rice University, Houston, TX

Domain:	milazzo@rice.EDU, milazzo@rice.ARPA
BITNET:	milazzo@ricenet
UUCP:	{cbosgd,convex,hp-pcd,sun,waltz}!rice!milazzo