mm06@gte-labs.CSNET.UUCP (08/16/86)
I have heard rumors of a 3270 emulation package intended for use as a telnet option. Does such an animal exist? If so, who wrote it? Is it available? Is there published literature describing it? The rumors I heard associated it with the UCLA IP implementation for MVS, if that is any help. This may be rather garbled, to say the least; my apologies for the lack of specifics. ---------------------------------------------- Mike Murphy GTE Laboratories, Waltham, MA mm06%gte-labs.csnet@RELAY.CS.NET ..!ihnp4!harvard!bunny!mmm06
braden@VENERA.ISI.EDU (Bob Braden) (08/18/86)
______________________________________________________ I have heard rumors of a 3270 emulation package intended for use as a telnet option. Does such an animal exist? If so, who wrote it? Is it available? Is there published literature describing it? The rumors I heard associated it with the UCLA IP implementation for MVS, if that is any help. This may be rather garbled, to say the least; my apologies for the lack of specifics. ---------------------------------------------- Mike Murphy GTE Laboratories, Waltham, MA mm06%gte-labs.csnet@RELAY.CS.NET ..!ihnp4!harvard!bunny!mmm06 _________________________________________________________ Mike, There is an accepted mechanism for supporting full-screen IBM 3278 operation over a Telnet connection. The essential idea is that you ship the 3278 order stream transparently, after negotiating the Binary Transmission option in both directions. There is an initial Terminal Type negotiation to establish the model number, and both ends must agree that they handle End-of-Record marks (which are used to delimit keyboard and screen transactions). This mechanism is currently supported by the User and Server Telnets of both the Wisconsin VM code and the UCLA MVS code. Unforunately, there are minor differences which make the two versions almost but not quite compatible. No one has "bit the bullet" to reach a standard and document it. In addition, there are programs which run under Unix to act as the user side of the full-screen Telnet interaction, emulating a 3278 on the local ASCII CRT/workstation. The one I am familiar with is called tn3278, and was written by Greg Minshall at Berkeley. It is available by public FTP from Berkeley, although you should be aware it needs several bug fixes. I recently installed it on my Sun 3, and after I fixed the most important bugs, it provided excellent service to the UCLA 3090 running MVS (when you have to communicate through a loaded ARPANET/MILNET gateway, full- screen interaction works A LOT BETTER than character-by-character mode!!!). Bob Braden