TN3270 only defines how to wrap the data stream. You still need the IBM documentation to construct or interpret the data stream.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 עַם יִשְׂרָאֵל חַי נֵ֣צַח יִשְׂרָאֵ֔ל לֹ֥א יְשַׁקֵּ֖ר ________________________________________ From: IBM Mainframe Discussion List <[email protected]> on behalf of Lennie Bradshaw <[email protected]> Sent: Friday, August 16, 2024 9:13 AM To: [email protected] Subject: Re: 3270 programming Seymour, That is interesting. I was unaware the protocol had been externalised from IBM. I guess this absolves them of the responsibility of providing documentation as well. Phil asked what was the original posters requirement. Well years ago (in the late 1970s) I wrote some program for TSO using 3270 protocols. This was in the days before ISPF and before the extended attribute support was available. I have been involved in such programs rarely since then, but have maintained some knowledge of the protocol. I have somewhere a "Green Book" which has all the tables and so on, but I have mislaid it. I had to make some changes to a VTAM USS table recently and was looking for the specifications for the control strings I could use. As I couldn't find my Green Book, I looked online and could not see where IBM had this documented. Hence my questions. The website that Sebastian found was really useful. Many thanks to all who contributed. I will try and butt out now. Lennie -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Seymour J Metz Sent: 16 August 2024 12:56 To: [email protected] Subject: Re: 3270 programming I would start with RFC 2355, TN3270 Enhancements <https://datatracker.ietf.org/doc/rfc2355/> -- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 עַם יִשְׂרָאֵל חַי נֵ֣צַח יִשְׂרָאֵ֔ל לֹ֥א יְשַׁקֵּ֖ר ________________________________________ From: IBM Mainframe Discussion List <[email protected]> on behalf of Mike Schwab <[email protected]> Sent: Thursday, August 15, 2024 11:12 PM To: [email protected] Subject: Re: 3270 programming https://www.ibm.com/docs/en/zos-basic-skills?topic=terminal-3270-data-stream Specifically listed but no link, On Thu, Aug 15, 2024 at 7:45 PM Tom Brennan <[email protected]> wrote: > > I don't think TN3270/TN3270E protocols are related to this manual. > They're basically just a layer used to pass the binary 3270 data > stream back and forth. > > But Lennie has a good point. I have a printed copy -05 from 1990 and > it's pretty beat up. I seem to remember it on an IBM doc site until > (guessing) 2005 or so, then it was suddenly gone. Maybe someone made > a mistake in removing it, because it's certainly required for anybody > who wants to code their own 3720 screens, or simply wants to know how > things work. > > On 8/15/2024 5:33 PM, Ken Bloom wrote: > > 3270 is supported via tn3270 and tn3270E. That’s the protocol supported > > by IBM OSA or Visara CCA3074 etc. You can probably find some old coax > > manuals for native 3270. > > > > Ken > > > > > > Kenneth A. Bloom > > CEO > > Avenir Technologies Inc > > /d/b/a Visara International > > 203-984-2235<tel:203-984-2235> > > [email protected]<mailto:[email protected]> > > http://www.visara.com/<http://www.visara.com/> > > > > > > On Aug 15, 2024, at 8:22 PM, Lennie Bradshaw <[email protected]> > > wrote: > > > > So if the protocol is still supported, and still used, and still a valid > > programming interface, why is there no *current* manual available from IBM > > documenting it? > > > > Lennie > > > > -----Original Message----- > > From: IBM Mainframe Discussion List <[email protected]> On > > Behalf Of Jay Maynard > > Sent: 15 August 2024 23:02 > > To: [email protected] > > Subject: Re: 3270 programming > > > > I think IBM still supports 3270 access, if not the 3270s themselves. > > > > But if the data stream hasn't changed since the -7 manual was published, > > there's no need for an update... > > > > On Thu, Aug 15, 2024 at 4:54 PM Paul Gilmartin < > > [email protected]> wrote: > > > > On Thu, 15 Aug 2024 15:16:15 -0500, Mike Schwab wrote: > > > > There have been no updates. > > > > Does IBM continue to support the device? If not, there's little > > business case to provide user's manuals. > > > > Regardless, some documentation is necessary as long as IBM products > > depend on 3270 data streams. > > > > -- > > gil > > > > -------------------------------------------------------------------- > > -- For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to [email protected] with the message: INFO > > IBM-MAIN > > > > > > > > -- > > Jay Maynard > > > > -------------------------------------------------------------------- > > -- For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to [email protected] with the message: INFO > > IBM-MAIN > > > > -------------------------------------------------------------------- > > -- For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to [email protected] with the message: INFO > > IBM-MAIN > > > > -------------------------------------------------------------------- > > -- For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to [email protected] with the message: INFO > > IBM-MAIN > > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send > email to [email protected] with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
