The second session was restricted only by what the application supported. In 
the case of TSO, models 2 through 5, 3290 and custom geometries were all 
supported; it's just a case of using the right logmode. In, e.g., TPX, you 
could use configure any screen geometry that TSO supported. 

You get the geometry from the Bind image, Read Partition - Query, or a 
combination. That's how you were able to use, e.g., a 3180, with a primary of 
43 and a secondary of 132.

Obviously I lucked out in the session managers I was exposed to.


--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3

________________________________________
From: IBM Mainframe Discussion List <IBM-MAIN@listserv.ua.edu> on behalf of 
David Boyes <dbo...@sinenomine.net>
Sent: Monday, March 12, 2018 3:59 PM
To: IBM-MAIN@listserv.ua.edu
Subject: Re: Session Manager

On 3/12/18, 2:19 PM, "IBM Mainframe Discussion List on behalf of Seymour J 
Metz" <IBM-MAIN@LISTSERV.UA.EDU on behalf of sme...@gmu.edu> wrote:
> Not all session managers restrict you to 24x80; in fact, I have never had the 
> misfortune to use one that did. Are you sure that it was a product limitation
> and not a restriction decreed by your management?

In some ways it was a feature of the way VTAM worked, or at least a dramatic 
change in assumptions that came with programmable devices over classic dumb 
terminals; as I understand it, since you had two LU sessions in play 
(terminal-> session manager, session manager-> application), the second session 
was restricted to the lowest common denominator (24x80) if you wanted to 
support arbitrary incoming screen sizes because there was no way to pass actual 
terminal geometry to the second session without getting the information some 
other way. The telnet server skipped that limitation entirely and was smart 
enough to query the terminal and be able to pass the actual terminal geometry 
to the application.

Most of the session managers never really figured that one out, with a few 
notable exceptions.


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