On 6/20/2011 4:05 PM, Paul Gilmartin wrote:
o Does any terminal emulator provide dynamic geometry change during a session?
Probably most of them. I know PCOMM supports this. Rebind is a standard part of the protocol.
ISPF wouldn't tolerate it; I know; disconnecting from an ISPF session and reconnecting with a different geometry results in an endless iterative "TERMINAL I/O ERROR". I can't even SAVE and END. But that's ISPF tunnel vision. OTOH: o If I disconnect from a TSO READY prompt and reconnect with a different screen geometry, TSO continues in line mode savvy to the change. Why doesn't TSO pass notification of this change to ISPF if it's running, and/or why doesn't ISPF accommodate?
A command processor is not expected to issue GTTERM and adapt to any changes in screen geometry prior to every terminal I/O. Rather, standard procedure is to issue GTTERM once per command. When the command ends, the user can rebind and run another command at the new dimensions.
o I must have tried the experiment with SDSF, under ISPF and/or from the READY prompt. I don't recall the result.
I would not expect SDSF to do anything other than follow standard procedures. Last time I checked it didn't even support 'large' screens except under ISPF, so I think it's very old code.
o What would (E)JES do in case of reconnect with changed terminal geometry? :-)
(E)JES supports any terminal geometry in any environment (ISPF, TSO READY, CICS, stand-alone VTAM, even the emulated screens [should a program care to inspect them for some reason] under the APIs, etc.) If you reconnect to the stand-alone VTAM environment with different dimensions, the environment will pick up the change dynamically. But, to avoid 'strange' looking screens you should return to the equivalent of TSO/E READY and restart your (E)JES session (which takes only two keystrokes in that environment).
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