Experiment showed me that both PCOMM and Vista TN3270 seem to send the same thing for "Attention", as both emulators work using "Attention" as "reshow" on my employer's network. Unfortunately there is no chance I could arrange to get a buffer trace from my employer's mainframe communications team when we have no problem.
I'm not sure what intermediary system(s) my friend uses there. I can ask, but my friend was quite happy to learn about using PA1 / PA2 for "reshow", so it may be a moot point. Thanks to all for your replies to satisfy my curiosity. I love learning like this, in a community that cares enough to educate and inform. Peter -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Seymour J Metz Sent: Tuesday, February 19, 2019 6:17 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Where does ISPF determine how to repsond to "Attention" function? ISPF uses VTIOC facilities, e.g., TGET, TPG, TPUT, to communicate with the terminal. By default VTIOC will interpret ATTN or PA1 as attention and PA2 as reshow. However, 1. It's anybody's guess whether PCOMM send ATTN or PA1 for "Attention". 2. ISPF runs in full screen mode, so things are a little different. 3. The above assumes that VTIOC is in session with the terminal, not with an intermediate program. >From what you wrote I would assume that at your friend's shop the terminal is >coming in through, e.g., NVAS, TPX. -- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of Farley, Peter x23353 <peter.far...@broadridge.com> Sent: Monday, February 18, 2019 5:20 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Where does ISPF determine how to repsond to "Attention" function? [Dual-posted to ISPF-L and IBM-MAIN] On my employer's z/OS 2.2 system and as far back as they have employed me (OS/390 R10 IIRC), pressing "Attention" (Esc on my PCOMM keyboard map) while in an ISPF screen "refreshes" the screen to the last stable state, so if you accidentally erased a whole line of program code or JCL you can recover what was there before the erase as long as you didn't press Enter or any PF/PA key before pressing "Attention". On a friend's z/OS system (not sure of the release), pressing "Attention" at any ISPF screen causes the terminal to be taken out of service (VTAM INACT). My question is where and how does ISPF determine how to respond to "Attention" to refresh the screen instead of making the terminal INACT? Or is that a VTAM function/setting of some kind? If it is VTAM, where is it specified? Just curious here, no actual problem to be solved ("Doctor! Doctor! It hurts when I do that!"; "Well, don't do that!"). Peter -- This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
