> AID codes are passed to the host when you press a key such as Enter, > Clear, PF keys,
So far, so good. > and of course Two out of three. > PA1/PA2/Attn. Shirley you know better. ATTN is carried in an expedited flow SIGNAL and has no AID. -- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of Tom Brennan <t...@tombrennansoftware.com> Sent: Tuesday, February 19, 2019 8:02 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Where does ISPF determine how to repsond to "Attention" function? This is pretty interesting to me, because in the past I've noticed that when I connect to TSO via a 3270 control unit (let's call that port 3270) such as on the Hercules TK4 setup, Vista TN3270 Attention doesn't work as expected - X-SYSTEM appears but nothing else happens. But Attention DOES work when I connect to a z/OS system via TCPIP/TN3270 (let's call that port 23). Now with PCOMM, Attention works fine via TCPIP port 23, and *also* works fine via a control unit port 3270 So what's up with that? I took some WireShark traces just now and here are the bytes that flew by: Key Vista PCOMM ------- ------- ----------- PA1 6CFFEF 6CFFEF same PA2 6EFFEF 6EFFEF same Attn FFF3 6CFFEF FFF3 different! So if you ask me, PCOMM (very old version on my PC by the way) is sending *both* a PA1 and Attention sequence to the TN3270 server. Since (externally) that seems to act exactly like PA1 when it arrives, all I can guess is the FFF3 is being ignored. That actually works better on a 3270 port because it causes the action I want and doesn't lock up the screen. Notes: For this test I used the PCOMM keypad pulldown which I assume has never been altered by me over the years I've had the program. 6C and 6E are AID (attention identifier) bytes. AID codes are passed to the host when you press a key such as Enter, Clear, PF keys, and of course PA1/PA2/Attn. The FFEF marks the end of a TN3270 data block, so we can ignore that. Any FFxx code is picked up by the TN3270 server (never sent to VTAM in that form), and in this case supposed to do whatever logic is needed to tell VTAM an attention was issued. PCOMM may have options to alter its Attention processing - I know there are a whole lot of INI options in that program. If I touched something there, I've long since forgotten. On 2/19/2019 3:50 PM, Farley, Peter x23353 wrote: > 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. 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