Hi folks, I am trying to go back to basics a bit and figure out some things that I have always treated as magic. Right now it is how a 3270 terminal connected to a z/OS determines the size of the terminal. In this case through OSA-ICC (zBC12, OSA-Express5) and not TCPIP,
On systems where I have configured VTAM with TCPIP the terminal size seems to almost always "just work". Let's take a look at an example. I have configured X3270 with model "3279-4-E" and oversize set to "133x60". 1) What does the z/OS VTAM screen look like? Over OSA-ICC: 80x24 Over TCPIP: 80x24 So far so good. 2) What does the TSO screen look like? Over OSA-ICC: 80x24 Over TCPIP: 80x24 Ok, no change. 3) What does the ISPF screen look like? Over OSA-ICC: 80x24 Over TCPIP: 133x60 Oh! But why? I do not know! Also, after I exit ISPF back to TSO, the TSO screen is now correctly filling the full screen! I also note that z/VM's login screen seems to behave similarly. Over OSA-ICC the size seems to be fixed at 80x24, but over TCPIP it follows what I configured X3270 to use. Dialing a z/OS VTAM terminal through the z/OS login screen (connected via TCPIP) seems to result in a 133x60 screen both in TSO and ISPF. However if I ATTACH an OSA-ICC terminal straight to a z/OS guest, ISPF gets 133x60 but TSO only 80x24 - *but only if I reconnect to an existing user session.* If I log out and try to log in again I get IKT00405I "Screen erase caused by error recovery procedure". As you can see I am a mess when it comes to understanding how this all fits together! It seems pretty much random to me, except that TCPIP "almost always works" and OSA-ICC "almost never works". I would love to learn more, but I don't even know where to begin. Regards, ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
