I especially liked the 3066. It was a huge CRT, about a yard square, that operated like the 3215. You had to press Request to get a Read posted (either VM or CP, depending on your settings), enter your command and then press Enter - just like the Telex TTY terminals. There was only line mode entry. I preferred using one of the remote 3215 consoles because the 3066 was not only large, it was situated high for those who used it while standing up. It caused neck pain and eye strain to use it while sitting. And sitting was necessary for a long programming session.
Regards, Richard Schuh > -----Original Message----- > From: The IBM z/VM Operating System > [mailto:ib...@listserv.uark.edu] On Behalf Of Alan Altmark > Sent: Friday, February 06, 2009 2:05 PM > To: IBMVM@LISTSERV.UARK.EDU > Subject: Re: lOGON WITH OUT ipL'ing > > On Friday, 02/06/2009 at 03:16 EST, Jack Woehr <j...@well.com> wrote: > > Here's something I never knew: Is that why the terminal "hangs" (my > unixy > > interpretation for the past 15 years) after you IPL ... so you can > > enter special commands before your CMS guest actually > loads? Is that > > VM READ part of CMS or CP or something in-between? > > It's a symbiotic relationship. When you XAUTOLOG something, > CP assumes it is CMS and stack an null line in the console > input buffer. He does that > because CMS likes to issue a READ to the console when you > IPL. XAUTOLOG > userid#data causes "data" to be place in that buffer instead > of a null, in case you want something like XAUTOLOG > userid"#ACC(NOPROF. > > After CMS is up, the READ is controlled by SET AUTOREAD. If > SET AUTOREAD ON (the default for XAUTOLOGed users), CMS will > issue a console READ when it is ready for the next command. > You can SET AUTOREAD OFF so that CMS does NOT issue the READ > immediately. Instead, he waits until you press ENTER to read > from the console. > > It works like that so that, as Richard says, you could safely > enter a command whenever you wanted, but not prohibit > asynchronous CP-generated console messages at other times. > Essentially the same as pressing the ATTN key. > > Secret Squirrel Stuff: If an application is running and is > prompting you for data, how do you HX? Obvious Answer: Press > Cursor-Left (once) followed by ENTER. You can now issue HX, > HI, HT, or any other immediate command and have CMS obey it, > not hand it to the application. I guess maybe we should > classify it as "a CP Easter egg" or "VM cheat". :-) > > The three-fingered salute is child's play compared to the way > acolytes had to grovel to be Speaker to Machines. Sometimes > I am amazed at the amount of code we devoted to dealing with > a half-duplex console (3215), subsequently simulated on a > full-duplex device (3270), in an environment where your > console can be "stolen" out from under you. All from the > Before Times when the Ancients were still able to IPL 190 on > the hardware and use CMS. > > Impressive. > > Alan Altmark > z/VM Development > IBM Endicott >
