No, bitsavers. Do you mean http colon //bitsavers.org/pdf/ibm/3270/GA23-0059-4_3270_Data_Stream_Programmers_Reference_Dec88.pdf? /pdf/ibm/3274/GA23-0061-2_3274_Control_Unit_Description_and_Programmers_Guide_Mar85.pdf?
-- 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: Wednesday, January 15, 2020 11:29 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Talking to 3270 terminals? But a couple of minutes earlier you said: > Well, I guess the proposal was to write a piece of software that a > TN3270 client connects to and is able to exchange data with it. Do you really have a 3174? Do you have a real IBM terminal? Or another way to ask: If you created such a program, what would you be typing on when you work with the program? I think Shmuel is talking about https://secure-web.cisco.com/1hl-1uC8pqGwZWJD8gYPs-NCek47f5-NxLk2cA6HhvoJ9jiGxv8Rj4mgwlwDIJ8DwXCugcYs1lpZpkfl4Wag4m4pUQN5r0xgcesYgtJzW0RNJvui18gLxAFZ7DMq-gmqF-mm5IQr3M6vsKICPIJOLt4msO99MOeBwxyC88taYRkY9jcgSY_Xe6RWkd4KdmVhqxIgs7RG8wgu_I-YKZpOZLrFozXnXonCviXXJgm79PUwxrDikBZL9c6Fc-om9otTsjmwl58-Gb0BXNY9XOP5Ehjy-BRg3VepffkzIbW8F79aiYOlvjMoZKPFbycgNo3XYm1kwn_P3UFJLv2YmncchPx9UFTnKB1DTbQVgCv87EZ30HDuxuzqgbnkGNjBkeyFKwBycaVQ3fJGQtwaNAH4zjVKYSC9NMxiyA9lRW5SHpQJ2M8oIiBncBqOwG2TtERHL/https%3A%2F%2Farchive.org%2Fdetails%2Fbitsavers And I just noticed my old web bookmark to the 3270 Programmer's Reference is now gone! I guess I need to keep my 1990 printed manual which covered in notes and marks and sticky notes :) On 1/15/2020 8:01 AM, Alexander Huemer wrote: > I am aware RS232 is just a low-level protocol, though, if I decide to > really spend time on this, I have to interface with a 3174 somehow, > low-level. And I wonder which options I have for that, regardless of the > higher protocol layer. I am not questioning that they have to be figured > out. > > What is bitsavers? > > On Tue, Jan 14, 2020 at 07:59:49PM +0000, Seymour J Metz wrote: >> An interface to 3270 displays would be useful only if you had software that >> supported 3270 on your platform. Further, is there a real 3270 that is less >> expensive than running, e.g., TN3270, on a desktop? >> >> RS-232-C is just a protocol between a serial adapter and a modem; it doesn't >> specify, e.g., control characters, packets, going between the modems. B&T, >> Ethernet and TR all specify controls at a higher level. >> >> Your best resource for 3270 information is probably bitsavers. >> >> >> -- >> Shmuel (Seymour J.) Metz >> http://mason.gmu.edu/~smetz3 >> >> >> ________________________________________ >> From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of >> Alexander Huemer <alexander.hue...@xx.vu> >> Sent: Tuesday, January 14, 2020 4:52 AM >> To: IBM-MAIN@LISTSERV.UA.EDU >> Subject: Talking to 3270 terminals? >> >> Hi >> >> I am new to this list and would like to discuss an idea and ask several >> questions. >> >> * Did anybody ever attempt to 'talk' to 3270 terminals with something >> different than an IBM mainframe? >> >> This might sound like a strange idea, though I find it intriguing to be >> able to display content on such a terminal and be able to receive >> keyboard input from it. >> >> I guess the most straight-forward way to attempt something like that is >> to use a 3270 terminal attached to a 3174 or similar and try to talk to >> that instead of the terminal itself. I wouldn't know how to interface >> with the terminal directly over the coax. >> >> * What's the best available documentation regarding 3174 models and >> their features? >> >> I poked around on ibm.com and google but wasn't able to find much. It >> seems like there were several different physical-layer north-bound >> interfaces for 3174. Bus&Tag, Token Ring, Ethernet, RS232 (if I am not >> mistaken, for dial-up connections), maybe others? >> >> Bus&Tag doesn't seem to be a good candidate, it's difficult to interface >> with as far as I understand. >> Ethernet is way more common these days than Token Ring, though TR NICs >> are easy to procure second hand and protocol support under Linux (the OS >> I am most savvy with) is in place. >> RS232 is easy to interface with also, though then again, I am not sure >> if that interface really exists. >> >> * Did the LAN interfaces (Ethernet, TR) talk SNA on layers 2 and 3 or >> was there by any chance something going on with TCP/IP? I doubt it >> though. >> >> Talking SNA with custom software doesn't seem to be a low-hanging fruit. >> From where I stand right now I cannot say how straight-forward the >> network traffic between the mainframe and a 3174 is, how difficult it >> would be to emulate that protocol with custom software over several >> layers. >> >> * Is anybody on the list here able to provide protocol traces from the >> link between mainframe and 3174 over any interface? pcap format is >> preferred, though anything would be valuable. >> >> I would appreciate any thoughts regarding this topic, especially to the >> questions marked with asterisks. >> Also, if anything is known regarding a similar thing with 5250 instead >> of 3170 terminals, that would be interesting as well. >> >> -Alex >> >> ---------------------------------------------------------------------- >> For IBM-MAIN subscribe / signoff / archive access instructions, >> send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN >> >> ---------------------------------------------------------------------- >> For IBM-MAIN subscribe / signoff / archive access instructions, >> send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
