The following message is a courtesy copy of an article that has been posted to comp.sys.ibm.sys3x.misc,alt.folklore.computers,bit.listserv.ibm-main as well.
Anne & Lynn Wheeler <[EMAIL PROTECTED]> writes: > 3277 had quite a bit of local intelligence ... it was possible to do > some custom stuff in the terminal that changed the repeat start-delay > and repeat ... as well as adding fifo to handle keyboard locking up if > you happen to be typing when the system went to (re)write something on > the screen. the move to 3274 controller for 3278/3279/etc terminals ... > moved all that intelligence back into the controller ... reducing amount > of electronics and manufacturing costs. with electronics moved back into > controller ... it also degraded performance and response. re: http://www.garlic.com/~lynn/2007r.html#7 IBM System/3 & 3277-1 http://www.garlic.com/~lynn/2007r.html#8 IBM System/3 & 3277-1 somebody picking around in some of the referenced old postings, sent private email asking about reference to ANR download being 2-3 times baster than DCA download ... and what was ANR ... other than APPN "Automatic Networking Routing". ANR was3272/3277 ... vis-a-vis DCA 3274/3278-9. In addition to DCA having slower human (real terminal) response ... because so much of the electronics had been moved back into controller, it also affected later terminal emulation download thruput. quicky search engine for 3277 & anr turns up http://www.classiccmp.org/pipermail/cctech/2007-September/084640.html misc. past posts mentioning terminal emulation http://www.garlic.com/~lynn/subnetwork.html#emulation as client/server started to proliferate ... the communication group made various attempts (like SAA) to protect their terminal emulation install base. when we came up with 3tier/multi-tier architecture ... we took lots of heat from the sna and saa forces. misc. posts mentioning coming up with multitier networking architecture http://www.garlic.com/~lynn/subnetwork.html#3tier for other drift ... APPN started out as AWP164. For a time, the person responsible and I used to report to the same executive. I would periodically chide him that the communication group didn't appreciate what he was doing and that he should instead work on real networking (like tcp/ip). In fact, the communication group non-concurred with announcing APPN. After some delay and escalation, the announcement letter was carefully rewritten to not state any connection between APPN and SNA. of course we were also running hsdt project ... misc. posts http://www.garlic.com/~lynn/subnetwork.html#hsdt and recent post illustrating gap between what we were doing and what the communication group was doing http://www.garlic.com/~lynn/2007p.html#64 part of the issue was that in early days of SNA ... my wife had co-authored AWP39 ... peer-to-peer networking ... which the communication group possibly viewed as competitive with their communication activity. she was then con'ed into going to pok to be in charge of loosely-coupled architecture and was frequently battling with SNA forces that it wasn't appropriate for loosely-coupled operation. She came up with peer-coupled shared data architecture ... which didn't see a lot of uptake until sysplex ... except for IMS hot-standby ... misc. past references http://www.garlic.com/~lynn/subtopic.html#shareddata recent posts mentioning ASWP39 http://www.garlic.com/~lynn/2007b.html#9 Mainframe vs. "Server" (Was Just another example of mainframe http://www.garlic.com/~lynn/2007b.html#48 6400 impact printer http://www.garlic.com/~lynn/2007d.html#55 Is computer history taugh now? http://www.garlic.com/~lynn/2007h.html#35 sizeof() was: The Perfect Computer - 36 bits? http://www.garlic.com/~lynn/2007h.html#39 sizeof() was: The Perfect Computer - 36 bits? http://www.garlic.com/~lynn/2007l.html#62 Friday musings on the future of 3270 applications http://www.garlic.com/~lynn/2007o.html#72 FICON tape drive? http://www.garlic.com/~lynn/2007p.html#12 JES2 or JES3, Which one is older? http://www.garlic.com/~lynn/2007p.html#23 Newsweek article--baby boomers and computers http://www.garlic.com/~lynn/2007q.html#46 Are there tasks that don't play by WLM's rules ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
