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.
bbreynolds <[EMAIL PROTECTED]> writes: > This thread started about the 3277-001 used on a System/3 Model 15 > (would that be a 5415?): as 3277's relied on the 3271/3272/3275 for > the major portion of their intelligence, I would assume that there > would have had to been some pretty substantial hardware in the > System/3 to make the 3277-001 believe it was attached to a > controller. I can't think how the functions would be split out on a > 3277 not on a controller; unless the 3277-001 was "gutted". Any hint > if a cable other than a simple coax connected the 3277 to the CPU? 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. several of us complained about it ... but were told that 327x terminals were targeted at data entry market and didn't have the requirements for interactive response and human factors that would be needed for something like interactive computing. as seen in some of the referenced performance comparisons ... say http://www.garlic.com/~lynn/2001m.html#19 3270 protocol ... it was much more difficult to achieve subsecond response with 3274/3278 vis-a-vis 3272/3277. However, for mvs/tso with system response already on the order of a second (or much worse) ... it was pretty negligible consideration. however, heavily loaded vm/cms systems tended to be more on the order of a quarter second (or less, one system i had care&feeding of ... was on the order of .11 seconds 90th percentile for trivial interactive under heavy load). past posts mentioning some (hardware) fixes to 3277 ... and not being able to doing anything with later 3278/3279 because even that bit of electronics had been moved back into the controller (and/or some other 3272/3277 issues vis-a-vis 3274/3278). http://www.garlic.com/~lynn/94.html#23 CP spooling & programming technology http://www.garlic.com/~lynn/98.html#49 Edsger Dijkstra: the blackest week of his professional life http://www.garlic.com/~lynn/99.html#28 IBM S/360 http://www.garlic.com/~lynn/99.html#69 System/1 ? http://www.garlic.com/~lynn/99.html#193 Back to the original mainframe model? http://www.garlic.com/~lynn/99.html#239 IBM UC info http://www.garlic.com/~lynn/2000c.html#63 Does the word "mainframe" still have a meaning? http://www.garlic.com/~lynn/2000c.html#65 Does the word "mainframe" still have a meaning? http://www.garlic.com/~lynn/2000c.html#66 Does the word "mainframe" still have a meaning? http://www.garlic.com/~lynn/2000c.html#67 Does the word "mainframe" still have a meaning? http://www.garlic.com/~lynn/2000d.html#12 4341 was "Is a VAX a mainframe?" http://www.garlic.com/~lynn/2000g.html#23 IBM's mess http://www.garlic.com/~lynn/2001b.html#12 Now early Arpanet security http://www.garlic.com/~lynn/2001f.html#49 any 70's era supercomputers that ran as slow as today's supercompu http://www.garlic.com/~lynn/2001i.html#51 DARPA was: Short Watson Biography http://www.garlic.com/~lynn/2001k.html#30 3270 protocol http://www.garlic.com/~lynn/2001k.html#33 3270 protocol http://www.garlic.com/~lynn/2001k.html#44 3270 protocol http://www.garlic.com/~lynn/2001k.html#46 3270 protocol http://www.garlic.com/~lynn/2001l.html#32 mainframe question http://www.garlic.com/~lynn/2001m.html#17 3270 protocol http://www.garlic.com/~lynn/2001m.html#19 3270 protocol http://www.garlic.com/~lynn/2002f.html#14 Mail system scalability (Was: Re: Itanium troubles) http://www.garlic.com/~lynn/2002i.html#43 CDC6600 - just how powerful a machine was it? http://www.garlic.com/~lynn/2002i.html#48 CDC6600 - just how powerful a machine was it? http://www.garlic.com/~lynn/2002i.html#50 CDC6600 - just how powerful a machine was it? http://www.garlic.com/~lynn/2002j.html#67 Total Computing Power http://www.garlic.com/~lynn/2002j.html#74 Itanium2 power limited? http://www.garlic.com/~lynn/2002j.html#77 IBM 327x terminals and controllers (was Re: Itanium2 power http://www.garlic.com/~lynn/2002k.html#2 IBM 327x terminals and controllers (was Re: Itanium2 power http://www.garlic.com/~lynn/2002k.html#6 IBM 327x terminals and controllers (was Re: Itanium2 power http://www.garlic.com/~lynn/2002m.html#24 Original K & R C Compilers http://www.garlic.com/~lynn/2002p.html#29 Vector display systems http://www.garlic.com/~lynn/2002q.html#51 windows office xp http://www.garlic.com/~lynn/2003b.html#29 360/370 disk drives http://www.garlic.com/~lynn/2003c.html#18 Early attempts at console humor? http://www.garlic.com/~lynn/2003c.html#69 OT: One for the historians - 360/91 http://www.garlic.com/~lynn/2003c.html#72 OT: One for the historians - 360/91 http://www.garlic.com/~lynn/2003d.html#23 CPU Impact of degraded I/O http://www.garlic.com/~lynn/2003d.html#24 CPU Impact of degraded I/O http://www.garlic.com/~lynn/2003e.html#43 IBM 3174 http://www.garlic.com/~lynn/2003h.html#15 Mainframe Tape Drive Usage Metrics http://www.garlic.com/~lynn/2003i.html#30 A Dark Day http://www.garlic.com/~lynn/2003j.html#24 Red Phosphor Terminal? http://www.garlic.com/~lynn/2003k.html#20 What is timesharing, anyway? http://www.garlic.com/~lynn/2003k.html#22 What is timesharing, anyway? http://www.garlic.com/~lynn/2003o.html#14 When nerds were nerds http://www.garlic.com/~lynn/2003o.html#36 When nerds were nerds http://www.garlic.com/~lynn/2003p.html#44 Mainframe Emulation Solutions http://www.garlic.com/~lynn/2004c.html#7 IBM operating systems http://www.garlic.com/~lynn/2004c.html#30 Moribund TSO/E http://www.garlic.com/~lynn/2004e.html#0 were dumb terminals actually so dumb??? http://www.garlic.com/~lynn/2004f.html#54 [HTTP/1.0] Content-Type Header http://www.garlic.com/~lynn/2004g.html#11 Infiniband - practicalities for small clusters http://www.garlic.com/~lynn/2004g.html#24 |d|i|g|i|t|a|l| questions http://www.garlic.com/~lynn/2004g.html#27 Infiniband - practicalities for small clusters http://www.garlic.com/~lynn/2004l.html#27 Shipwrecks http://www.garlic.com/~lynn/2004l.html#32 Shipwrecks http://www.garlic.com/~lynn/2004m.html#8 Whatever happened to IBM's VM PC software? http://www.garlic.com/~lynn/2004q.html#35 [Lit.] Buffer overruns http://www.garlic.com/~lynn/2005e.html#13 Device and channel http://www.garlic.com/~lynn/2005e.html#32 Stop Me If You've Heard This One Before http://www.garlic.com/~lynn/2005e.html#33 Stop Me If You've Heard This One Before http://www.garlic.com/~lynn/2005h.html#38 Systems Programming for 8 Year-olds http://www.garlic.com/~lynn/2005h.html#40 Software for IBM 360/30 http://www.garlic.com/~lynn/2005r.html#12 Intel strikes back with a parallel x86 design http://www.garlic.com/~lynn/2005r.html#14 Intel strikes back with a parallel x86 design http://www.garlic.com/~lynn/2005r.html#15 Intel strikes back with a parallel x86 design http://www.garlic.com/~lynn/2005r.html#17 Intel strikes back with a parallel x86 design http://www.garlic.com/~lynn/2005r.html#20 Intel strikes back with a parallel x86 design http://www.garlic.com/~lynn/2005r.html#28 Intel strikes back with a parallel x86 design http://www.garlic.com/~lynn/2005s.html#17 winscape? http://www.garlic.com/~lynn/2005s.html#45 winscape? http://www.garlic.com/~lynn/2005u.html#22 Channel Distances http://www.garlic.com/~lynn/2006.html#42 IBM 610 workstation computer http://www.garlic.com/~lynn/2006b.html#21 IBM 3090/VM Humor http://www.garlic.com/~lynn/2006e.html#9 terminals was: Caller ID "spoofing" http://www.garlic.com/~lynn/2006e.html#28 MCTS http://www.garlic.com/~lynn/2006i.html#34 TOD clock discussion http://www.garlic.com/~lynn/2006n.html#24 sorting was: The System/360 Model 20 Wasn't As Bad As All That http://www.garlic.com/~lynn/2006n.html#51 stacks: sorting http://www.garlic.com/~lynn/2006n.html#56 AT&T Labs vs. Google Labs - R&D History http://www.garlic.com/~lynn/2006q.html#10 what's the difference between LF(Line Fee) and NL (New line) ? http://www.garlic.com/~lynn/2006q.html#16 what's the difference between LF(Line Fee) and NL (New line) ? http://www.garlic.com/~lynn/2006q.html#58 Intel abandons USEnet news http://www.garlic.com/~lynn/2006s.html#42 Ranking of non-IBM mainframe builders? http://www.garlic.com/~lynn/2006t.html#34 The Future of CPUs: What's After Multi-Core? http://www.garlic.com/~lynn/2006t.html#42 The Future of CPUs: What's After Multi-Core? http://www.garlic.com/~lynn/2006u.html#55 What's a mainframe? http://www.garlic.com/~lynn/2006v.html#19 Ranking of non-IBM mainframe builders? http://www.garlic.com/~lynn/2006v.html#20 Ranking of non-IBM mainframe builders? http://www.garlic.com/~lynn/2007.html#14 vm/sp1 http://www.garlic.com/~lynn/2007c.html#5 old productivity response time studies http://www.garlic.com/~lynn/2007e.html#5 Is computer history taugh now? http://www.garlic.com/~lynn/2007f.html#70 Is computer history taught now? http://www.garlic.com/~lynn/2007h.html#39 sizeof() was: The Perfect Computer - 36 bits? ---------------------------------------------------------------------- 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
