The following message is a courtesy copy of an article that has been posted to bit.listserv.ibm-main,alt.folklore.computers as well.
[EMAIL PROTECTED] (Paul Gilmartin) writes: > Anyone who believe that's a fundamental limitation of 3270 > hardware that can't be worked around: > > o Has never used VM/CMS > > o Has been brainwashed by TSO > > ... probably both. On CMS, I can type input to my program, while > it runs, in anticipation of a VM READ. I can type immediate commands > to my Rexx EXEC to turn on tracing with no ATTN nor need to wait for > in input prompt. we actually did some hardware mods to 3277 to eliminate race condition if you happened to type at the instant the system wrote to the terminal (which would lock the keyboard) ... aka 327x being half-duplex infrastructure. we complained about the change-over to 3274 controller with 3278 terminal (i.e. effectively terminal manufacturing cost reduction moving a lot of components back into shared controller). having shared electronics back in 3274 controller made 3278 terminal operations (including response) a lot slower. complaining about it basically got a response was that the significant hardware slowdown effectively wasn't noticeable since mvs (&tso) was so slow anyway that it wasn't noticeable. post with old 3272/3274 comparisons http://www.garlic.com/~lynn/2001m.html#19 3270 protocol difference als shows up later with terminal emulation and the difference between file download with "ANR" (i.e. 3272/3277) and "DCA" (i.e. 3274/3278) protocols (anr three times dca thruput) lots of past posts mentioning terminal emulation http://www.garlic.com/~lynn/subnetwork.html#emulation for some total topic drift ... old email mentioning tso product manager asking me if i would consider doing version of my resource manager for mvs/tso operation (this was after marketing division decided to start marketing CMS as the corporations strategic interactive product) http://www.garlic.com/~lynn/2006b.html#email800310 http://www.garlic.com/~lynn/2006v.html#email800310b reference in these posts http://www.garlic.com/~lynn/2006b.html#39 another blast from the past http://www.garlic.com/~lynn/2006v.html#23 Ranking of non-IBM mainframe builders? in some sense, CMS provided interactive personal computing in 60s, 70s and some part of the 80s ... but then saw personal computing starting to shift to PCs. for other folklore topic drift, cern did a report at share circa '74 about tso/cms bakeoff. internally within the company, copies of the report were classified "confidential - restricted" (i.e. available on need-to-know only) ... aka while they couldn't restrict its availability to customers ... they could restrict its availability to people in marketing and product development. ... and courtesy of the science center http://www.garlic.com/~lynn/subtopic.html#545tech virtual machines, cp67, cms (originally stood for cambridge monitor system before renamed to conversational monitor system as part of vm370 morph), gml (invented in '69 at the science center) precursor to sgml, html, xml, etc http://www.garlic.com/~lynn/subtopic.html#sgml and internal network technology http://www.garlic.com/~lynn/subnetwork.html#internalnet also used in bitnet/earn http://www.garlic.com/~lynn/subnetwork.html#bitnet here is reference discussing transformation from sgml to html at cern http://infomesh.net/html/history/early and first webserver outside europe was on slac vm370 system: http://www.slac.stanford.edu/history/earlyweb/history.shtml ---------------------------------------------------------------------- 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
