test-drb June 1998

test-drb@ccmp.vtda.org

158 participants
941 discussions

What is it called when the 60hz line power becomes something else?

by allisonp＠world.std.com

<What do you believe the frequency changed to ? (nominal 60Hz, right. <Well, anything from 50Hz to 70Hz (say) would be no problem at all). Id sueggest if you average 0hz(no power!) and 60 hs you may get someting inbetween. However the 0hz state must not exceed 8-10 cycles or you will no question get power fail. ;) Likely the power supplies dropped out whe the line voltage got below 88v. Most of those supplies will regulate down to that. However if there is also a dropout at 88V it will stop regulating as there will not be enough stored energy in the caps to hold it up. FYI: 400hz not only gets you smaller transformers it also reduces the size of the filter caps needed to remove the ripple from the rectifiers. The size and weight difference is significant when you combine the two. Allison

26 years, 1 month

What is it called when the 60hz line power becomes something else?

by DSEAGRAV＠toad.xkl.com

Ours did that Friday, and the servers aren't happy with it. I'm heading in now to clean the mess up. Just out of curiosity, is there an actual term for this? Does it sounds like BS? And, what do you think it did to the MicroVAXen... We were told this was what had happened by the power company, does it sound like BS or what? -------

26 years, 1 month

Final Xerox Star demo

by maxeskin＠hotmail.com

What processor did it use? Also, what will be done to the machine after the "last run"? >On Mon, 1 Jun 1998, Larry Groebe wrote: > >> >Is there someone to contact by phone to see if there will be videotapes >> >available? >> > >> >thanks >> > >> >Kai >> > >> >-----Original Message----- >> >From: Doug Yowza [mailto:yowza@yowza.com] >> >Sent: Monday, June 01, 1998 3:17 PM >> >To: Discussion re-collecting of classic computers >> >Subject: Final Xerox Star demo >> > >> > >> >>Xerox PARC is giving one final demonstration of the original Xerox Star >> >>workstation built in 1981. This may be the last time it gets >> >>demoed, as the hardware has begun failing due to its age. Don't miss >> >>this opportunity to witness one of the most important steps ever taken in >> >>the history of computing and user interface design. >> >> >> Better yet, has anyone given thought to the viability of building a Star >> emulator? How fast could those things have been? > >Not terribly. IIRC, there was a discernable lag between keystroke and >the appearance of the character on the monitor screen! > > - don >> --Larry >> > > donm(a)cts.com >*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* > Don Maslin - Keeper of the Dina-SIG CP/M System Disk Archives > Chairman, Dina-SIG of the San Diego Computer Society > Clinging tenaciously to the trailing edge of technology. > Sysop - Elephant's Graveyard (CP/M) - 619-454-8412 >*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--* > see old system support at http://www.psyber.com/~tcj > visit the "Unofficial" CP/M Web site at http://cdl.uta.edu/cpm > with Mirror at http://www.mathcs.emory.edu/~cfs/cpm > > > ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

26 years, 1 month

RL02 Me 2

by jpl15＠netcom.com

Well, since we have raised the topic of RL02... I have a pair that I (for some reason) would like to have hanging on my freshly-undead 11/34. I have the RL11 (M7762) and two 02s, whose 'READY' lites have '0' and '1' respectively. I have no other docs or info presently. [NOTE I would love to purchase / pay for copying / trade for these docs] I have put the controller in place of a bus grant cardlet, and have the cables properly done and the terminator on drive '1'. I have a disk pack marked RT-ll V5 that was in drive 0 when I got them, and all the hardware came as a (once working) set. I have the old 9301 boot card in now... I have a 9312 that came with the RL02 system but it causes the 11/34 to hang on power-up. From posts addressed to Zane.. I think that I have controller issues... and I certainly have no idea how to place/configure the RL11.. but at least the Magic Smoke is staying in the ICs where it belongs. *********************** Second question: I have several RT-11 disks for the RK05... they *all* boot from ODT (via the 'DK' command) but once KMON is active it gets autistic... the dot prompt appears, but any and all commands elicit the ?ILL CMD? response.... and that's it. It does this with each and every one (6 discs so far) I have the docs for RT-11 V2, and the Quick Reference booklets... and a working 11/73 with V5 on it.. so I'm a little familiar with RT-11. Does this above behavior point to anything stupid I'm doing, or......? And to think: I gave up Volunteer Bomb Disposal for this...... Cheers John

26 years, 1 month

Final Xerox Star demo

by lgroebe＠insidermarketing.com

>Is there someone to contact by phone to see if there will be videotapes >available? > >thanks > >Kai > >-----Original Message----- >From: Doug Yowza [mailto:yowza@yowza.com] >Sent: Monday, June 01, 1998 3:17 PM >To: Discussion re-collecting of classic computers >Subject: Final Xerox Star demo > > >>Xerox PARC is giving one final demonstration of the original Xerox Star >>workstation built in 1981. This may be the last time it gets >>demoed, as the hardware has begun failing due to its age. Don't miss >>this opportunity to witness one of the most important steps ever taken in >>the history of computing and user interface design. Better yet, has anyone given thought to the viability of building a Star emulator? How fast could those things have been? --Larry

26 years, 1 month

Final Xerox Star demo

by engine＠chac.org

At 15:28 6/1/98 -0700, you wrote: >Is there someone to contact by phone to see if there will be videotapes >available? Me too please? I'll be in New York on the 17th.... __________________________________________ Kip Crosby engine(a)chac.org http://www.chac.org/index.html Computer History Association of California

26 years, 1 month

Books

by rcini＠email.msn.com

On Sun, 31 May 1998 09:39:22 -0500, John Foust <jfoust(a)threedee.com> wrote: >>I think Gates & Allen's first "company" was "Traf-o-data", run on >>someone else's PDP equipment. I recall it was analyzing traffic >>data. I only remember because about the same time, I was doing >>nearly the same thing as my Eagle Scout project, summarizing >>traffic and accident data for a city. Gates and Foust, the >>ominous parallels, oh yeah. :-) I thought that it was a custom piece of hardware that they used. Maybe that was the front-end. The book "Gates" is in the attic;I'll have to get it. Rich Cini/WUGNET <nospam_rcini(a)msn.com> (remove nospam_ to use) ClubWin! Charter Member (6) MCP Windows 95/Windows Networking Collector of classic computers <<<========== Reply Separator ==========>>>

26 years, 1 month

Final Xerox Star demo

by kaikal＠MICROSOFT.com

| -----Original Message----- | From: Larry Groebe [mailto:lgroebe@insidermarketing.com] | Sent: Monday, June 01, 1998 3:34 PM | To: Discussion re-collecting of classic computers | Subject: Re: Final Xerox Star demo | | Better yet, has anyone given thought to the viability of building a Star | emulator? I've got one! It's called an "Apple Lisa" :) Kai

26 years, 1 month

Final Xerox Star demo

by kaikal＠MICROSOFT.com

Is there someone to contact by phone to see if there will be videotapes available? thanks Kai -----Original Message----- From: Doug Yowza [mailto:yowza@yowza.com] Sent: Monday, June 01, 1998 3:17 PM To: Discussion re-collecting of classic computers Subject: Final Xerox Star demo >Xerox PARC is giving one final demonstration of the original Xerox Star >workstation built in 1981. This may be the last time it gets >demoed, as the hardware has begun failing due to its age. Don't miss >this opportunity to witness one of the most important steps ever taken in the >history of computing and user interface design. > > Final Demo of the Xerox Star Workstation > 5:30 to 7:00pm > Wednesday June 17th > Auditorium Xerox PARC > > > Unquestionably, one of the major design innovations of this century >has been the Graphical User Interface, with its desktop, icons, pop-up >and pull-down menus and ubiquitous windows. The explosion of computer usage >in the last decade has in large part been made possible through this simpler >and more direct method of user interaction. > > Though millions of people around the world are now using GUIs, few >outside of the Human/Computer Interaction field or the Silicon Valley >are aware of the history of the its design prior to the introduction >of the Macintosh in 1984. > > The first GUI ever developed was the work of Dr. Douglas Englebart, >a researcher at SRI (the Stanford Research Institute in Menlo Park, CA) in the >mid-1960s. His visionary and pioneering design and prototypes succeeded in >producing the world's first screen-based windows, cursor-selectable pop-up >menus, as well as the mouse with which to interact with them. > > Though these innovations were truly revolutionary, it was not until >a decade later when researchers at the Xerox Palo Alto Research Center (PARC) >began systematically studying this system in a commericial development effort. >The Xerox Alto personal computer workstation was developed in the late 70's >and included a mouse pointing system. This system influenced later systems >such as Bravo, which was developed at Xerox PARC by Bruce Lampson and included >an integrated editor formatter. Later systems included Markup, Draw, and Star. > > Xerox Palo Alto Research Center (PARC) has been a cradle of Silicon >Valley innovation for 25 years. Its research spans domains from atoms >to anthropology, from its solid-state physics lab, which develops new >laser diodes for use in printers and copiers, to the group that studies >work practices and their possible impact on current and future products. > > Located in the Stanford University Industrial Park in the heart of >Silicon Valley, PARC was charged upon its founding in 1970 to the >"architect of the information age". Since then it has delivered into >use such significant pieces of the current information infrastructure >as laser printers, graphical user interfaces, object-oriented >programming languages, and Ethernet local area networks. PARC has >contributed to user interfaces, electronic components, embedded >software and architectures for each new line of Xerox copiers, >printers, and systems reprographics products. > > > > Directions to Xerox PARC > >>From Highway 101, take the Oregon Expressway exit west 2 miles to >El Camino Real. Oregon Expressway becomes Page Mill Road at El Camino. Follow >Page Mill Road 1.7 miles to Coyote Hill Road (no light) and turn left. Coyote >Hill Road is just past the intersection with >Foothill Expressway. Go one-half mile and PARC will be on your left. >Follow the signs to the auditorium. > >>From Interstate 280, take the Page Mill Road exit. Go east one mile >to Coyote Hill Road (no light) and turn right. Go one-half mile and >PARC will be on your left. Follow the signs to the auditorium.

26 years, 1 month

What is it called when the 60hz line power becomes something else?

by maxeskin＠hotmail.com

Who exactly decided that there was a frequency change? It seems strange that they could have known if there are no monitors to check and this is not a central problem. Of course, if this was a resonant transformer and the guy shorted it, or he hooked the transformer to a portable generator that the construction company was using, or he temporarily powered it with a solenoid using a jackhammer for a slug... >> Who knows hertz and 60 volts. A serviceman across the hall did something > >Let me guess. 60Hz and 60V. It's very difficult (I'd say impossible, but >then somebody will find a way !) to change mains frequency by miswiring a >transformer. Voltage, sure. > >Actually, I do have a device somewhere that provides the 25Hz for UK >telephone bells from the AC mains. It contains a transformer with a >winding resonated to 25Hz by a capacitor. And it's 'kicked' into >oscillations by a 50Hz mains winding on the same core. But that's hardly >the sort of thing you can make 'by accident'. > >> [When you get to the machine room, power line monitors etc.] >> Don't make me laugh! Our machine room is a closet. > >That doesn't prevent you having power line monitors. > >> Oh, and who uses 400hz for line frequency? > >I've seen it used on aircraft equipment (small, light transformers and >smoothing caps). Didn't IBM use it on some mainframes/minis? > >> >> I am officially here, by the way. CILCO is still yelling at A&B Construction >> (Or whomever they were...) and my boss wants to go help. The machines >> seemed to care more about halving the line voltage (Which I wasn't told > >Oh, indeed. Halving the line voltage will cause all sorts of problems. >Few power supplies can cope with that and give the rated outputs. > >> about) than the frequency change... >> ------- >> > >-tony > > ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

26 years, 1 month

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test-drb June 1998