test-drb July 2001

test-drb@ccmp.vtda.org

301 participants
824 discussions

Ethernet -- thicknet and thinnet before 10BaseT

by pete＠dunnington.u-net.com

On Jul 26, 19:31, Bill Pechter wrote: > > Several transceivers connected to the same cable allow several machines > > to communicate. In a sense, the transceivers together with the coax cable > > form the hub. > > > > The T-pieces are, indeed passive (all 3 connectors connected in parallel > > in the obvious way), but they're not really the hub. > > > > -tony > > It's really that the hub doesn't exist on a bus network like 10Base2 > or 10Base5... all the Tee connectors are doing is replacing > the vampire tap on thicknet... > The thinnet "Transceiver" is really built on to the card on > most PC's and is the same (basically) as the old thicknet > transceiver attached to my Sun my Unix boxes -- they can go from > Thinnet to Thicknet by swapping the N-Connector top to the > BNC connector top. And thinnet can go to thicknet with just an N to BNC > adapter -- but the max length and specs drop to thinnet specs. > > Hubs really distort the logical ethernet bus topology. Not really. Logically, the innards of the hub are the bus. The ports are the taps. Then, since the stations connected are typically some distance away, you use an appropriate technology to get the cable to them, and that's why there are additional transceivers (one on the host card, one on the hub port) to drive the signal over a resonable distance. It certainly changes the physical layout of course (short bus long drops instead of a long bus with short drops). > Now 10/100 switches really screw with it. Those switches are just bridges, which have been around for decades (albeit with fewer ports). -- Pete Peter Turnbull Network Manager University of York

22 years, 11 months

VAX 11/750 info

by xds_sigma7＠hotmail.com

Uhhhh, my 11/750 has a standard normal-looking 3 prong standard-outlet fitting plug.. It never has had a 30A twist-n-lock connector in all the time I've owned it... Is this a bad thing? Will J _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp

22 years, 11 months

Apple ][ boards -- what have I found?

by pete＠dunnington.u-net.com

On Jul 27, 23:15, Tony Duell wrote: > > On Jul 26, 18:38, Tony Duell wrote: > > > There seems to be a 6522 (on the BBC side) with the ports connected to > > > the ports of the 8255. That seems to be on the Z80 bus. > > > > I've not looked at one for a while, but that makes more sense. Presumably > > the 6522 is mapped into the Beeb's 1MHz bus space. > > Don't you mean _Tube_ address space ? :-) Er, yes, that was a typo, induced by trying to type 15 minutes of email in a 5-minute slot :-) In fact, part of the reason the Torch board causes Beebs to misbehave if Torch's own code doesn't grab it and hide it, is that the 6522 is seen by Acorn's Tube code (in the DNFS ROM) and Acorn's code will try to initialise it (and gets it wrong, of course). -- Pete Peter Turnbull Network Manager University of York

22 years, 11 months

A/UX

by dittman＠dittman.net

> >You forgot A/UX. > > Funny you should mention A/UX, I have my notebook full of original floppies > sitting here by my desk waiting to have them all imaged and put on a CDR. > Assuming all the floppies can be read, I plan to make a few extra CDRs. All my copies of A/UX came on CD. In fact, A/UX led me to buy my first CDROM drive. -- Eric Dittman dittman(a)dittman.net

22 years, 11 months

building a PDP11 from the things you find at home

by dittman＠dittman.net

> >I used to run A/UX on a II (later IIfx) and I liked it. I > >didn't find it all that much slower than running the MacOS > >straight. I can even remember playing Hellcats (I think > >that was the name; it was a WWII flight simulator) under > >A/UX and it was pretty smooth. > > Was the version you were running a C2 version? I was running A/UX 2.0/C2, > it was painful. No, I ran the standard version. Also, things greatly improved with 3.0. -- Eric Dittman dittman(a)dittman.net

22 years, 11 months

building a PDP11 from the things you find at home

by dittman＠dittman.net

> >You forgot A/UX. > > That's where I first touched both UNIX and a Macintosh, trust me, it's best > forgotten. Once that WIS Workstation was loaded with MacOS 7, it flew! > Before that it was a dog, despite being based around a Mac IIfx. I used to run A/UX on a II (later IIfx) and I liked it. I didn't find it all that much slower than running the MacOS straight. I can even remember playing Hellcats (I think that was the name; it was a WWII flight simulator) under A/UX and it was pretty smooth. -- Eric Dittman dittman(a)dittman.net

22 years, 11 months

A great day!

by fmc＠reanimators.org

"David Williams" <dlw(a)trailingedge.com> wrote: > that he has a ton of HP2000 manuals and a friend who has HP2000 > hardware he may be interested in parting with. I've wanted to work > with some HP2000 stuff again since I left high school. All in all a > good day. :-) You want to inquire about software too. The hardware is mostly HP2100-family stuff. The software is what makes it a time-shared BASIC system, and turning that up would be a Really Good Thing. -Frank McConnell

22 years, 11 months

A great day!

by dlw＠trailingedge.com

This has been a great day. First the Atari Portfolio and the BeBox. Then I'm picking up a bunch of DEC stuff from Bill here on the list but the thing that got me really excited is a co-work just told me that he has a ton of HP2000 manuals and a friend who has HP2000 hardware he may be interested in parting with. I've wanted to work with some HP2000 stuff again since I left high school. All in all a good day. :-) ----- "What is, is what?" "When the mind is free of any thought or judgement, then and only then can we know things as they are." David Williams - Computer Packrat dlw(a)trailingedge.com http://www.trailingedge.com

22 years, 11 months

Hackers: Computer Outlaws revisited

by vcf＠siconic.com

I must say I was a bit surprised at how well done the show was. It wasn't over-sensationalized at all. On the contrary, I thought it was very well researched and did a good job of telling the stories and explaining the technical stuff. I was glad that they had more quotes from Jonathan Littman than from John Markoff. Littman told Mitnick's story closer to what really was going on, while Markoff stuck to his agenda of vilifying Mitnick, which he's spent the better part of the last five years of his career doing. Markoff is the kind of reporter I despise; one who attempts to make the news or mold it in his view rather than simply report it. But I don't think Mitnick's story is as rosy as he paints it either, and I think he's spinning some revisionism on it. He's certainly got some skeletons in his past that he's not owning up to. Anyhoo, Draper's story is pretty much how I've heard it told before. He really was just an unfortunate fall guy of sorts. The warehouse where they filmed Draper is where my computers used to be stored (well, a few still are, I'm not quite done moving yet :) There were some shots of me typing on an Apple ][ (you may have noticed the "CALL -151" on the screen at one point :) but you couldn't tell who it was, just hands. The display of 1's and 0's that showed periodically was generated on an Apple ][ as well (that is, by far, the acme of my career). There was also some other stuff, like 6502 assembler scrolling by, and of course the computers they showed rotating were all mine ;) Well, that was fun. One to the next show: I'm providing some Altair footage for a National Geographic special on computer history. I'm also in the process of developing a documentary on the F14 flight control computer, but that's a slow-going affair. Once the VCF's are over for the year then I hope to kick that up into full gear. Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org

22 years, 11 months

ID these boards (pictures)

by mcguire＠neurotica.com

On July 27, Bill Bradford wrote: > Check out http://content.sunhelp.org/boards/ > > Anybody know what these might be out of? Definitely not DEC boards. Vaguely NCR-ish, but I'm really not sure. Can you put up a closeup of the backplane-side card-edge connectors? -Dave McGuire

22 years, 11 months

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test-drb July 2001