test-drb October 2001

test-drb@ccmp.vtda.org

259 participants
770 discussions

ArcNet and the Pursuit of Multiple Topologies

by mcguire＠neurotica.com

On October 9, John Allain wrote: > > a 747 was packed with DLTs and flown from > > San Francisco to Seattle. > > Such a transport could easily easily exceed 1,024 TeraBytes. > (forgot the Prefixname) What'd they need all that data for? PORN!! Ahem, sorry, I just couldn't resist. :) -Dave -- Dave McGuire Laurel, MD

23 years, 2 months

classiccmp@classiccmp.org

by cpg＠aladdin.de

On 10/09/2001 03:53:03 PM EST Dan Wright wrote: > >Dave McGuire said: >> >> IP over carrier pigeon!! > >There's even an RFC for this: > >http://www.ietf.org/rfc/rfc1149.txt?number=1149 And a proof-of-concept implementation has been done: http://www.blug.linux.no/rfc1149/ :-) :-) regards, chris

23 years, 2 months

ArcNet and the Pursuit of Multiple Topologies

by mythtech＠Mac.com

>4) Any other interesting topologies I should try? I have plans to do: >Arcnet, FDDI, Token ring, Localtalk, 10b2, 10b5, 10bT, 10bTX, 10bFiber, and >(eventually) 802.11b wireless. If you decide to do TokenRing, and need some cards... let me know... I have 3 box loads of them up for grabs (just pay shipping). I have ISA, Microchannel, and I think I might have had a PCI in there somewhere. I already got rid of the EISA ones. Oh, and I might have an HP Jetdirect card for TokenRing. Sorry, I have no hubs (they used hubs of a sort right?) or cables. And you forgot to list on your list of topologies SneakerNet, unless you never run anything around your house by foot. -chris <http://www.mythtech.net>

23 years, 2 months

IBM ROM BASIC or lack thereof

by Antonio.Carlini＠riverstonenet.com

ard(a)p850ug1.demon.co.uk wrote: >But seriously, the advantage of paper manuals is that you can read them >anywhere (like in bed, on the train, etc) , you can have them open on >your workbench (where there certainly isn't room for a PC in my case), >you can write notes all over them, etc. And I find them a lot easier to >read... All very true and I completely agree. I too generally prefer paper manuals. I would also hate to read a manual on-screen cover to cover (i.e. for anything other than reference). However, my space is restricted. I could have maybe 300 manuals within easy reach here. I have a wall-mounted CD rack with space for 300 CDs just feet away. >> >> I don't expect to read my manual on the Rainbow that I >> am repairing ... that's what the PC or laptop >Need any hints? I've got a fair idea as to what goes on inside the 'bow >(pinouts, theory, etc). Some of it is not obvious (like the disk >controller test which feeds the output of the serial chip in sync mode to >the read data pin of the FDC to check that the latter can decode data >correctly). I have the tech manuals but this is the PSU (second one which I've had die on me!) The first one turned out to be the bridge rectifier ... I found a suitable replacement and bingo it came back to life. Only a few weeks later I found somewhere that sold security bits online, one of which fits the Rainbow PSU - so at least this time I won't be sawing a slow in the screw to get at the thing! This time whatever died has taken out more of the downstream stuff. I've not had too much time to look at it - you don't happen to have the PSU schematics do you? ... I've got everything else (I think) except that. >I've never quite understood this... 20-30 years ago, most computers used >standard chips. And thus they could be copied (I am not talking about >legality here). But the schematics existed. Manuals explaining the >schematics existed. In DEC, I was told that they stopped supplying them when they noticed that customers did not want them any more (and obviously these things - especially technical manuals) cost mucho denaro to produce ... schematics must already exist obviously! This was when the customer base moved from being propeller-heads to suits. >Now we have ASICs which are much harder to copy, and yet the docs don't >exist... > >Anyway, any half-decent hacker can reverse-engineer most devices in a >couple of days at most.... The board for which I am currently scribbling software has a few standard, identifiable chips on it but the interconnections are mostly mediated by a few large FPGAs. There are also some custom ASICs in there too. The memory map is entirely decided by the FPGA. Adding and removing caps resistors and other SMT components is not too bad but playing with one of the 750-plus pin BGA devices is probably beyond the realm of the hobbyist (although re-work houses do exist, so who knows?) >> my current TV came with a five year guarantee and the >> previous one was a Decca series 80 chassis that was already >I probably have that schematic somewhere... I've got a lot of volumes of >Poole+Molloy (and its successors) on the shelf. For the record, it's a Philips 21PT5322 and the other one is a Fergusson T14R. (The latter is now out of guarantee and is therfore "fair game" ... ). Antonio

23 years, 2 months

Repair philosophy (was Re: IBM ROM BASIC or lack thereof)

by mcguire＠neurotica.com

On October 9, Mark Tapley wrote: > going to college in about 10 years, so I gotta earn tuition, and then > there's paying for the classic computer shed that the wife insists on > filling with "nice furniture" and "decorating" because she thinks of it as > a "house"....) I added a decoration a while back. It's a VAX4000-700a. Gorgeous. Functional, too. -Dave -- Dave McGuire Laurel, MD

23 years, 2 months

Squealing CRTs

by Antonio.Carlini＠riverstonenet.com

> Chris [SMTP:mythtech@Mac.com] wrote: > >I wasn't that lucky... when I did it, I shorted a cap thru my finger >(fortuantly, just thru ONE finger, tip to knuckle). I was working blind You don't need HV - large currents can be nasty too. The PSUs in some of the VAX 6000/7000 platforms are only +5V but can dump 100s of amps. You probably don't want to short one of those with your ring finger! Now for real HV - I was told by an ex-electrical engineer - that he watched while someone was measuring up for a new HV cabinet with a tape measure. The usual metal sort you or I might use for DIY. He dropped it and shorted out the busbars, instantly melted the tape and ended up in hospital with major burns across his arms and chest. Having been hit a few times by mains (240V) voltage, I've learned to be more careful and switch stuff off! Antonio

23 years, 2 months

Repair philosophy (was Re: IBM ROM BASIC or lack thereof)

by mtapley＠swri.edu

Among quite a bit of other wisdom, Tony wrote: >Heck, all I want are things like pinouts.... Ah, the pot 'o gold at the end of the rainbow! A skilled repairman, who works for pinouts.... :-) More seriously, while I aspire to fix things like Tony, I find that ignorance and lack of time are powerful disincentives. (The little one needs his diapers (nappies?) changed, and the bigger little one is gonna be going to college in about 10 years, so I gotta earn tuition, and then there's paying for the classic computer shed that the wife insists on filling with "nice furniture" and "decorating" because she thinks of it as a "house"....) I can swap modules. When I click the switch and nothing at all happens, and I have a new power supply on hand .... it's within my limited time and knowledge horizons to swap 'em. Getting an o-scope, learning how to use it, taking apart the power supply (and trusting that the little one won't ingest some of the nuts and washers while the medium-size one is getting a talking-to about sliding down the bannister with the power cord in tow).... well, that may be without my horizons. All this ranting leads to my question, to the group as a whole and Tony in particular: Is there a way I tell that it'll be safe to board-swap? In other words, are there symptoms I can in general use to tell me that the fault that caused damage was on the damaged (e.g.) board, and that therefore, if I have another example of that board, I won't fry it too by putting it into the place of the damaged one? - Mark

23 years, 2 months

ArcNet and the Pursuit of Multiple Topologies

by dhquebbeman＠theestopinalgroup.com

> In light of such, I have a series of questions: > > 1) Who knows some stuff about ArcNet? I've gotten 4 cards (8-bit ISA) and a > 16-port active hub. I've read somewhere that cards are either hubbable or > not. Any other info on that? I've never used an active hub before... and was thus limited to 4 nodes using my home-made passive hub. > 2) Anyone have any (I think it is) 93ohm coax arcnet patch cables that they > want to get rid of? I think you'll have trouble if you use anything other than 63 ohm coax... ... Formerly, the support for ARCNET in Linux was pretty week. However, there was an ARCNET/LINUX mailing list for a long time, and the members were keeping the driver sources up-to-date. The name of the list owner (or the guy cranking out the code) was, first name, Avery, last name, Pennimum or something unusal. hth, -doug quebbeman

23 years, 2 months

VMS, UCX, DHCP?

by Antonio.Carlini＠riverstonenet.com

> Paul Thompson wrote: >I think multinet supports DHCP. I am not familiar enough with TCPIP >services for VMS (UCX), however. Multinet has a hobby program. >On 9 Oct 2001, Iggy Drougge wrote: >> Now that I've got "broadband", I'd like to see my VAXstation on the net. It's >> running VMS 5.1 and UCX, but does it have any DHCP capabilities? >> It's not a great problem, but if there is some option for getting config info >> via DHCP, it'd save me the trouble of setting up a NetBSD environment in order >> to run dhclient. =) I believe that the latest UCX (TCPIP as it is now called) does support DHCP. The manuals should be around somewhere under http://www.openvms.compaq.com Antonio

23 years, 2 months

ArcNet and the Pursuit of Multiple Topologies

by DAW＠yalepress3.unipress.yale.edu

(reply at end...) ! On Tue, 9 Oct 2001, Tarsi wrote: ! > Dear all, ! > ! > I've decided that one of my goals is to run every ! > networking topology possible in my house, regardless ! > if I actually NEED to run them or not. :)... ..... ! > I currently have running 10bT ethernet, 10b2 ethernet, ! > Localtalk over PhoneNET and the beginnings of Arcnet. ! > ! > In light of such,... ..... ! > 4) Any other interesting topologies I should try? I have ! > plans to do: ! > Arcnet, FDDI, Token ring, Localtalk, 10b2, 10b5, 10bT, ! > 10bTX, 10bFiber, and (eventually) 802.11b wireless. ! > ! > Thanks folks! ! -----Original Message----- ! From: Absurdly Obtuse [mailto:vance@ikickass.org] ! ! FDDI would definitely be a good one to do. It uses dual ! counter-rotating rings. How about ATM? HIPPI? CI? ! CHANNEL-CHANNEL? ...And someone asked if _I_ was masochistic when I only asked about upgrading a 486! --- David A Woyciesjes --- C & IS Support Specialist --- Yale University Press --- mailto:david.woyciesjes@yale.edu --- (203) 432-0953 --- ICQ # - 905818

23 years, 2 months

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test-drb October 2001