test-drb

test-drb@ccmp.vtda.org

101090 discussions

by Lee.Davison＠merlincommunications.com

.. (and, as lab supplies, they don't get confused by being fed backwards, so I don't need the diodes)... Lab supplies have the diodes built in on both the + and - legs. running only one in "voltage source" mode, the other(s) in "current source" mode effectively. This is how any group of paralell power supplies works. So, I think if you use PSUs that have a current limiting circuit that is not only for short-circuit protection, but engages smoothly as current approaches the continuous rating of the PSU, You don't need this, in fact it can cause problems with groups of supplies hunting between Ilimit and Vlimit as load is transfered between them. you should be able to connect them in parallel with said diodes. Of course, these PSUs will not be the cheapest devices... As long as you match all the supplies to closer than the vf drop of the diodes nearly any supplies can be connected this way. However, this setup may get difficult if loading varies widely. Usually it isn't a problem as long as there is no minimum load requirement for the individual supplies. Another problem might be shutting down the entire system if one or more of the supplies fail: Use enough supplies so that one faliure is tollerable. you can then hot swap the dud supply. you wouldn't want the remaining ones to supply as much current as they can, keeping the voltage only half-way up and running your circuitry in brown-out mode. If the outputs are overcurrent protected then a faliure of too many supplies should shut down the whole thing. Trouble is it often doesn't work that way. Lee. ---------------------------------------------------------------------------- ---- This email is intended only for the above named addressee(s). The information contained in this email may contain information which is confidential. The views expressed in this email are personal to the sender and do not in any way reflect the views of the company. If you have received this email and you are not a named addressee please delete it from your system and contact Merlin Communications International IT Department on +44 20 7344 5888. ________________________________________________________________________ This e-mail has been scanned for all viruses by Star Internet. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________

24 years

The Apple I on zdnn...

by bpope＠wordstock.com

News about the Apple I auction has appeared on zdnn @ http://zdnet.com.com/2100-1106-884678.html But they don't give a link to the auction site and they don't even mention Sellams' name! But at least it's getting *some* publicity... :) Cheers, Bryan

24 years

UPS was Re: Need Burroughs Tape Spec's

by mcguire＠neurotica.com

On April 16, John R. Keys Jr. wrote: > UPS delivered my Burroughs tape unit model BU4180 yesterday but it was > destroyed. They must have dropped it from a high place as this thing > weighs in at almost 80 pounds. Things inside are pretty bad but I would > like to try and get it looking nice again, since the boards inside are > damaged I do not think I can get it to work again. Does anyone on the > list have repair manual for this model? I would like to see how he belts > go around the pulleys inside the case. Thanks I'm wondering how UPS manages to stay in business anymore. I've shipped about four things via UPS in the past year, and EVERY ONE OF THEM arrived damaged to some extent. WTF?? -Dave -- Dave McGuire "Mmmm. Big." St. Petersburg, FL -Den

24 years

UPS was Re: Need Burroughs Tape Spec's

by Huw.Davies＠kerberos.davies.net.au

At 12:31 PM 16/04/2002 -0400, r. 'bear' stricklin wrote: >Here's a data point for you. And another (Australian one). Years ago when RZ28s were new disk drives and StorageWorks was a new concept I was Senior Systems Programmer looking after a VMS cluster (this story is sufficiently old it might even be on topic :-). In those days RZ28s in SBB were about AUD$3K and we'd ordered 20. My office overlooked the loading bay and I watched in horror as the delivery driver DROPPED the disks off the back of the truck onto the ground (say 4 feet). He couldn't understand why I wasn't going to sign for the delivery - I told him to take them back. Digital changed their preferred courier shortly thereafter..... Huw Davies | e-mail: Huw.Davies(a)kerberos.davies.net.au | "If God had wanted soccer played in the | air, the sky would be painted green"

24 years

TTL computing

by tim＠snowgoons.fsnet.co.uk

>From: "Richard Erlacher" <edick(a)idcomm.com> >Date: Mon Apr 15, 2002 03:45:30 am Europe/London > >> Actually, I can see one way that there could be a benefit from >> using TTL.... >> >> The current advances in processor speed have come largely from just >> increasing the clock rate. There haven't been any major changes in CPU >> design to use those clock cylces more efficiently.... > >That's only a small part of the acceleration. The use of multiple piplelines >accounts for much of the performance increase along with increased >datapath width, and other little features. The gradual increase in interest in >parallelism is also going to help quite a bit, so we'll be seeing even more >pipelines in the future. > >> But somebody stuck with old, slow, TTL, just might hit on some way to get >> more performance out of it (because it's all they've got, and they need >> the performnce). The trick they discover just might also be useful to >> speed up ASICs (or FPGAs, or ...) >> >And just exactly HOW would they extract more performance from it? A new >architecture would require new software, both in development tools >and in OS and as applications. Just verifying that their innovation would >take several hundred lifetimes, and the generation of a full set of software >would take that one individual working alone, until well after the next big-bang. I've been keeping out of this conversation so far 'cos I'm not qualified to comment on much of it <grin>, but this statement strikes me as just being Plain Wrong. Your own example of pipelines is a perfectly good example of something which could easily have been invented by someone in their back room building a processor out of TTL. OK, the resultant processor would not be commercially viable, but it would serve perfectly well to demonstrate the theoretical concept and a practical embodiment of it. Enough for the patent application you'd file before taking it to Intel to commercialise, for example! The argument that anyone interested in new architectures is wasting their time ('mentally masturbating' as you so delicately put it,) is entirely specious IMHO. The first stage is always proof of concept, commercialisation is an entirely different game. I doubt the researchers on quantum computers are going to give up and go home because the first devices they produce are the size of a room, require liquid nitrogen to run and - heaven forfend - don't run Windows 2000 or Microsoft Office. If a new architecture offers significant enough benefits, the software support and everything else necessary to capitalise on it will follow. Cheers, Tim. -- Tim Walls at home in Croydon - Reply to tim(a)snowgoons.fsnet.co.uk

24 years

OT Letting it go (was Re: The CommodoreOne is near!)

by acme_ent＠bellsouth.net

> From: Christopher Smith <csmith(a)amdocs.com> > > From: John Chris Wren [mailto:jcwren@jcwren.com] > > > But then, one thing I have noticed about the list, > > besides being an > > excellent wealth of information and intelligent people, is > > that some don't > > know when to let something end. > > You can count me in that category. I wonder whether it's typical > of the kind of person you'd find on this list? > > As a general observation, technical types tend to push things > further than most people appreciate in several cases. > > Chris That's because we want to be *right.* It took me a long time to learn that I'd rather be happy than right. Glen 0/0

24 years

Calcomp Ethernet Adapter M971L - Volunteer repair/Anybody got one spare?

by Arno_1983＠gmx.de

So this is going into the third - and, hopefully, last - turn. We had concluded that there is something wrong with the Ethernet adapter on our Calcomp CCL 600 ES laser printer. Now it's even worse - the printer locks up when the interface is installed and does no longer react to its front-panel buttons (On/Offline etc.) On the NIC, the lights for IP and DATA stay lit as long as the printer is on. We don't have the time and the knowledge here to start trying to repair that board, so we hope that somebody out there on the list might throw one in (pref. for shipping costs or little money, but place your prices), or does anybody feel like trying to repair it? Shipping would be from/to Nuremberg, Germany; or, if exchange at the VCF Europe in Munich is possible, I'll show up there and handle things. I'm on digest mode and have no Inet on the weekend, so my answers will be delayed a bit. Thanx in advance Arno Kletzander Arno_1983(a)gmx.de -- GMX - Die Kommunikationsplattform im Internet. http://www.gmx.net

24 years

Looking for info on an HP-IB cable

by fmc＠reanimators.org

Dan Veeneman <dan(a)ekoan.com> wrote: > I recently picked up an HP-IB cable, made by HP, with a > part number of 12009-60015. One end is an HP-IB connector > and the other end is a 15-pin card edge. > > Any ideas what device this cable connects to on the card edge end? A 12009A card, which is an HP-IB interface for L/XL/A-series HP 1000 computers. -Frank McConnell

24 years

A2065 Ethernet

by ghldbrd＠ccp.com

I picked up a PCI ethernet card today that is both 10 Base T and 10 Base 2 outputs. Now I will have a crash (bad term) course in networking, especially across different platforms. I'm wondering if this card is capable of using both outputs at once; i.e. base 2 to my Amiga Etherrnet and base T to a cable modem or hub. If it is an exclusive OR situation, I guess I'll have to get another NIC for another input/output. If all else fails, then I put Linux in the Amiga . . . . . Gary Hildebrand St. Joseph, MO

24 years

Download CD images for RSX-11 and RT-11 Freeware CDs from Tim Shoppa

by jhfinepw4z＠compsys.to

>"William R. Buckley" wrote: > Over the past year, I have sent several messages to Tim Shoppa > requesting a set of CD ROMs containing the offerings of his at > the web site, metalab.unc.edu, yet to date I have not received > the requested material. I have also sent email to Tom directly > but, he has not answered. Is there some extenuating circumstance > of which others on this list are more familiar than I? > William R. Buckley, Director Emeritus > International Core Wars Society Jerome Fine replies: It took a week of trying, but I have finally downloaded all three CD images for RSX-11 and RT-11 from: ftp://ftp.trailing-edge.com/pub/cd-images/ Note also that the file MD5SUMS seems to contain checksum values, but I don't know how to use these values or produce them myself to check if my files are correct. Can anyone help? The best time seems to be at night. Please realize that these are 650 MByte files and will take many hours in most cases, let alone a whole day (or three) if you do not have a high speed connection like DSL. Sincerely yours, Jerome Fine -- If you attempted to send a reply and the original e-mail address has been discontinued due a high volume of junk e-mail, then the semi-permanent e-mail address can be obtained by replacing the four characters preceding the 'at' with the four digits of the current year.

24 years

The CommodoreOne is near!

by csmith＠amdocs.com

> -----Original Message----- > From: James B. DiGriz [mailto:jbdigriz@dragonsweb.org] > > Um, I think this is getting pretty bad. [...] > Chris, no offense, but get a grip. I'm kicking myself for > leaving room > for any unintentional humor in my comment, but maybe people > are reading > things into this thread that just aren't necessarily there? Perhaps -- I think you're reading more into my comment than was necessarily there. :) (Given that you stripped the entire qualifying couple of paragraphs out...) I have no problem with your comment, myself, or others' comments for the most part. I was only implying that I think we should try not to offend most people too much. Of course it won't always work, but such is life. In other words, Dave and Sridhar can say whatever they like one to the other, all in jest, and it can be understood as such. No problem. It's not so good when the target of the jest, or even a third party -- JCW in this case -- can misunderstand that jest to be disrespect. Anyway, I, for one, wouldn't want somebody making inflatable likenesses of myself... ;) > That's a big > problem with humor, why it is unprofessional and should be avoided in > the workplace, and why I should have proofed myself better. I think that's a bit too general. Certainly there's nothing you could possibly say that wouldn't offend _somebody_. > How about we just drop this whole subject? Hmm -- Ok. Chris Christopher Smith, Perl Developer Amdocs - Champaign, IL /usr/bin/perl -e ' print((~"\x95\xc4\xe3"^"Just Another Perl Hacker.")."\x08!\n"); '

24 years

ALU IC information?

by BFeely＠aol.com

I am trying desperately to find a datasheet for the obsolete semiconductor 74F582. All I know is that it is a 4-bit ALU. I would appreciate it if someone could possibly e-mail me a copy. It would even be good if it was another 7400 logic type, as all the families have the same functions.

24 years

cure equiepement that was in the rain... best practices???

by dquebbeman＠acm.org

> On Mon, 15 Apr 2002, Dave McGuire wrote: > > > TLC it performs flawlessly). The water doesn't seem to do any harm at > > all, even with long-term exposure...it's the crap that the water can > > carry into the equipment, and sometimes corrosion later on. > > So what can you do with accumulated mineal salts around component > legs? Looks like tin "rust". I tried firm-but-gentle with a stiff > toothbrush, and didn't get anywhere. > > I have that MV3100-90 board that I think just needs the corrosion, > which I suspect is conductive, removed. Using a small area of the board where you could correct any damage that this substance might cause, try a little CLR... it's a mixture sold throughout the midwest (U.S.) that dissolves Calcium, Lime, and Rust deposits. Phosphoric acid is one of its components... so be real careful. I've never used it on PC boards before, but it can't be beaten for removing corrosion off metal parts. Regards, -dq -Douglas Hurst Quebbeman (DougQ at ixnayamspayIgLou.com) [Call me "Doug"] Surgically excise the pig-latin from my e-mail address in order to reply "The large print giveth, and the small print taketh away." -Tom Waits

24 years

OS/2 running under VMWare, or other emulator for Windoze

by csmith＠amdocs.com

> -----Original Message----- > From: Sridhar the POWERful [mailto:vance@ikickass.org] > Bochs is not a good idea on that machine. Bochs is meant to run on > non-PC's and it's a complete PC emulator. What he wants is > Plex86, which > is the system virtualization stuff from Bochs, with none of the PC > emulation stuff. He already has all that. Last I heard, Plex86 was still in the "concept only" stage. Is that information outdated, then? Chris Christopher Smith, Perl Developer Amdocs - Champaign, IL /usr/bin/perl -e ' print((~"\x95\xc4\xe3"^"Just Another Perl Hacker.")."\x08!\n"); '

24 years

Explain the NeXTStation "dim monitor" problem, etc...

by dquebbeman＠acm.org

> First off -- can somebody explain the common problem with the > monitors going dim? Can I fix it? (How?) Is there an internal > "intensity" pot that I can adjust to get more life out of the > monitor? It is just bright enough not to strain your eyes at > the highest brightness setting right now... (It's B&W) I have always assumed that the electrons just kick the sh*t out of the phosphor, and the the phosphor just dies... but I hope that's wrong, and that something can indeed be adjusted or replaced (other than the daggone tube itself). -Douglas Hurst Quebbeman (DougQ at ixnayamspayIgLou.com) [Call me "Doug"] Surgically excise the pig-latin from my e-mail address in order to reply "The large print giveth, and the small print taketh away." -Tom Waits

24 years

OT email response format (was Re: TTL computing)

by csmith＠amdocs.com

> -----Original Message----- > From: Dave McGuire [mailto:mcguire@neurotica.com] > So, why don't you use a real mail client...? ... because restrictions here are such that they don't mind me using their pipe for personal things in a limited manner, but they really hate for people to put any software on their system (typical windows-using mindset, but let's not get into that :), and I'm really trying to play by their rules. They have no real mail client, in fact their installations of lookout(!) are even more broken than usual. Chris Christopher Smith, Perl Developer Amdocs - Champaign, IL /usr/bin/perl -e ' print((~"\x95\xc4\xe3"^"Just Another Perl Hacker.")."\x08!\n"); '

24 years

Download CD images for RSX-11 and RT-11 Freeware CDs from TimShoppa

by dquebbeman＠acm.org

Jerome writes: > There is a hobby version of Ersatz-11 which can be downloaded > for free: http://www.dbit.com/pub/ > You will want to download at least /e11/ and /putr/ followed by > those portions that you want to initially focus on. ... > The commercial version does cost $ US 2999 for DOS/W95/W98/NT. Well, considering what John's done for the emulator movement I can't call that predatory pricing. If the market is there, then so be it... BTW, I realize we have many consultants on this list who can justify that cost as a business expense. I also realize people of various means are on this list. I do confess to wishing I had more "leverage"; I hope that doesn't get taken as class jealousy. > In particular, I am allowed to use a raw SCSI hard disk drive by: > MOUNT DU0: SCSI5: > where "5" is the SCSI ID of the SCSI hard drive. This allows me to > use the same SCSI hard disk drive with both Ersatz-11 and on > a real PDP-11 system. Ken Harrenstein's KLH-10 has this ability, although I haven't used it yet. It sure would be nice if someone would do a commercial HP2000/2100 emulator and be able to cripple it slightly for those hobbyists who'd like to run one. Yes, Bob, I read your message, but I had something else in mind... ;) -Douglas Hurst Quebbeman (DougQ at ixnayamspayIgLou.com) [Call me "Doug"] Surgically excise the pig-latin from my e-mail address in order to reply "The large print giveth, and the small print taketh away." -Tom Waits

24 years

Explain the NeXTStation "dim monitor" problem, etc...

by csmith＠amdocs.com

Ok, I've got my NeXTStation working, but I'm in need of some advice. First off -- can somebody explain the common problem with the monitors going dim? Can I fix it? (How?) Is there an internal "intensity" pot that I can adjust to get more life out of the monitor? It is just bright enough not to strain your eyes at the highest brightness setting right now... (It's B&W) Next, can anyone tell me why, after booting into single user mode, and changing the root password with 'nu -m' I might still be refused a login next time I boot? I was able to get in once yesterday, after which I tried this morning and was refused. I booted to single user mode again -- looked at the current password hash, changed the password again (the hash turned out different, but I'm not sure that means much really, and could just be different "salt"), booted again normally, and still couldn't get in. So... is there a possibility that either: A) It's getting another password from somewhere and overwriting the one I put in? (I hope not.. :) or... B) Something's not starting right during boot right now, and it needs this to log people into the system? (More likely, I think...) It does still want to connect to the network, and complains about not being able to talk to several machines when it boots. I'm not sure whether this would make a difference, or how I would convince it not to do this. :) Any suggestions? Chris Christopher Smith, Perl Developer Amdocs - Champaign, IL /usr/bin/perl -e ' print((~"\x95\xc4\xe3"^"Just Another Perl Hacker.")."\x08!\n"); '

24 years

OT email response format (was Re: TTL computing)

by acme_ent＠bellsouth.net

> From: John Foust <jfoust(a)threedee.com> > Unfortunately, I don't think Winston said anything > about the inability to format e-mail responses > in conventional style, so we're stuck. "see below, plz." > now induces an immediate "CTRL/D" from my left hand. Okay, so what is the *preferred* method of replying to classiccmp posts? Reply at top? Replay at bottom? Or, embedded comments interspersed throughout the replied-to post? I prefer the latter, more conversational style . . . Glen 0/0

24 years

Looking for info on an HP-IB cable

by dan＠ekoan.com

Hi, I recently picked up an HP-IB cable, made by HP, with a part number of 12009-60015. One end is an HP-IB connector and the other end is a 15-pin card edge. Any ideas what device this cable connects to on the card edge end? Google isn't very informative with this one. Cheers, Dan www.decodesystems.com/wanted.html

24 years

Explain the NeXTStation "dim monitor" problem, etc...

by mcguire＠neurotica.com

On April 16, jpero(a)sympatico.ca wrote: > I know phosphors becomes fried slowly from long use but I'm referring > to cathode emissions: > > I wondered whom is right? > > cathode oxide or > heater coating? > > I think this is heater coating. Wouldn't this be an issue of indirectly heated vs. directly heated, i.e. having a cathode with an electrically isolated filament inside vs. just a filament acting as the source of electrons? Some filament-only tubes do have a coating, much the same as the cathode coating I believe. Though I've never seen a CRT with no cathode. -Dave -- Dave McGuire "Mmmm. Big." St. Petersburg, FL -Den

24 years

Need Burroughs Tape Spec's

by dquebbeman＠acm.org

> UPS delivered my Burroughs tape unit model BU4180 yesterday > but it was destroyed. They must have dropped it from a high > place as this thing weighs in at almost 80 pounds. Things > inside are pretty bad but I would like to try and get it > looking nice again, since the boards inside are damaged I > do not think I can get it to work again. Does anyone on the > list have repair manual for this model? I would like to see > how he belts go around the pulleys inside the case. Thanks You are admirably mellow. In lieu of tasting the blood of the a**hole who did this, I'd want everyone who handled that package fired from UPS, Hell, everyone who *might* have handled it, except for the one I'd have the rapport with, the delivery guy. Don't tell me this was a 7-track drive, or I'll weep profusely... -dq -Douglas Hurst Quebbeman (DougQ at ixnayamspayIgLou.com) [Call me "Doug"] Surgically excise the pig-latin from my e-mail address in order to reply "The large print giveth, and the small print taketh away." -Tom Waits

24 years

Champaign trip (aka DEC Galore)

by csmith＠amdocs.com

> -----Original Message----- > From: Mzthompson(a)aol.com [mailto:Mzthompson@aol.com] > No doubt, Chris spent yesterday evening going through the > carload of stuff > I took over to him. I'll let him tell about that. Don't let him get Actually, I spent yesterday evening cleaning plaster dust out of my room, since the ceiling decided it was a good time to come loose in one spot, and fall down on my keyboard, minidisc player, apple newton, etc, etc... I did boot the NeXTStation (which now has a monitor cable and mouse, thanks to Mike), and get the XTerm talking to one of my other systems. (... Now if I can just figure out how to service XDMCP requests with GDM) > away with calling it his 'latest haul', because he didn't, it was > 'home delivery'. :) Indeed... > The big sour note, I recognized some single drive expansion > boxes. However, > the DEC badge had been replaced with a Compaq. Compaq > actually went to > the trouble of having the plastic badge inserts remade in their image. > Fortunately, I had not yet had lunch. Heh. Chris Christopher Smith, Perl Developer Amdocs - Champaign, IL /usr/bin/perl -e ' print((~"\x95\xc4\xe3"^"Just Another Perl Hacker.")."\x08!\n"); '

24 years

VCF Apple-1 Auction 4/19-4/21

by vcf＠siconic.com

The VCF is auctioning off another Apple-1 computer. Complete information on the auction can be found here: http://www.vintage.org/special/apple-1/ The auction will take place from April 19 through April 21. See URL above for complete information. -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org * Old computing resources for business and academia at www.VintageTech.com *

24 years

TTL computing (link to) Re: Fuse PROM

by mtapley＠swri.edu

Fred wrote (about a demo PROM with visible links): >How about using circuit breakers? >Then you would have a manually erasable PROM, without further expenditure >each time that you program it. Then Richard wrote (about the distinction between hard-, firm-, and soft-ware): >It happens that some folks differentiate >between hardware and firmware based on whether you can touch it or not. You >can't touch firmware, at least not in a practical sense, just as you can't >touch software. Hmmm. If the circuit breakers are the type that pop out a button when they break, I *could* touch software, after it was programmed into the circuit-breaker PROM. Actually, if things were set up *just* right, I could arrange to be hit over the head by software (as it was being written to PROM). Do we need a new name for this device? FEPROM (officially Finger Erasable Programmable etc., but we all know it's really Fred's Erasable etc.)? - Mark

24 years

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