test-drb August 2008

test-drb@ccmp.vtda.org

202 participants
323 discussions

by wbblair3＠yahoo.com

bfranchuk at jetnet.ab.ca wrote: > > Well, in case you wanted proper space charge tubes for > > your digital logic experiments. > > > > > The problem with them is HUGE filament current. > Pencil tubes look to be fun to play with, but you never > hear about them cause of the war. > http://home.netcom.com/~wa2ise/ Actually, 24 of the 41 types of space charge tubes had filament currents ranging from only 150 - 200 mA. The 12DL8 had the highest at 550 mA.

15 years, 8 months

Free Linux and OpenOffice - even if your email address doesn't

by mcguire＠neurotica.com

On Sat, August 30, 2008 5:11 pm, Tony Duell wrote: >> > Linux $0, *BSD $0, OpenOffice.org $0. And you don't have to be a >> > student or teacher. It's the same price no matter what TLD your email >> > address is behind. >> >> I would disagree with that - nothing is free. My time is worth >> something, >> and unless you are volunteering up your free >> time to support, it ain't free. > > My sanity and stress-level is worth something too. And having had > dealings with the so-called 'support deparetments' of several companies > including M$, I have ocme to the conclusion that it's quicker and cheaper > to support things muself. Although actually, I've found the support from > the authors of free software to be a lot more helpful in solving prolems > (whether caused by a bug in their code or not) than any company I've had > dealings with. I have to agree here. Further, any software that requires THAT much "support" is probably better off being dumped in favor of something better. And a person who consistently requires "support" for software is probably better off finding a new career. Support for free stuff is FAR better and FAR faster than trying to get useful information from minimum-wage nine-to-fivers that staff nearly all support departments nowadays. Thank you, no, I'd rather talk to the guy who WROTE the code...and with free stuff, you can do that. -Dave -- Dave McGuire Port Charlotte, FL

15 years, 8 months

OT-ish? McIlroy's "Synthetic English Speech by Rule"

by jzg22＠drexel.edu

(resending, original mail was eaten during list outage) > Replying yet again, a library search lists my university as apparently > having every volume of the Bell Systems Technical Journal on > microfilm, so if it turns out to have been published there I can fetch > it. Matter of fact, I should go check those out anyway... > > John I emailed McIlroy and asked him about this, he said the article was available publicly at either of the two big Bell tech centers back in the 1990s, but both are defunct now. However, he dug up a copy of the article and scanned it (including the errata for it) and posted it on his site: http://www.cs.dartmouth.edu/~doug/ (actual file link: http://www.cs.dartmouth.edu/~doug/speak.tar ) I'm still trying in vain to find the source code to or even a binary of his unix 'speak' command, which existed between unix v3 and v6. Only the man pages seem to have survived, as far as I can tell. John A. Wasser at DEC wrote a later semi-replacement command based on the NRL algorithm, and that one I've found. Later, in 1990 or thereabouts, John Bazik hacked 'libspeak', a library of prerecorded phonemes, onto Wasser's program. Even later, (1992), 'rsynth' was created, building on Bazik's work but replacing the prerecorded phonemes with a modified version of Dennis Klatt's old klsyn backend. -- Jonathan Gevaryahu jgevaryahu(@t)hotmail(d0t)com jzg22(@t)drexel(d0t)edu

15 years, 8 months

Schematics of Atanasoff-Berry Computer logic circuits?

by jzg22＠drexel.edu

I have here an old 1955 IBM "Manual of Instruction: Electronics" Publication 'Form 22-6253-0 (12-55: 11M-W)' which has some vacuum-tube based logic circuits in it (mostly simple stuff as the book seems to be at a high-school or undergraduate level and is mostly an overview). However, it doesn't list the resistor values (except for the card punch sorter circuit), and hence has the same issues as the schematics available elsewhere, it would seem. Should I scan it? Its about 100 pages, so it will take a while. -- Jonathan Gevaryahu jgevaryahu(@t)hotmail(d0t)com jzg22(@t)drexel(d0t)edu

15 years, 8 months

IFF (was Ring vs BCD counters for decades)

by aek＠bitsavers.org

> In a few years - the early 1950s - the IFF sets were SIF encoded, > where each aircraft or ship, when interrogated by a radar, would reply > with an octal pulse code 0000 to 3777. The interrogating radar would > then read the pulses, compare them to the code of the day, and modify > the video to the scopes automatically (AN/UPX-1, AN/APX-25, AN/UPA-24, > for those paying attention) to the operator could call the shots. I > think there are remnants of this ancient system still in use. Aviation transponder squawk codes are the obvious ones, octal, 0 -> 7777

15 years, 8 months

Wanted: vacuum tube logic circuits

by ajp166＠bellatlantic.net

> >Subject: Re: Wanted: vacuum tube logic circuits > From: "bfranchuk at jetnet.ab.ca" <bfranchuk at jetnet.ab.ca> > Date: Sat, 30 Aug 2008 17:57:30 -0600 > To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> > >William Blair wrote: >> Actually, 24 of the 41 types of space charge tubes had filament currents ranging from only 150 - 200 mA. The 12DL8 had the highest at 550 mA. >> >I remember reading somewhere on the web about the high current. I did not dig any more. >As for pencil tubes ... I suspect most of them where for WWII use and the general public did not >know about them till after transistors made their impact. > > Not quite. Tthere were several forms of pencil tubes and the smaller ones were appearing in hearing aids and others small devices just after the war. The ones that were less known were the hyper rugged ones used in the VT fuses and those were mostly secret. I have a dozen or more of the pencil types some fo the 1AD4 class with 1.5V filiments and the other the harder and more rugged types with 6.3V heaters. I"ve built gear around both. Allison

15 years, 8 months

tube logic

by rdawson16＠hotmail.com

I think I replied to the bounces link I wanted to share this guy with you, that has a nixie all in tubes: http://www.jogis-roehrenbude.de/Leserbriefe/Bruegmann-Digital-Roehren-Clock… a couple of flip flops is my starting project. I will do a spice/pspice simulation too - re-enter these schematics in Cadence Concept HDL BTW, go to linear tech for a fee spice unlimited. Dont ask me for the URL, its like asking for URL to NASA Randy _________________________________________________________________ Talk to your Yahoo! Friends via Windows Live Messenger. Find out how. http://www.windowslive.com/explore/messenger?ocid=TXT_TAGLM_WL_messenger_ya…

15 years, 8 months

book offer

by rtellason＠verizon.net

>From a conversation elsewhere, where he'd expressed some interest in this machine: > > I remember us touching on that machine once before, in offlist emails. > > I'd mentioned a book I had, and after that was digging in boxes looking > > for it. > > > > Turns out the silly thing is sitting out on a bookshelf, imagine > > that! :-) > > > > It's "Programming the IBM 1130" by J. K. Hughes. If you want it or > > know of someone who does, let's talk... > > I have it! I scoured Alibris looking for anything related to the IBM 1130 > and bought everything I could find. Hughes' book is very good. FWIW, there > is a copy at Alibris (used book seller) for $20.00 Maybe you can get a few > bucks for it. > > Richard Anybody care to offer me a few bucks for this? I can use all the help I can get, beyond shipping costs... -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter that can be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin

15 years, 8 months

Wanted: vacuum tube logic circuits

by wbblair3＠yahoo.com

William Donzelli wrote: > I have exactly one 12U7 in stock. I have a few 12K5s, as > well. I've now got a number of different dual triode tubes to try from a local electronics shop that has a large collection of tubes from former TV and radio repairmen. $1 each and they have a B&K 707 tube tester to test them on. > One thought about using space charge tubes for logic - they > might end up being slow as molasses. >From a message above, it looks like even a 6.3V plate voltage on a standard (not low voltage) dual triode tube will work and I'm after a visibly slow (a few Hz at most) multivibrator anyway with a binary counter circuit attached.

15 years, 8 months

Looking for DTC520 schematic, etc.

by jeff.kaneko＠juno.com

How about a replacement controller? I think I have a couple of these in cold storage. I think this was a SCSI to MFM bridge, originally made by Xebec or OMTI, or, I fergit. I think I had some from both manufacturers. I can check stores if you like . . . Jeff -- J Blaser <oldcpu2 at rogerwilco.org> wrote: [Repost, now that the list is back up... (Thanks, Jay!)] My old Novell 2010 CP/M computer[1] has suffered a failure in the Data Technologies Corp. DTC520 controller. IIRC, this controller can support up to 2 MFM/ST506/ST412 drives and 4 floppies. In my case it's only hooked up to a single Seagate ST-506 (5MB! Woohoo!), and a single Shugart SA450 5-1/4" floppy. Apparently this controller was not too uncommon in the day. In my case, the DTC520 is installed in the disk subsystem that's separate from the main terminal/computer, and they no longer will talk to each other. The problem seems to be related to the section that handles the IO between this controller and the CPU box. I've replaced one chip (74LS33) that was showing some serious corrosion on the pins/legs, thinking that maybe some of that had migrated into the IC die itself, but no change in behavior. It's still indicating a screwy logic level on one of the gates, but it must be coming in on the inputs. I need a schematic to help me trace the signals. I can't locate anything online. Does anyone have anything that could help me out...schematics, technical description, etc.? Many thanks. - Jared [1] Before there was Novell, Inc., the networking software company, there was Novell Data Systems (NDS), c. 1979. They had the big idea of creating a "Data Management Computer" (DMC) around a 68000, which acted as a micro-mini-mainframe for up to 24 intelligent terminals. While this project never really got off the drawing board, around 1980 NDS added (yet) another CPU to their intelligent terminal and stuck CP/M 2.2 on it. They sold a handful of these (I ended up with one) in an effort to generate a little cash flow while the 'real' project of the DMC was still in works. In the end, it was all a little too late and NDS collapsed in the latter half of 1982. It was at this point that Ray Noorda was recruited to revive the company, and in January 1983, Novell, Inc. was (re)born with the focus of networking primarily IBM PCs. The DMC, by the way, ended up becoming a file server (as opposed to Corvus', 3Com's, et al, 'disk (slice) server' technology) and the rest is history. Later, around 1988, Novell, Inc. dropped all hardware products to focus exclusively on their NetWare software. ____________________________________________________________ Save time with Cable Internet. Click here http://thirdpartyoffers.juno.com/TGL2141/fc/Ioyw6i3mDL6LyJj9bvQ6kMSZ9kulwFP…

15 years, 8 months

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test-drb August 2008