test-drb

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101090 discussions

by tothwolf＠concentric.net

I guess this is only slightly OT, since this particular recorder dates >from around 1948-1950 ;) I managed to rescue a Webster Chicago model 79 wire recorder from a shelf that was overlooked in my friend's shop after most of it had been dumped into the dumpster. The model 79 was sold as a bare-bones unit without any audio circuitry, while the model 80, which used the same mechanism, was a complete unit. A little more info about Webster Chicago wire recorders can be found at [http://www.rci.rutgers.edu/~dmorton/webcor.htm], and more info about wire recorders in general can be found at [http://www.rci.rutgers.edu/~dmorton/wire_recorders.htm]. The audio circuitry that my friend built for this model 79 appears to be long gone, so in order to play back the 3 reels of wire I also rescued, I'm going to have to recreate it. I managed to found the instruction manual in a binder in the dumpster, but I don't have a service manual (though I'd certainly like to find one). The instruction manual covers the use of the model 79 and a basic design for the audio circuitry. If anyone else has a model 79 or 80, or thinks it might otherwise be worthwhile, I'm willing to scan the manual if someone has a place to host it on the web. -Toth

23 years, 7 months

EIA 232 vs. 422, Color Computers (was Re: Serial floppy drives)

by dwightk.elvey＠amd.com

>From: "Gary Hildebrand" <ghldbrd(a)ccp.com> > >Eric Smith wrote: >> >> > <snip> > Connecting EIA-232 directly to EIA-422 could let the smoke >> out of something, and we certainly wouldn't want that. >> > >ISTR that 422 was simply a balanced line version of 232. I think you >can just tie to the non-inverting line and ground and make it work. >Unless there's something else needed. > >Gary Hildebrand >St. Joseph, MO > NO!!!! RS-422 inputs should not normally excede 7V. Many RS-232 are driven with 12 volts. Also, RS-422 is offset above ground and not intended to take large swings below ground. Most RS-422 receivers do not include ground as part of their common mode operation, so you can't tie one input to ground and get it to work. Dwight

23 years, 7 months

also interesting on eBay

by pete＠dunnington.u-net.com

On Sep 6, 7:07, Andy Holt wrote: > another item on UK eBay may also be extremely interesting ... if rather > expensive: > http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=2051100106 > is a BBC Domesday setup in (mostly) working order. AFAICS the only notable problems are the scratch on the video montage disc, which might be less of a problem if the buyer solved the other problem: lack of the remote control. The remote is only used to skip through the montage (which is one of four sides), it's not used for anything else, so it's not a big deal. However, I'll make the same offer I made to the BBC mailing list when it appeared there: if the winning bidder is a list member, contact me, as I think I have a spare remote for the player. I may also have a manual (but probably not the complete set). BTW, the seller appears to have the other two interactive discs that were released for the system, in his other auctions. Of course, the LaserVision player will play "ordinary" LaserVison video discs as well. -- Pete Peter Turnbull Network Manager University of York

23 years, 7 months

[jpadilla@students.uiuc.edu: Re: p.s. Re: card reader (fwd)]

by dtwright＠uiuc.edu

Hey everyone, This is a request from someone in Aeronautical Engineering at the University of Illinois. If you think you can help him out, please contact him directly. Thanks, Dan ----- Forwarded message from "Jose F. Padilla" <jpadilla(a)students.uiuc.edu> ----- Date: Tue, 3 Sep 2002 17:29:20 -0500 (CDT) From: "Jose F. Padilla" <jpadilla(a)students.uiuc.edu> To: Dan Wright <dtwright(a)uiuc.edu> Subject: Re: p.s. Re: card reader (fwd) Dan, a shoe box full of 80 column punch cards containing an old FORTRAN code would be converted to an ASCII text file. Thanks. -Jose >=< >=< >=< >=< >=< >=< >=< >=< >=< >=< >=< >=< >=< >=< >=< Jose F. Padilla, Research Assistant and Graduate Student Department of Aeronautical and Astronautical Engineering University of Illinois at Urbana-Champaign Work: 217 244 1447; Base: 217 377 7310; Christ Delivers >=< >=< >=< >=< >=< >=< >=< >=< >=< >=< >=< >=< >=< >=< >=< ----- End forwarded message ----- - Dan Wright (dtwright(a)uiuc.edu) (http://www.uiuc.edu/~dtwright) -] ------------------------------ [-] -------------------------------- [- ``Weave a circle round him thrice, / And close your eyes with holy dread, For he on honeydew hath fed, / and drunk the milk of Paradise.'' Samuel Taylor Coleridge, Kubla Khan

23 years, 7 months

IBM Aptiva for parts

by SUPRDAVE＠aol.com

In a message dated 9/4/2002 8:41:34 PM Eastern Daylight Time, rschaefe(a)gcfn.org writes: << Move-out week is over on campus, but I decided hit a couple of alleys on the way home anyway. The only thing of interest I found was a skinless, stripped Aptiva that I nearly passed up, but then I noticed that the slots were on an active riser card so I picked it up anyway. The power supply has some extra wires on it, too. I figure these are odd enough to be hard to replace if you get a bad one. If anyone wants the parts for $postage, let me know. I've got: >> is there a machine type/model number listed anywhere? sounds like a 2168-??? model. -- Antique Computer Virtual Museum www.nothingtodo.org

23 years, 7 months

DEC T-11 evaluation board (attn: Tony Eros)

by mbg＠TheWorld.com

I haven't received my board yet (I bought the third one of them that was up at auction on ebay). Wehn it comes in I will be very interested in learning how to operate it and maybe get something running on it... Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | email: gentry at zk3.dec.com (work) | | Unix Support Engineering Group | mbg at world.std.com (home) | | Hewlett Packard | (s/ at /@/) | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 (DEC '77-'98) | required." - mbg KB1FCA | +--------------------------------+-------------------------------------+

23 years, 7 months

OT Housecleaning -- Hazeltine 1552 terminal

by zaft＠azstarnet.com

I have an old Hazeltine 1552 terminal with docs that I need to get rid of, I am cleaning house. IT DOES NOT WORK, as far as I can tell -- screen powers up filled with junk. It's probably fixable to those that are handy with such things. Anyway, anyone wants it and is willing to come get it or pay for shipping, it's yours, otherwise it goes to the recyclers next week. I'm in Tucson Arizona. Please respond offlist. Gordon Gordon Zaft zaft(a)azstarnet.com

23 years, 7 months

WTD: Microvitec "CUB" 653 service/user manuals

by philpem＠dsl.pipex.com

Hi, I'm trying to track down a Service Manual and a User's Manual for my Microvitec Cub 653 RGB monitor. Has anyone here got copies of these manuals? I'd be willing to pay for photocopying, though it would be easier for me if you could just put the manuals in a scanner and send me the resulting image files. I have access to an FTP site I could use for this purpose. Thanks. -- Phil. philpem(a)dsl.pipex.com http://www.philpem.dsl.pipex.com/ PGP Key ID: 0x0E18C95F PGP Key Fingerprint: 2741 5CB7 1D45 6F77 D1FC FA3D 7A87 2DA4 0E18 C95F

23 years, 7 months

EIA 232 vs. 422, Color Computers (was Re: Serial floppy drives)

by dwightk.elvey＠amd.com

>From: "Fred Cisin (XenoSoft)" <cisin(a)xenosoft.com> > >> > similar. 422 by the way is specified to go almost 1000 feet, while with 232 >> > you are lucky to get over 10 feet. Regards - Mike > >On Thu, 5 Sep 2002, Sellam Ismail wrote: >> That's not true. Serial cable can go for a good many feet before the >> signal breaks down (someone should pipe in with actual data ;) > >It'll handle way more than its spec calls for. When researching the >content for "RS232 Solution", Joe Campbell ran it through a couple of >thousand feet of wire (on a spool). Well, I guess that by being on a >spool, the two ends were less than 10 feet apart. :-) > > >The original IBM PC Parallel Printer Port was the one that was spec'ed at >10 feet (3 meters). I often ran 30 feet with it. >I have no idea what the spec is for 1284. > > Hi Fred Did he stretch the spools out and put a 5 PH blower that cycles on and off in each machine at the ends. I think not! There is a big difference between running a signal through a spool ( effective length for noise being vary short ) and running in a low noise environment as compared to many real world environments. In the spool, he was only looking at resistive loss and not any of the other factors. On your PC example, it was intended to run in a low noise environment. If it failed to work, IBM would simple shrug and say 'You are only suppose to run it with a nice PC and nothing else. It was never intended to be used like that.' Besides, the parallel port is suppose to be a terminated signal and not subject to issues of under driven, as in the case of RS-232. Dwight

23 years, 7 months

EIA 232 vs. 422, Color Computers (was Re: Serial floppy drives)

by dwightk.elvey＠amd.com

Hi 422 can be an impedance controlled line with terminations. 232 tends to be under driven on typical lines and unterminated. This means that an 232 signal will look like a stair case to the receiver input that on long runs may cause intermittent edges. At lower baud rates, most 232 receivers can handle this much distortion. Also, since it is under driven, the signal can be corrupted by even a small amount of outside noise. This is made even worse because it is single ended and any common mode noise can corrupt the signal. In other words, just because you ran it in your house for 30 feet and never saw an error doesn't mean it can be done in all cases. 422 is impedance controlled and can be used at baud rates up to 5 or 10 MHz ( depending on manufacturer ). It can do this until resistive losses bring the level too low to be detected. Being differential, only common mode noise that pushed it beyond the common mode will be an issue and if the noise is short term, the receivers are designed to not switch the outputs until they are brought back into the common mode. I once designed a communications bus using RS-485 ( similar to RS-422 ) lines to interconnect several machines in a noisy environment. The previous design used RS-232 and was not robust enough to work in that same environment. The lines were less than 15 feet on the RS-232. The RS-485 setup ran for over 10 years without logging a single bit of data loss ( there were several component failures during that time that don't count ). Dwight >From: "Mike Feher" <n4fs(a)monmouth.com> > > >OK, I may be wrong, ( will not be the first time) I do have the original >Mil-STD or EIA specification on these interfaces, and admit that it is not >my specialty, however, it is fact, to the best of my recollection, that 422 >will be reliable over a lot more distance than RS-232. I will dig out the >document, when I get a chance and quote actual specified numbers. Regards - >Mike > > > >Mike B. Feher, N4FS >89 Arnold Blvd. >Howell NJ, 07731 >(732) 901-9193 > > >----- Original Message ----- >From: "Sellam Ismail" <foo(a)siconic.com> >To: <cctalk(a)classiccmp.org> >Sent: Thursday, September 05, 2002 9:24 AM >Subject: Re: EIA 232 vs. 422, Color Computers (was Re: Serial floppy drives) > > >> On Thu, 5 Sep 2002, Mike Feher wrote: >> >> > similar. 422 by the way is specified to go almost 1000 feet, while with >232 >> > you are lucky to get over 10 feet. Regards - Mike >> >> That's not true. Serial cable can go for a good many feet before the >> signal breaks down (someone should pipe in with actual data ;) >> >> 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 * >> >> > >

23 years, 7 months

Serial floppy drives

by tlindner＠ix.netcom.com

Did anybody ever market a floppy disk system that communicated via RS-232? -- tim lindner tlindner(a)ix.netcom.com

23 years, 7 months

PDP-8 "Introduction to Programming"

by Antonio.Carlini＠riverstonenet.com

> I have a very ratty paper coverless copy here.:) If it's that ratty, finish the job and drop through an sheet fed scanner :-) Antonio

23 years, 7 months

DEC T-11 evaluation board (attn: Tony Eros)

by MichaelDavidson＠pacbell.net

Last month Tony Eros was asking about documentation for the DCT11-FM T-11 evaluation board. I don't have any documentation, but I do have one of the boards and am in the process of creating an annontated disassembly of the monitor program. I would be happy to share this and/or compare notes with Tony and anyone who is interested. Michael Davidson michael_davidson(a)pacbell.net

23 years, 7 months

OT: dumpster dive and water/mold cleanup

by mythtech＠mac.com

>> my Rockola >> jukebox is like that) > > >Fine machines...I used to repair/maintain them many moons ago! >Wish I could afford to buy one now. I got mine from a friend. He was moving and didn't plan to take it with him. So he said I could come get it, but had to remove it from his basement. It is about the size of a thin desk, and weighs maybe 200 lbs (it is a table top like design, not the more stereotypical upright as seen on Happy Days). So I arranged to get a pickup, and a few large friends to help haul it >from the basement. When I arrived, I found that my friend decided not to wait for me, and had put it out on curbside. I last spoke with him a week earlier, so I'm not sure how long it had been there. It had been raining all week to boot! The top had been opened by someone else, and any of the 45's that were reachable had been removed, as well as much of the carousel had been damaged from attempts to remove 45's that weren't reachable. Needless to say, I was pissed! But I took it, and spent the next two weeks on my back inside the thing, taking it apart, cleaning the rust, and repairing damaged parts. (I lucked out, the service manual was still inside, and remained mostly dry, so it was readable). It runs 99% fine now, and sounds pretty nice (very nice for an early 50's sound system, but obviously not quite as good as my surround sound system). The only problem it still has is one of the carousel selector sensors doesn't always make good contact, and if you try to play the 45 in that slot, it sometimes get stuck and just keeps spinning, never selecting the record. My guess is a spot of rust (much of it was rusted when I worked on it), but it is a pain to remove the unit, so I have ignored it for now. I still of course have to refinish the outside, as it was just totally damaged in the rain (the chrome plate rusted and bubbled off, the woodgrain siding peeled, and some decorative trim came unglued). When I buy a house, and have more room to work on it, I'll refinish the outside... but for now it lives at my parents house, and they just can't have nice things, so no sense fixing it up just for them to trash it again. -chris <http://www.mythtech.net>

23 years, 7 months

Free MicroVAX Diagnostics on 5.25" Disk (RX50)

by tsm＠palindrome.org

I have three sets of MicroVAX Dagnostics V2.1 on 5.25" disks. Also, I have one box of 10 unused RX50 disks. Anybody interested? Free to whoever will pay postage. Thanks, Terry

23 years, 7 months

OT: dumpster dive and water/mold cleanup

by mythtech＠mac.com

>> You can not reuse needles, nor can you sharpen them. With the >> acoustic-era machines, needles are used exactly *once*. Play the record, >> then pitch the needle. If you reuse needles, you will wreck the records. > >So,... >are you saying that it is also not a good idea to tape a stack of quarters >to the top of the tone arm to stop it from skipping? Since I only have the one acoustic player, I can't say for all designs. But my Victrola has a weight already attached, and a pretty heavy one at that, so I wouldn't dream of doing such a thing. As is you have to tilt the needle down into place gently or it will tip and slam the needle into the record pretty hard (hard enough to put a nice puncture wound into a finger as I learned from experiece). Although, I know of people doing that with arms for newer analog turntables. But then in every case it was either because the person had a REALLY cheap one, or they didn't realize that there was a counterweight on the back of the arm already (I've seen a few where the weight is under the plastic cover to the arm, so it isn't obvious its there... my Rockola jukebox is like that) -chris <http://www.mythtech.net>

23 years, 7 months

Free MacUser Magazines ('91 - 97') Austin, TX

by tsm＠palindrome.org

I have approximately 100 issues of MacUser from 1991 - 1997. Anybody collect these? Free for pickup in Austin, or will ship at your expense (book rate). Will put in dumpster if nobody wants. Thanks, Terry

23 years, 7 months

FWD: TRS-80 Model I up for grabs (fwd)

by ajw＠awsoftware.org

FYI ---- Forwarded Message ---- Date: Thu, 05 Sep 2002 02:35:37 -0700 From: George Phillips <gp2000(a)shaw.ca> To:trs80@cs.ubc.caCc:fverde@comcast.net Subject: FWD: TRS-80 Model I up for grabs [ trs80(a)cs.ubc.ca only accepts posts from members purely to avoid spam. I'm forwarding this one to the list since it is clearly appropriate. ] I have a TRS 80 (bought Dec 1979) and lots of magazines (Computronics), manuals, original box, some software. Does anyone want this stuff before I take it to the dump? Frank Verde fverde(a)comcast.net 410/296-7531 (Baltimore, MD)

23 years, 7 months

Teac FD-55GFR 5.25" floppy drive driver

by Sofiana810＠hotmail.com

Hi tehre, I have read your message, can you tell or give me the TEAC FD-55GFR driver. Please reply to me ASAP. Thank you very much

23 years, 7 months

Old Computers - Xerox

by kmarsh＠dnsllc.com

I was just viewing your site. I was wondering if you or anyone else would be interested in a Xerox 6085 System and a Xerox 4045 Laser CP Printer. Items included are: the Xerox 6085 CPU, 19" monitor, keyboard, infrared mouse, external 5 ?" floppy disk drive, Xerox ViewPoint Series Software (on 5 ?" floppy disks), additional 5 ?" floppy disks, Xerox 4045 Laser CP Printer, printer cable, and user manual for printer. Both are in working order. We have some photos available that I can e-mail to you if you are interested. We were thinking about putting the items on eBay, but haven't done so yet. If you would like to make an offer, please do so. I look forward to hearing >from you in the near future :-) Kathy Marsh Office Manager Distributed Network Software 3250 West Lake Road Erie, PA 16505 (814) 838-5151 8A-3P, EST, Mon-Fri

23 years, 7 months

Info on the Dynalogic Hyperion

by lbutzel＠home.com

Looking for info on the Dynalogic Hyperion, a "portable" DOS machine manufactures around 1983. At least the one I have is 1983. it was designed and initially built in Ottawa, Canada. Hyperion was acquired in about 1983 by Bytec, who was later bought by I think a Quebec company called Comterm. Anyway, mine has stopped working: The machine still boots but no image is displayed on its 7" diag screen. Hence I am looking for service info and/or persons who have worked on the machine. Any leads would be most appreciated. Leo Butzel Seattle, WA lbutzel(a)home.com

23 years, 7 months

OT/Old Recordings/Shameless Plug

by mythtech＠mac.com

>Why XP instead of 2000? My Tivo -> SVCD projects went 15-20% slower on XP >vs. 2K, so I dropped back. I *despised* that damnable kandy-koted GUI crap, >too... If you are serious about these kinds of conversions, you might want to look into the VCD burner from Terapin. Its a little pricey (about $600), but it burns directly to VCD like a VCR, and works GREAT. It also claims to bypass macrovision when duping VHS or DVD, but I admit, I have not tried to copy a macrovised item yet (I only use mine for live recording, or for saving iMovie created movies to VCD since it is MUCH faster to do realtime output via a scan converter to the VCD burner, than it is to wait for my iMac to render a VCD compatible MPEG) -chris <http://www.mythtech.net>

23 years, 7 months

RF NTSC to PAL and SECAM to PAL conversions

by mythtech＠mac.com

>I have a problem with the RF video output of some of my old micros. The use >either american or Japanese version of NTSC on VHF/UHF, and all my equipment >is PAL compatible. > >I have the same problem, with some old French micros, that use SECAM RF >output only. > >I am looking for converters but I cannot find any. Could anybody help me? There are many NTSC to PAL converters out there. J&R sells a few I know. They can also be had for fairly cheap ($40 and up). Other formats or conversion directions are a different story. PAL to NTSC is also fairly easy to find, but prices tend to start closer to $200. And anything dealing with SECAM is going to be more costly, and more difficult to locate (usually at that point, you end up getting a universal converter, and spend $500 or more). A slightly bigger problem might be getting one that works with a VHF signal... most of the ones I have seen expect it to be line composite. -chris <http://www.mythtech.net>

23 years, 7 months

Retitle: ISC S-100 Computer/Seattle Comp. Products S-100 Cards

by gstreet＠indy.net

Hello All, I'm going to repost this since this message's title was so obscure in the "Table of Contents" of messages that is included with each mailing. Back on June 9th of this year (Classic Tech Eletter #11), someone thoughtfully posted the paragraph at the bottom of this message (on this newsgroup). Coincidentally, I had already found the same S-100 computer and I eventually ended up winning the bid (luckily [I think] I was the only bidder). I only very recently received this machine (it was slightly damaged in shipping, and it _really_ was filthy! (There was an long delay in shipping it to me.) I've got the damage straightened out and I completely disassembled it for cleaning. I just got it back together last night and turned on the switch. I seems to power up and the led's come on (led near the on/off switch and 3 led's on the backplane/motherboard). I talked to one person who said that he thought that he'd had an ISC computer before, but that it wasn't pure S-100. The reason that I bought this machine is that I have some Seattle Computer Products S-100 cards that I really want to get running. They drop in the ISC "S-100" computer _perfectly_, but I have not powered it up with the SCP cards in place. If there's something that's not "pure S-100" about the ISC, I don't want to damage the SCP cards. I just checked the link (below) and it still works. I think the link will disappear in just a few more days (90 days since first posted), so I can provide the same pictures to anyone interested after the link disappears. The reason it's taken so long to ask this question is because it took over 2 months for me to actually receive the unit (now the darned link is ready to vanish, probably on Sept 10th). http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2029719366 I cannot find _any_ information about ISC Systems Corp., Spokane, WA. It's an absolutely beautifully crafted unit and from the filthy condition that I received it in--it appears to have been left running for, perhaps, _years_! The seller claimed that he'd removed the existing cards to install in his Altair, but if that's true, someone must have already substituted different cards--in the pictures, you'll notice a bunch of twisted pair and other small gauge wires: these all appear to hook up to what would seem to be "non-standard" S-100 cards, through proprietary connectors. I cannot fathom how the original ISC cards could have been of any use to anyone except the user of another ISC system. It appears that the "non-standard" wires go to things like: keyboard, monitor, modem, a network, and "LP 1" and "LP 2" (LPT 1 & LPT 2??). There is yet another connector that I've no clue as to what it might do. _BUT_, _if_ the box itself conforms to the S-100 standard, and if I can use the SCP cards, all the other wires don't matter, because they won't be connected to anything. I've really taken a liking to this machine--I hope I can use it! Any help would be much appreciated! > >At 08:33 PM 6/9/02 -0400, you wrote: >CLASSIC TECH ELETTER, Vol. 1, Issue 11 > >It's too bad the seller gutted this ISC Systems S-100 computer. If it >sells close to the opening bid, however, the buyer will get a good deal on >an S-100 starter system. (The seller's right about the system needing a >cleaning. You could knit a sweater with all the lint stuck in the fan >vent.) http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2029719366 Thank you, Robert Greenstreet gstreet(a)indy.net

23 years, 7 months

OT: dumpster dive and water/mold cleanup

by Innfogra＠aol.com

In a message dated 9/4/02 8:52:31 PM Pacific Daylight Time, tothwolf(a)concentric.net writes: > , I found a site called The Turntable Factory > [http://www.theturntablefactory.com/]. If you need advice or a source for > parts, it might be worthwhile to email them. Great Lead... Thanks The site has one of the best tutorials on refinishing clear hard plastic covers. The link is here: http://www.theturntablefactory.com/cover.html Very good info. Paxton

23 years, 7 months

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test-drb