test-drb

test-drb@ccmp.vtda.org

101090 discussions

by ajp166＠verizon.net

> >Subject: Re: Q-bus to CF [was: IOmega] > From: woodelf <bfranchuk at jetnet.ab.ca> > Date: Mon, 03 Mar 2008 11:48:16 -0700 > To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> > >Bob Armstrong wrote: >>> Sridhar Ayengar (ploopster at gmail.com) wrote: >> >>> Or if you're willing to write an MSCP layer into your controller firmware. >> >> I actually think this is the "right" way to solve the problem in the case >> of the PDP-11 and VAX, but then controller is no longer a simple device. > >The question is who is the interface for. Is this like the SCB1620 interface to provide >a hard drive to a small system that may not have any other major storage device, >or is this for a commercial system that has a *Standard* I/O allready? For commercial you have to deal with the holder of the MSCP intellectual rights. The other issue is MSCP is an intelligent system that has DMA and is able to run linked lists for queued IO.The pro for MSCP is most all of the DEC OSs had drivers for it. The minus is complex, firmware intensive, DMA and temporary bus master and it would try to do some of the buffering that IDE drives already do well. Simple IDE/CF to Qbus(Ubus)... design is near complete copy of a bdirectional parallel port described in the Small Computer Interfacing Manual with a bit more to look like IDE bus and isolate reads and writes. Minus here is the IO is slower using PIO (but still faster than RX02), a driver is required for most OSs. The plus is simple to construct, the driver needed is very simple, if CF is used the board and a 32MB CF is a complete package with as much space as many small Qbus 11s ever had! I'd suggest to anyone that does this a basic boot rom on the board is a sane thing. For RT11, the DD (tu58) driver would make a good prtotype as would the HX previously mentioned. The RT-11 docs cover creating new drivers and VMS docs too. NO, I don't volenteer, way too much going on right now. Allison >> Bob >PS: I was reading the 1966 PDP 8 user handbook, I am finding usefull programing >information since they give real detail in I/O devices. >Any ideas on how impliment POWER on fail IRQ and restore? First you must have core or ram that looks like core (doesn't lose data on power fail). The assumption for real PDP-8 is always core and program in core.

18 years, 1 month

I've got MS Money version 3

by michel.rougie＠gmail.com

Hello Kelly Found today your oooooold message. I still use Money 3 since 1994 even with my new dual core Centrino! It's really the best personal finances management tool! If you steel need the install disk, I can help you! Kind regards Michel from Paris --------------------------------------------------------- Kelly Leavitt <mailto:cctalk%40classiccmp.org?Subject=Looking%20for%20MS%20Money%20version %203&In-Reply-To=> CCTalk at catcorner.org Thu Mar 31 19:13:10 CST 2005 * Previous message: <http://www.classiccmp.org/pipermail/cctalk/2005-March/190775.html> 10base5 (Thick) Terminator ? * Next message: <http://www.classiccmp.org/pipermail/cctalk/2005-March/190802.html> D.G. Nova update (boo f'ing hoo) * Messages sorted by: <http://www.classiccmp.org/pipermail/cctalk/2005-March/date.html#190777> [ date ] <http://www.classiccmp.org/pipermail/cctalk/2005-March/thread.html#190777> [ thread ] <http://www.classiccmp.org/pipermail/cctalk/2005-March/subject.html#190777> [ subject ] <http://www.classiccmp.org/pipermail/cctalk/2005-March/author.html#190777> [ author ] _____ Copy right is 1996, so it is almost on topic. Does anyone have an install disk for this? A very good friend of mine needs to move his data to a new computer this weekend and he can't find his install disk. What amazes me is that he's been running this since 1996 without losing data once. Thanks for any help, (let the scolding begin) Kelly _____ size=2 width="100%" align=center> * Previous message: <http://www.classiccmp.org/pipermail/cctalk/2005-March/190775.html> 10base5 (Thick) Terminator ? * Next message: <http://www.classiccmp.org/pipermail/cctalk/2005-March/190802.html> D.G. Nova update (boo f'ing hoo) * Messages sorted by: <http://www.classiccmp.org/pipermail/cctalk/2005-March/date.html#190777> [ date ] <http://www.classiccmp.org/pipermail/cctalk/2005-March/thread.html#190777> [ thread ] <http://www.classiccmp.org/pipermail/cctalk/2005-March/subject.html#190777> [ subject ] <http://www.classiccmp.org/pipermail/cctalk/2005-March/author.html#190777> [ author ] _____ <http://www.classiccmp.org/mailman/listinfo/cctalk> More information about the cctalk mailing list

18 years, 1 month

seven segment display history

by dm561＠torfree.net

--------Original Messages: Date: Fri, 29 Feb 2008 23:22:16 -0800 From: Brent Hilpert <hilpert at cs.ubc.ca> Subject: Re: seven segment display history To: General at priv-edmwaa04.telusplanet.net, "Discussion at priv-edmwaa04.telusplanet.net":On-Topic and Off-Topic Posts <cctalk at classiccmp.org> Message-ID: <47C90428.4A52403B at cs.ubc.ca> Content-Type: text/plain; charset=us-ascii Ethan Dicks wrote: > > I have something like that with me here in my bag-o-parts... approx 20mm > by 30mm, with a 2mm-thick body made of a rough, dark ceramic, with a 1mm > thick glass top. It's a 2.5 digit display with + and -. All the leads > come through the back of the package in what appears to be a straight- > through fashion (making it easy to figure out how to hook it up). > > There is a vendor and part number etched on the face: Sperry SP-738. > > I've never tried to hook it up to anything, and have no idea what > voltages it might want. It's a shame it's only 2.5 digits; if it > were 3.5 digits, it might make an interesting 12-hour clock face. > Not sure what I'd need to do that swings from -199 to +199 off the > top of my head. Temperature? Your description sounds like the Sperry/Beckman gas-discharge displays, e.g.: http://www.tube-tester.com/sites/nixie/trade08-panaplex.htm I think your part number is in there. Can be cascaded with more digits, or a lot of early DVMs were only 2.5 digits. ----------------Reply: A little tricky to interface because of the high voltage, keep-alive anodes, etc. I may have some of the driver chips though if you're serious. mike

18 years, 1 month

VAXstation/MicroVAX 2000 CPU/FPU overheating?

by ajp166＠bellatlantic.net

> >Subject: Re: VAXstation/MicroVAX 2000 CPU/FPU overheating? > From: "Dave Dunfield" <dave06a at dunfield.com> > Date: Sun, 02 Mar 2008 09:35:46 -0500 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >> > The extended system tests 101, 102 and 80000106 will not test the FPU >> > - this may be normal, I don't know. The docs say they will test all >> > hardware which is installed - this may mean that the FPU is not being >> > full detected... I don't know. >> >> Is the FPU socketed? If so, can you remove it, and what the boot and >> test output looks like? > >Aw, I wish ... the only things socketed on this board are the ROMs and >the serial device. The CPU/FPU are 68 pin surface mount devices. > > >> If you can't remove the FPU (likely), the diagnostics would probably be >> complaining about it not working... > >Which is the main reason I'm not 100% convinced the FPU is faulty. But I >can't get the extended disgnostics to test it, and I don't know how "good" >it has to be to pass the basic startup test. It doesnt other than not jamming the busses. VAX does nto need the FPU to boot. > >> I've not had my uV2000 opened up (or even turned on yet...), but that'd >> be my next step. >> >> Maybe if I have some time, I'll dig mine out and try playing with it. > >If you do open it up and have it to the point where you can scope signals, >please contact me ... I've got a few questions about the signals I see in >mine. I've also got a couple of questions about the diagnostics and the >FPU that could be answered with a running system (only the console ROM >required). > >If anyone has a running VS2000 or UV2000 and is willing to open it up to >help me do some comparison testing, here are the things I would most like >to know: I had mine open for temperature testing, thats were I got the 58C from. I should play with console boot later. >[For best results, it would be good if the system were configured to match >mine - all expansion boards, drives, peripherals etc. disconnected, and >the uVAX/VS jumper located about 3" directly behind the BNC ethernet connector >set to the uVAX position, which is AWAY from the BNC connector.] Sounds like mine more or less. I cant scope it at this time as the wide band scope is burried and likely not going to emerge for a while. I have a 20mhz dual trace for most work handy as it's smaller but it will not see a 40mhz clock well nor do I use it for that kind of work. Allison >[To run the extended diagnostics 101, 102 and 80000106 you need a DB-25-F >connector installed (on the DB-25-M connector on the board) with pins 12 >and 18 connected together] > >a) Whats tests are run by the "T 101" command? > Mine runs: C, B, 7, 6 > >b) If you run "T 80000106" and then enter '9' at the "? >>>" prompt, > do you get any test output other than the CPU designation title? > >[For the following, I would like a description of the waveforms > observed, waveshape, amplitude and frequency where appropriate] > >c) The 40Mhz clock at the W4 jumper (right beside the 40Mhz oscillator > "can") - with the jumper installed? > I see 40Mhz sine wave, about 2.3v p-p > >d) The 40Mhz clock at the W4 jumper pin closest to the oscillator > "can" with the jumper removed? > I see 40Mhz sine wave about 3.4v p-p > >e) Pins on FPU > 44 - I see about 160mv irregular square wave > 59 - Same as above > 15 - I see 40Mhz at about 160mv > >Dave > >-- >dave06a (at) Dave Dunfield >dunfield (dot) Firmware development services & tools: www.dunfield.com >com Collector of vintage computing equipment: > http://www.classiccmp.org/dunfield/index.html

18 years, 1 month

Obsolete chips

by jefferwin＠gmail.com

> > Message: 1 > Date: Sat, 01 Mar 2008 00:31:26 -0800 > From: "Chuck Guzis" <cclist at sydex.com> > Subject: Re: Source for TTL chips > To: "General Discussion: On-Topic and Off-Topic Posts" > <cctalk at classiccmp.org> > Message-ID: <47C8A3DE.23896.8B3FACB at cclist.sydex.com> > Content-Type: text/plain; charset=US-ASCII > > On 1 Mar 2008 at 1:35, Michael Lee wrote: > > > For small amounts I use Jameco Electronics... > > Where does one go to find the not-very-common TTL? e.g., the 7497 > rate multiplier; the 74199 8-bit register, etc. TI had some pretty > estoteric circuits also--74LS362, 74LS444, 74S485, 74S481... > > Cheers, > Chuck > > > I have the same issue. I need three obsolete chips from National Semi, DM 8131, DM 8836 and DM 8837. I have scoured the internet with no luck. I do have a board with these chips in it, I may have to resort to desoldering them. I just hate doing that, it tends to ruin the source board.

18 years, 1 month

board scan, design reconstruction (was IMSAI)

by lynchaj＠sbcglobal.net

> -----Original Message----- > From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org] > On Behalf Of Randy Dawson > Sent: Wednesday, February 27, 2008 2:20 PM > To: General Discussion: On-Topic Posts Only > Subject: board scan, design reconstruction (was IMSAI) > > > > > > Date: Wed, 27 Feb 2008 09:48:10 -0900 > > From: grant at stockly.com > > To: cctech at classiccmp.org > > Subject: Re: TTL CPU Re: IMSAI style C&K 7101 switches > > > > At 06:40 AM 2/26/2008, you wrote: > > >Grant, > > > > > > > On a side note, who here would be interested in ultra high [snip] > > > > Hi, > Ive been following this, and maybe I can help. Im a professional PCB > layout guy in my day job. With a schematic and a reasonable resolution > jpeg of both sides (I doubt there was mych multylayer back then) I could > reconstruct the design fairly quickly. Nobody is really going to want to > go down the road of taking a picture and turning it into a gerber, it just > wont work. Id just input the schematic, duplicate the ref des for all > parts, to get the netlist, eyeball the jpeg for placement and throw it at > the autorouter. > > Whats on your top 10 list? > > (S-100) > > CPU card > Dazzler > Byte Blaster > Async card > disk controller card > > I could knock those out in a week or two. > > Randy > > _________________________________________________________________ > Helping your favorite cause is as easy as instant messaging.?You IM, we > give. > http://im.live.com/Messenger/IM/Home/?source=text_hotmail_join [AJL>] Hi, All those S-100 boards definitely sound interesting but here is a twist for something I think would be highly useful for recovering data from vintage computers using generic PCs. How about a PCI floppy controller board? Maybe with some supplementary logic to allow raw track reads? Possibly a BIOS to boot from? An external floppy drive connector? Just wondering how complicated such a thing would be. Thanks! Andrew Lynch

18 years, 1 month

front panel display for a modern PC

by lynchaj＠yahoo.com

I'm curious why anyone would want a front panel with lights and switches. Except for some early IBM mainframe stuff, the number of systems that I've worked with that had no front panel vastly outnumber the ones that did. Indeed, the front panel on the MITS 8800 seemed to be a waste of good components and an anachronism at that. Better to take the costs of the panel and roll them into a good diagnostic ROM with loader. The S-100 followup machine that I used, an Integrand box, had only a reset button on the front panel. I never missed the switches. After the MITS box, I never owned another system with a blinkenlights-and- switches front panel. Just trying to understand. Cheers, Chuck -----REPLY----- Hi, I must have missed the whole "front panel on a microcomputer" thing too. I recall seeing microcomputers with front panels around but never owned one. It has always seemed to me a good boot ROM with monitor is the way to go. Vector Graphic did a good job with their Executive Monitor boot ROMs. I'd rather use a bus probe, logic probe, or VOM when I debug so it can be removed when the machine is finally working. That being said, I still think an IMSAI is a cool microcomputer and would love to get one some day. Thanks! Andrew Lynch

18 years, 1 month

VAXstation/MicroVAX 2000 CPU/FPU overheating?

by ajp166＠bellatlantic.net

> >Subject: Re: VAXstation/MicroVAX 2000 CPU/FPU overheating? > From: Patrick Finnegan <pat at computer-refuge.org> > Date: Sat, 01 Mar 2008 22:02:35 -0500 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >On Saturday 01 March 2008 21:11, Dave Dunfield wrote: >> The extended system tests 101, 102 and 80000106 will not test the FPU >> - this may be normal, I don't know. The docs say they will test all >> hardware which is installed - this may mean that the FPU is not being >> full detected... I don't know. > >Is the FPU socketed? If so, can you remove it, and what the boot and >test output looks like? It's soldered down and not removeable with out the right tools for handling high lead count surface mount. Me I'd pull a old MVII cpu card and do the remove and replace of the FPU and CPU. MicroVAXIIs with good cpus and FPU and bad Qbus interfaces are not uncommon. Allison >I've not had my uV2000 opened up (or even turned on yet...), but that'd >be my next step. > >If you can't remove the FPU (likely), the diagnostics would probably be >complaining about it not working... > >Maybe if I have some time, I'll dig mine out and try playing with it. > >Pat >-- >Purdue University ITAP/RCAC --- http://www.rcac.purdue.edu/ >The Computer Refuge --- http://computer-refuge.org

18 years, 1 month

Selectric trouble

by dj.taylor4＠verizon.net

At 09:46 PM 3/1/2008, you wrote: >I have a Selectic II that I use now and then. Similar problem. I packed a >few paper towels in there and sprayed a fair amount of good (not WD40) >lubricant (LPS brand if I recall), let it soak for an hour and than wiped >the insides out and removed the towels. It works great. > >This is not a restoration or preservation, but rather how I got a junk >selectric II that I got for free to work wonderfully. Got a new ribbon at >office depot too. If there was one thing I would like to do would be to >have the platen turned down to level out all the pocks from years of use. Do you remember what LPS lubricant you used? I have a 'Ham Fest' IBM Selectric and it sticks a little.

18 years, 1 month

Any word on OS/2 for PDP-11?

by tshoppa＠wmata.com

Dan Gahlinger wrote: > There *IS* a Vax named a "Saul" or "SOL", I've seen it. > It's a "luggable" (so to speak) like the Rainbow, but it's a Vax. > They existed, so don't insult my intelligence. > And btw I've been doing Vaxen since 1976, so I think > I know a thing or two about reading Ascii > it's definitely "OS/2" I think it's time for me to unsubscribe from this list and get back to reality. Sure, let's make up names for already existing products instead of figuring out what they are (VS2000? VAXmate?) and then insist that that we've been doing the VAX a year before it left the factory, therefore OS/2 has to exist for the PDP-11. Why do I even try to interject myself into this crap. Tim.

18 years, 1 month

HP 85 tapes / TU58 tapes

by Mick.Lindell＠ge.com

Greetings, Do you still have the TU58 tapes? Mick Lindell Sr. Test Development Engineer GE Aviation Digital Systems T +1 616 241-8454 E Mick.Lindell at ge.com 3290 Patterson Ave. SE Grand Rapids, MI 49512 USA GE imagination at work These commodities/technical data are controlled for export by the U.S. State Department. They may not be transferred, transshipped on a non-continuous voyage, or otherwise be disposed of outside of the United States, either in their original form or after being incorporated into other end-items, without prior written approval of the U.S. Department of State.

18 years, 1 month

On interfaces, paper tape readers/punches, and single (small) chip micros

by tsw-cc＠johana.com

As said before, one can easily get some of the small (8 pin dip) micros to do magic things, but sometimes (as mentioned) it is a bit more trouble than it is worth. Many of us (me!) have stuff in their junk boxes^H^H^H^H^H^H^H^H^H^Hclassic part archive that will do the task quite easily. In my case, I obtained a nice Facit 4070 paper tape punch and made up a simple interface adapter (it fit inside one of those 2x DB-25 scramble boxes) to make it function using a PeeCee parallel port. Now if I desire to punch a paper tape, all I do is a simple copy to the printer port and ...buzzzz... out comes the tape. Thankfully the Facit 4070 had some power available on its DB-25, but I needed to play around with all the levels (it used 6 volt levels). In the end, all it took was a single 74LS00 to do the trick on changing the strobes to conform. I suppose I could have used an 8 pin ATMEL chip, but why bother. Sometimes the "classic" solution is MUCH easier. I even built up a character font (5x8) so I could punch titles in the tape. Of course, now I need to get the reader functional, but that is another story. p.s. If anyone wants details on the interface, contact me off list. -- Sorry, No signature at the moment. ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ

18 years, 1 month

JDR ? Re: Source for TTL chips

by FJGJR1＠aol.com

Hi! I am jumping into this thread late, but has anyone checked JDR in CA? I see that they still have many of these 74xxx series chips. I am interested to tell people about them that buy the 6 Kaypro "8" 's [upgraded / modified Kaypro 4's 1983's] I will be selling on eBay in May / June. Prices are cheap - $0.25 up to a few dollars for Z80's etc. I even became a "commercial customer" with associated small discounts in the 1900's - not good for the bank account howerver!. Many of the others suppliers have gone out of business naturally from that era. I was pleasantly surprised they still supply these so inexpensively.. Just a thought in case it is useful and some did not know about JDR. Frank In a message dated 3/1/2008 8:33:00 P.M. Eastern Standard Time, rtellason at verizon.net writes: On Friday 29 February 2008 16:37, Grant Stockly wrote: > DigiKey or Unicorn Electronics. > > Both want $25 on the order or a handling fee applies. > > Grant > > At 09:03 AM 2/29/2008, you wrote: > >It used to be you could go to Radio Shack and pick up a couple of 74ls02 > >chips as needed. Now it seems there isn?t a source for someone who wants > > to purchase a handful of 74xx ttl chips. I must've missed this the first time around, or it's lower down in the stack... > > I have a ?brand new? s100 SIO card that is just missing the 14 logic chips > > to go in the sockets, but I am not finding a convenient source for them. > > > >Anyone know where I can go to find them in very small quantities? Have a look here: http://mysite.verizon.net/rtellason/w4s.html and use your browser's search function (usually ctrl-F) to find "TTL". That's only the stuff I have a lot of, I have somewhat lesser quantities of other numbers too. -- 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 **************Ideas to please picky eaters. Watch video on AOL Living. (http://living.aol.com/video/how-to-please-your-picky-eater/rachel-campos-du… 2050827?NCID=aolcmp00300000002598)

18 years, 1 month

Selectric trouble

by Watzman＠neo.rr.com

Re: On 3/1/08, Robert Ollerton <rollerton at gmail.com> wrote: > I have a Selectic II that I use now and then. Similar problem. I packed > a few paper towels in there and sprayed a fair amount of good (not WD40) > lubricant (LPS brand if I recall), let it soak for an hour and than wiped > the insides out and removed the towels. It works great. > When you did this, did you remove the platen? The upper shell? The lower shell?" **** It is VERY easy to remove the platen, and to remove the entire mechanism >from both the upper and lower case. It can be done in about 20 seconds.

18 years, 1 month

atc-510 simulator

by fwujek＠cox.net

Hi Joe, Was wondering if you ran across or have a Service Manual for the ATC-510??? Thank you, Fred H. Wujek

18 years, 1 month

front panel display for a modern PC

by slawmaster＠gmail.com

I'd really like to have something like one of the old mainframe/minicomputer control panels for my PC, but I'm just not sure how to implement it. Anybody here tried something like that? Ideally, you could power it on, see registers, toggle stuff into memory, have lights for interrupts, that kind of thing. Yeah, I know, as soon as I bring up an operating system, the ability to toggle things into memory would be rather dangerous, but I just can't resist the charm of the idea :) So... doable? Impossible? Improbable? John -- Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn

18 years, 1 month

More on my CDC (MPI) floppy drive

by ard＠p850ug1.demon.co.uk

Yo umay rememebr my recent posting aasking for information on the damper assembly on the head carriage of a full-height 5.25" MPI floppy drive. I've done a little more work on it. Firstly, it appears the damper ron was glued ot the head carriage. Since this makes it very hard to work on (fitting the tension abnd is difficult at the best of times!), I cleaned out the holes, and drilled (1.6mm) and tapped (M2) an extra hole in each of the plasic rackets that hold this rod, 0.2" away from the existikng hole. I then screwed little rass plates in place to keep the rod in. Secondly, I've assembled (but not aligned) the positioned. Fittlng the tensio band ais a pain, I now think that little O-ring I found on one of the pins is an assembly aid to keep the tension band on that pin when you're trying to fit the other end in place. I will order some more O-rings (the pins are 1.5mm diameter, BTW) and see how I get on. Thirdly, I've had the positioner running on a disk exerciser. WIth a 6ms step rate (which seems about right), it sounds _much_ rougher with the damer wheight not fitted. Even without any grease (other than that I've not managed to clean out) on the assembly, fitting the weight makes it a lot smoother. Fourthly, I _still_ can't see how the grease is kept in place, and why it doesn't just leak all over everthing. -tony

18 years, 1 month

Dekatron article

by ard＠p850ug1.demon.co.uk

For those who've not seen it yet... In this month's Elektor magazine (or at least in the UK edition of it), there's a 2-page 'Retrotronics' article giving a design for a Dekatron counter driving a nixie tube with 6J6 (ECC91) triodes as buffers. -tony

18 years, 1 month

HP-12531 C and D

by Tim＠Rikers.org

I have 4 HP-12531 cards. Two are have tabs labeled "HS TERMINAL" and 2 have labels "BUF'R'D TTY REG". Three of cards have 307.200 Khz crystals, and one of the non-HS boards has a 225.280 Khz crystal. >From what I read in: http://www.bitsavers.org/pdf/hp/21xx/interfaces/12531C.pdf and on: http://www.cs.ubc.ca/~hilpert/e/HP21xx/io12531BCD.html the only difference I can see between the C and the D is the crystal. Does anyone know of another difference? Ok, here's the big one. Anyone know where to get another 307.200 Khz crystal? :) -- Tim Riker - http://Rikers.org/ - TimR at Debian.org Embedded Linux Technologist - http://eLinux.org/ BZFlag maintainer - http://BZFlag.org/ - for fun!

18 years, 1 month

Selectric trouble

by Watzman＠neo.rr.com

I am not a selectric guru, but I have one and I think that the most likely cause is that the lubricant has dried out, isn't lubricating and in fact is acting like glue or adhesive. The "right" way to fix this is to have the whole mechanism immersed in a bath of solvent (quite a few things have to be disassembled and removed before this is done) to clean off the old lubricant, and then relubricated afterwards. This used to be common, but there are not many places now that still do it and it's expensive (probably a couple hundred dollars). I have a full IBM service manual for the Selectric II, which is virtually identical to your machine, but I only have it in hard copy, not PDF, and it's bound. Perhaps there is a PDF copy of this manual on the 'net somewhere. A guy who did the immersion cleaning used to advertise his service on E-Bay, you might to a search there, or a google search. Barry Watzman Watzman at neo.rr.com PS - Actually I found the contact information for someone who was still doing this at least in 2006. His name is Rich Wiley, he is at 800-552-8592 and his E-Bay ID was coyote0153.

18 years, 1 month

1st stage loader for IMSAI - need ascii to binary

by aliensrcooluk＠yahoo.co.uk

YouTube doesn't stream. It slowly downloads the flash video files to the temporary internet files folder where it's usually named "FlaXX.tmp". The XX is usually a hex number depending on how many tmp files you have in there. The file is also (99% of the time) deleted the second you close the page it is linked to. The good thing is that you can watch the video before it's fully downloaded. A very good thing if you are on dial-up :) Does anyone have a list of retro video's on YouTube? I know most can be found by searching for the appropriate machine name, but not everyone has decent tags with there videos :( Regards, Andrew B aliensrcooluk at yahoo.co.uk woodelf <bfranchuk at jetnet.ab.ca> wrote: Right now I am trying to VIEW the %$@! You-Tube stuff. I hate streaming stuf on dial up. I don't think I will ever get more than the 1st few minutes of the UNIVAC stuff. Nothing like comparing almost 60 years of computing development. > Cheers, > Chuck >

18 years, 1 month

VAXstation/MicroVAX 2000 CPU/FPU overheating?

by ajp166＠bellatlantic.net

The same CPU and FPU are sued on the KA630cpu (uVAXII) and in early microvax3100s so any of them should compare. Is it possible that someone has overclocked the that uV2000??? FYI: gate leakage would kill the chips not make it run hot. The usual reasons for hot running are: Over voltage! Overclock Undercool Excessive bus loads (capacitive or resistive) Since the machine is a closed system for the most part the first is most likely and the others are least likely. I may add that over 60C is way too hot at the heatsink and the die due to thermal resistance will be hotter. I'm trying to pull down one of my uV2ks and fire it up. Allison > >Subject: Re: VAXstation/MicroVAX 2000 CPU/FPU overheating? > From: "Dave Dunfield" <dave06a at dunfield.com> > Date: Fri, 29 Feb 2008 08:18:31 -0500 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >> I assume these CPU and FPU chips are MOS devices. Is it possile that >> excessive leakage across the gate oxide layer in some transsitors of that >> chip would cause it to run hot, but still work? I'm pretty sure I've seen >> chips that seem to work, but get hot and then stop working, althoguh >> cooling them with freezer spray keeps them running. And these were not >> chips driving high pwoer laods -- they were things like the clock/timer >> microcontroller in a VCR. > >Yes, I'm wondering if it's something like that, however how likely is it >that both devices would experience the same fairly-uncommon failure mode >at the same time? > >Perhaps I've been engaging in the persuit of an undomesticated ornithoid... > >Is it possible that the devices normally run this hot, and the failure is >occuring for another reason (possibly a side effect of the heat, as cooling >them does allow it to keep running). > >Allison said "they do run hot" - does anyone know how hot? > >I did some further tests last night - I dug out my thermocouple and made >some actual heat measurements with the system assembled, but with the color >frame buffer removed - there should be better airflow, and this appears to >be the case, since the machine did not die after 10 minites of operation. > >Ambient temp was measureing about 25 degrees C at the start of the test. >>From power on, the CPU and FPU rose rapidly (within 3-4 minites) to >the 70C range, then more slowly rose to temperatures of 76C for the CPU >and 82C for the FPU after 10 mins. At this temperature they seemed to be >getting stable - having done nearly 1-1/2 mins without an increase. It's >possible/likely that they would climb anothe few degrees in extended >operation. > >Once this temperature was reached, I held the system in RESET, and >observed that the temps dropped back after a few minites to about 64C >for the CPU and 68C for the FPU. > >To my mind, a processor running at 80C is damn hot - most of the embedded >devices I work with list absolute maximum running temperature as 70C or >75C - but perhaps the DEC devices are designed to run hotter - I note the >Intel 486 datasheet lists absolute maximum (under bias) as 110C ... > >Anyone on the list with a VS 2000 or uVAX 2000 that can do some temperature >measurements? > >Dave > >-- >dave06a (at) Dave Dunfield >dunfield (dot) Firmware development services & tools: www.dunfield.com >com Collector of vintage computing equipment: > http://www.classiccmp.org/dunfield/index.html

18 years, 1 month

Speaking of PPT (was: Re: Friden Flexowriter)

by roger.holmes＠microspot.co.uk

On 28 Feb, 2008, at 08:16, cctalk-request at classiccmp.org wrote: > > Message: 25 > Date: Wed, 27 Feb 2008 23:38:42 -0800 > From: "Chuck Guzis" <cclist at sydex.com> > Subject: Re: Speaking of PPT (was: Re: Friden Flexowriter) > To: "General Discussion: On-Topic and Off-Topic Posts" > <cctalk at classiccmp.org> > Message-ID: <47C5F482.14707.21D48412 at cclist.sydex.com> > Content-Type: text/plain; charset=US-ASCII > > On 28 Feb 2008 at 7:49, Jos Dreesen / Marian Capel wrote: > >> The latest HP papertape reader I sold on Ebay fetched all of 5 >> Euros...... > > I know that PPT readers can really zip right along, but what's the > fastest perforator ever made? Laser-driven, maybe? Catching up on old messages. The manuals for my ICT 1301 refer to the standard paper tape punch, and it ran at 300 characters per second and had a check reading station to verify every character punched before winding the tape onto a reel. Unfortunately I don't have one of them but my 1301 does still have one (of two) of the Elliott tape readers which runs at 1000 characters per second and which have a tape un-roller to prevent any drag on the reader itself. At 1000cps, the tape comes out almost horizontal from the reader and a bin has to be positioned correctly to catch it. Even at full speed, the reader can stop on character unlike the earlier Elliott tape readers, which was why when I worked for Marconi-Elliott Avionics, all text tapes were punched with four null characters after every line termination (ASCII CR-LF or Flexowriter newline). Binary tapes were expected to be read all in one go without stopping. My own Flexowriters have round military style Cannon plugs for I/O and use 110v signal levels designed for relay logic. A previous owner of my 1301 has grafted on a large Vero board full of discrete components, TTL and relays to drive one of the Flexowriters for output, and an old ICT keypunch keyboard for input as well as a smaller board to output to a Teletype BRPE (100 cps) paper tape punch. The non standard online Flexowriter and keyboard are currently disconnected and I control the 1301 the same way as 99% of 1301s were controlled via the control panel, which is, I estimate, 4 feet wide by 2.5 feet high. Most programs are small and I key them in through the front panel as I can't find anyone to repair my IBM keypunch.

18 years, 1 month

WaveMate Bullet

by lynchaj＠yahoo.com

Hi All, Thanks to some very generous help from a few friends, I have been able to finally locate a boot disk for the WaveMate Bullet. In addition, I was able to repair the unit and now it boots and seems to be working at least to some degree. Along the way, I gathered up a lot of disk images, documentation, files, and assorted other items related to the WaveMate Bullet. As this is a rather unusual vintage computer I am considering storing this cache of stuff online someplace to help any other prospective WaveMate Bullet owners. My first reaction is to start another Yahoo! Group but I know a lot of people here absolutely hate those so I thought I'd poll the list to see if anyone could suggest a more palatable alternative. My requirements are simple; just a small amount of file storage, a simple web interface, and a mailing list. Thanks! Andrew Lynch

18 years, 1 month

SGI A/V Module question

by Arno_1983＠gmx.de

"Zane H. Healy" <healyzh at aracnet.com> wrote: > It sounds like you have the audio only A/V modules. This is what I have > in both of my SGI O2's. :^( Hmm, the video connectors and all the major components are in place, and the board has the number 030-0728-004 on it - Gerhard Lenerz's SGIstuff page says this is an O2 Audio/Video Board (Audio only module would be 030-1145-XXX). Hinv however only detects the board as "Audio: A3 version 1" so the video circuitry must have been disabled somehow. Perhaps there's something to be done about it: There are a few open resistor lands next to the edge connector (R503, R504, R505; R510, R511, R513, R514) and along the lower edge of the board (R556, R557, R558; R569, R573, R575, R576; R587, R593) and three SMD inductors (L512, L513, L514) missing on the solder side. So long, Arno Kletzander -- Arno Kletzander Student Assistant // Studentische Hilfskraft Informatik Sammlung Erlangen www.iser.uni-erlangen.de Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! Ideal f?r Modem und ISDN: http://www.gmx.net/de/go/smartsurfer

18 years, 1 month

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