- test-drb@ccmp.vtda.org - classiccmp.org

by g-wright＠att.net

Any interest in this before it gets scrapped. Missing the drives and Drive holders. rest looks Good. Full Model number T-16 7168 Name CLX cyclone-R vintage 1991 or so - Jerry

15 years, 5 months

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OT: american vs european 220 (Tony Duell)

by jonas＠otter.se

> > It's in the second version of the book that I have. The book also > includes the 5-10, 5-20, 3-3, several preamplifers and tape > recording/playback amplifiers. It doesn't include an FM tuner design. The > older book ('High Quality Sound Reproduction') includes the 5-10, 5-20, > their preamps and an FM tuner. The latter was removed from the later book > because apparently few home constructors could align it properly. > > -tony > That's the one I have. Published 1959. Seven-watt DC/AC Amplifier, pages 59-66, UF86, 2xUCL82, UY85. I had no idea there was another version with an FM tuner in. I wonder how I could get hold of one? Jonas

15 years, 5 months

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CP/M based Digitech network analyzer available

by allanh-cctalk2＠kallisti.com

Jason T wrote: > While I am by no means Mr. CP/M, I have never seen a CP/M machine with > a 3.5" floppy before. > > Who can name any others? BNW System 1. Okay, there was only one of those so it's not surprising you haven't seen one. It was dual processor, Z80 and 68000; it ran CP/M 3 on the Z80 and both CP/M and UCSD p-system on the 68K. It used the high RPM Sony 3.5" drives (600RPM?); those used the same data rate as a standard 8" floppy, so the controller could run both 8" and 3.5" without having to switch any clocking. allan -- Allan N. Hessenflow allanh at kallisti.com

15 years, 5 months

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trs 80 model I "i/o bus interface adapter"

by billdeg＠degnanco.com

Does anyone have a TRS 80 Model 1 with Expansion Interface and external hard drive? According to a 3rd party hard drive manufacturer (VRDATA Hard Disk III) there is a small device called the trs 80 model I "i/o bus interface adapter" that goes between the EI and the hard drive. Any clues about this? Bill

15 years, 5 months

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HP 7240A plotter paper substitute?

by derschjo＠mail.msu.edu

I seem to have a plotter-based theme going here today... Snagged an HP 7240A (this is the RS-232 version of the 7245A) plotter today, it's in working condition. A really cool design -- a combination plotter/printer using a thermal print head. My understanding is that the special tractor-feed thermal paper for this thing is basically impossible to find. Anyone out there found a reasonable substitute? Mine came with maybe 1/4 of a roll left in it, and I guess after that's gone I'll probably never get to use it again :). Thanks, Josh

15 years, 5 months

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OT: american vs european 220 (Tony Duell)

by jonas＠otter.se

> >That might explain the 'optional' conactor and multi-phase wiring on our >wanhing machine wiring diagram. Did I metion it's a Swedish machine... > If it's a Cylinda, it might actually be made in Sweden. If it's an Electrolux, it could be made just about anywhere. Electrolux own 50 brands or thereabouts, and I believe they make appliances in several countries in Eastern Europe as well as in Italy (Zanussi is Electrolux since ages, as well as the AEG appliances division). On the subject of power sockets in bathrooms, in Sweden sockets may be fitted in bathrooms provided they are either earthed and protected by a Ground Fault Interrupter (there is probably a requirement that the GFI be located outside the bathroom), or have an isolating step-down transfomer internally, 220/110 and about 20 VA or so. Houses built after 1994 may not have non-earthed sockets anywhere. My bathroom has a small laundry section which I am intending to use as a darkroom. My flat is from 1963 so there is no socket in there, I have bought a portable GFI and intend to run an earthed extension lead from the kitchen via the GFI into the bathroom whenever I want to use it as a darkroom. Probably illegal but it should protect me (I hope...). Jonas

15 years, 5 months

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OT: american vs european 220 (Tony Duell)

by jonas＠otter.se

> No, it;s an Asko, from the time before they were taken over. > That would be Finnish then IIRC. Cylinda is Asko Cylinda since a number of years. We used to pass the Cylinda factory every time we went to see my ex-parents-in-law. It's in a little village called Jung, in the South-west of Sweden. Cylinda used to be known for being particularly high quality since the washer drums were made of stainless steel where everyone else used mild steel. Asko Cylinda was bought by Gorenje of Slovenia last year. > > On the subject of power sockets in bathrooms, in Sweden sockets may be > > fitted in bathrooms provided they are either earthed and protected by a > > Ground Fault Interrupter (there is probably a requirement that the GFI > > be located outside the bathroom), or have an isolating step-down > > transfomer internally, 220/110 and about 20 VA or so. Houses built after > > The latter sounds like hte 'shaver sockets' we get in the UK. As I > mentioned, I bought a few in a pound shop and extractd the transformers > form them -- 110-0-110V at 20VA will power some small valve projects and > I've yet to find any other new HT transformers for a pound each :-) > They are meant for shavers and usually marked as such. The advantage of having earthed sockets nowadays is of course that you can run hair dryers in the bathroom (or even use the bathroom as a darkroom, which is presumably not what those who wrote the rules had in mind). > > 1994 may not have non-earthed sockets anywhere. > > I have no idea what the regualtions ontaht are over here. Virtually every > new installation (since about 1948) uses the 'ring main' with 3 pin > (earthed) sockets and plugs with intenral cartridge fuses. > > I think the only non-earthed sockets you would find now are isolated > shaver sockets. > I have always thought that the UK system was much more sensible. Not only are all plugs and sockets earthed, fused and switched, but they are also polarised so it is impossible to switch live and neutral (provided the electrician who installed them knew what he was doing). The Swedish plugs sockets are the same as the German ones, which are symmetrical and neither switched nor fused. > > > > My bathroom has a small laundry section which I am intending to use as a > > darkroom. My flat is from 1963 so there is no socket in there, I have > > bought a portable GFI and intend to run an earthed extension lead from > > the kitchen via the GFI into the bathroom whenever I want to use it as a > > darkroom. Probably illegal but it should protect me (I hope...). > > I would have to check the rgualtions, but in a darkroom you are working > in poor light with electricla stuff and water. No way would I want to do > without n RCD. > Precisely why i bought the RCD/GFI. I know for a fact I am going to die but I don't intend to bring it about by electrocution in the bathroom. And of course the RCD goes on the end of the lead outside the bathroom. I would want one even in a dedicated darkroom. Jonas

15 years, 5 months

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OT: american vs european 220

by CCTECH＠beyondthepale.ie

> >> On electronic (i.e. personal computer) gear, I wonder if the role of >> the ever-present ground wire isn't more for RF noise than actual >> safety protection. > >Possibly. Althoguh a lot of computer equipment is metal-cased and >certainly wouldn't meet the requirements for double insulation. One >consern would be the mains filter. With no ground wire the casing would >flaot at half mains voltage due to a capacitive voltage divider formed >from the capacitors from the power-carrying wires to the case. Yes, the >source impedance would be quite high, but enough to give you a tingle. >Worse than that, if you connect the machine ta an earthed device and if >the logic ground wire is defective you are most likely to end up zapping >driver and receiver ICs. This was, I am told, a problem with some Acorn >Econet installations... > It's happened to me :-( I have a Vaxstation 3100 which was equipped with an SPX graphics adapter which was plugged into a very nice VR297 monitor (Sony Trinitron). I plugged out the monitor cable from the back of the Vaxstation for some reason. When I plugged it back in I felt a zap. On investigating, the earth pin in the IEC plug going into the monitor didn't seem to be making proper contact for some reason. The monitor didn't mind a bit but one of the primary colour outputs from the SPX adapter went away (red I think). I traced the connections on the graphics card and found the RGB outputs came directly out of a large, probably expensive, difficult to replace and rare looking BT459 RAMDAC :-( That was the only serious problem I ever had with them but I never liked IEC plugs and sockets much. Even when they are correctly mated, they often seem loose. I suppose on the plus side, they are more likely to pull free than cause damage when I trip over a mains lead... Regards, Peter Coghlan.

15 years, 5 months

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VT330 Flyback Transformer Repair - advice please

by mark＠wickensonline.co.uk

Hi guys, I've received a replacement flyback transformer for the VT330. I'd like some advice about what other components it would be worth replacing at the same time. The transformer suffered from arcing but there doesn't appear to be any physical damage to any other components. I've got a replacement output transistor on the list, could anyone advise as to what else would be worth replacing - I'd like to get the terminal back to working condition with the best chance of a few years more use? My gut feeling is to also look at diodes and high voltage capacitors on the output side of the transformer, as well as the two large electrolytics on the input side of the power supply. I'm presuming that resistors don't normally need replacing. I have to weigh up the benefit of replacing components with the possibility that I don't get an exact replacement and balls something up. There are several high voltage (1000V+) capacitors are polypropylene. Do these typically stay stable over time? I have a circuit diagram and could put together an exact schematic if that is useful in helping. Thanks for the advice, Mark.

15 years, 5 months

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Mac 400K issue solved!

by curt＠atarimuseum.com

Hi, Okay, found a treasure trove of files buried deep on Apple's website: http://download.info.apple.com/Apple_Support_Area/Apple_Software_Updates/En… Found Diskcopy 4.2 from 1991... I installed it, it took 3 passes to read in the Corvus User Disk, but finally I got a good copy and then put in a fresh diskette, make the copy and it promptly mounting on the Mac desktop and I was able to open it and all of the files were right there, so that worked like a charm. So to review: Powermac 5260/100 Mac OS 7.5.3 Diskcopy 4.2 This all worked well in finally reading the older 84-85 Mac MFS diskettes... So I just updated the Macintosh Archive section with the added Mac User Client for Corvus Omninet networks (this will not work with Appletalk or Ethernet, you need a special Corvus Interface Adapter that plugs into the Localtalk Port and then to Corvus Omninet cabling...) http://www.corvusmuseum.com/software/mac/ Curt

15 years, 5 months

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Free (in Seattle): HP 7550A Plotter

by derschjo＠mail.msu.edu

This is an 8-pen 8.5"x11" autofeed plotter with Serial and HP-IB interfaces. It's in good shape, and seems to be almost working, but something's gone awry with the autofeed mechanism -- it's not picking up paper from the tray. Some of the pens still have wet ink in them :). A friend of mine was tossing this out and I couldn't let that happen, but since I already *have* a working 7550A I probably don't need another. Anyone interested? This is in Seattle, drop me a line... - Josh

15 years, 5 months

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Need RL02 Controller for PDP-11/44 Restoration

by michael.99.thompson＠gmail.com

> So I'm *almost* sure that you can run one without the OCP. Mind you, it > might have been an RA71 or RA72 rather than an RA70. > > Right now I cannot put my finger on a suitable manual ... > > There are, I'm sure, some jumpers or switches that set the unit number. There is a DIP switch on the back next to the Fault and Ready LEDs that is labeled Unit Number Select. Next to the DIP switch is a pushbutton labeled Unit Number Accept. I have all of the DIP switches off, I suspect for Unit Number 0. I tried pushing the Unit Number Select push button both after the drive was powered up and while it was being powered up. It does not spinup. > Antonio > arcarlini at iee.org -- Michael Thompson

15 years, 5 months

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Kinda off topic: searching for a PC server power supply

by jrasite＠eoni.com

You folks are the best people I know for scaring up obsolete hardware. <smile> My employer needs a power supply for an Acer Altos G510 server. He has contacted all his sources and come up empty. He says, "I really need one." Specifically, we need: STANDARD POWER SUPPLY 450W DELTA/ DPS-450DBM). Acer Part Numbers PY.45005.002 Any leads would be really appreciated. Google gets exactly four hits. <sigh> Please reply p-mail. Thanks, Jim Arnott Support Services Eastern Oregon Net, Inc. La Grande, OR

15 years, 5 months

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Tektronix 4010/4014 terminal printer project

by tshoppa＠wmata.com

>> For the vector purists (e.g. me) making SVG or Postscript or PDF or some >> True vector format, would be a desirable goal. But with endpoint resolution >> Only 1024x768 probably overkill. I still hate seeing what I know are >> True vector lines, get rasterized. > Actually, IIRC, the 4631 is raster, not a vector device, It scans an > electro beam across the storage target in the (vecotr display) CRT and > reads out what's stored. And IIRC it does it a scan line at a time and > prints the image using a strange, flat, 1-axis CRT onto photosensitive > paper with the other axis being achieved by the paper movement. I was using a 4631 as late as 1990 to do "real work". (OK, it was academic, but real.) Somebody in office supplies knew somebody in procurement who could get me as much of The silver paper as I wanted. Anyway, even though the 4631 was a raster device in scanning, it still managed To avoid the jaggies that most pixellated devices suffer from. I note that the Decent PDF and SVG viewers manage to smooth over much of the jagginess. Tim.

15 years, 5 months

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Need RL02 Controller for PDP-11/44 Restoration

by michael.99.thompson＠gmail.com

>> Anyone have a manual for this drive or know how to get it work without >> connecting an OCP? > > How complex is the OCP? Is it possible to fake it? > > -tony It is actually fairly simple. It has a bunch of LEDs and START/STOP and WRITE PROTECT switches. It also has a connection to the processor for the RUN LED and the HALT switch. I tried just the OCP without connecting the cable to the processor and the drive will not spin up. There must be just a little logic on the board. I suspect that just adding a START jumper to the OCP connector on the drive will get it to spin up. I just need to figure out which pins. > Browsing the link you attached reminds me of one problem I came across > some time ago... > The drive seems to complain about the missing speed signal. > How is the speed signal generated? > Is there still an opto coupler under the drive assembly detecting the > sector impulses from a crown like mechanic coupled with the spindle? > > It is perhaps worth to check the LED / photo transistor for dust. > When done verify that a proper signal is generated and transmitted to > the disk controller assembly. > > Hope it will help, please keep us updated about your progress. > > Bernhard Wulf I will pull the HDA and look at the encoder next weekend. >> I pulled two RA70 disks from a pair of VAX-3500s that I have. By some >> miracle both drives spin up and go ready when the Operator Control >> Panel is connected. I was thinking that one of these drives would work >> nicely with the UDA50 disk controller in the 11/44 until I can get the >> RA81s sorted out. >> >> These drives are supposed to work with the Operator Control Panel. >> There is a button on the back of the drive that says Unit Number >> Accept. I pushed the button both before and after power up, but the >> RA70 does not spin up. >> >> Anyone have a manual for this drive or know how to get it work without >> connecting an OCP? > > I have used RA7x drives with a KDA50 (M7164 / M7165) without an OCP > attached to the drives. ?It has been a while now. ?I don't remember > there being anything tricky about getting it to work. ?I was probably > using either an RA72 or RA73. ?I'll have to look and see if I have an > RA70 to try. > > I don't remember if I ever found any RA7x drive manuals other than > this one on the net, which doesn't have all that much useful > information: > RA7x/SA7x Pocket Reference Guide, Order Number EK-RSA7X-PG-002 > > -Glen I have Googled for the User's Manual, but have not found anything yet. Thanks for all of the suggestions! UPS delivered the RL02 controller today. We have LOTS of RL01 and RL02 drives to try. We have XXDP on an RL01 that might make diagnosing the RA81s a little easier. -- Michael Thompson

15 years, 5 months

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OT: american vs european 220 (Tony Duell)

by jonas＠otter.se

> >Yes, exactly. The domestic mains is nomianlly 230V now. We get a single >phase wire and a neurtal, the latter being close to ground. Everything is >designed to run off that 230V supply. There is no 'centre tap'. So our >cookers, say, have 230V elements and a timer that runs off 230V mains. > >Actually, the European mains is 3 phase. The final transformer secondary >is start (wye?) connected with the star point being th eneautral. Houses >get a single phase supply consisting of that neurral wire and one of the >phase wires -- to balance the load, neighbouring hosues in a road get >different phases [1]. Of coruse industral places get the full 2 phase >mains to run larger motors, etc. It's very difficult to convince the >electricity companies to run 3 phase mains into a normal house, though, >which is a problem for people who ant to run large disk drives ;-) > >[1] In the cases of blocks of flats, student halls of residence, etc, >it's not unheard-of for each floor to be wired to wired to a different >phase. This has led to studend running extension leads to the rooms above >and below theres so as to get a 3 phase supply... > That's sad. In Sweden houses (almost?) always have 3-phase mains (230/400V), and flats get single phase. A very large proportion of Swedish houses have electric heating, run off 3-phase. A house will have at least 16A, sometimes 25A meter fuses; Sweden is quite cold in winter. Running 3 phase into a normal house is standard. The water heater will be 3 phase, usually the kitchen stove as well, and washing machines and tumble dryers can be connected either single phase or 2, sometimes 3 phase. The lighting and power points will be distributed evenly between the three phases (obviously). Although my flat does seem to have 3 phase. I shall have to check, I only moved in 3 months ago... Jonas

15 years, 5 months

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OT: american vs european 220 (Tony Duell)

by jonas＠otter.se

>> Weren't there also some European countries (or parts thereof) that >> used various DC voltages for lighting and small appliances? (Belgium >> or Italy?). > >We had DC mains in England into the 1950s in some areas. A lot of radios Gothenburg, Sweden had 127 VDC in some parts of the town in the late 60s/early 70s, even though almost all of Sweden had 220/380 3-phase since ages. >and TVs weew 'AC/DC',not just to save the cost of the mains transformer. >I rememebr working on TVs (long after the 1950s, of coruse) with >different voltage selector settings for AC and DC mains (possibly due to >fact that the smoothing capacitor would charge to the peak and not the >RMS votlage of AC mains). One of the Mullard books of audio amplfiier >cirucits (including things like the 5-10 and 5-20) includes a circuit >for an amplifier (4 valves, something like UF86, 2 * UCL82, UY85) for >AC/DC mains. Of coruse it was hot-chassis which is a right pain... > Hmm, I shall have to have a look at my Mullard book. I seem to remember that one. Jonas

15 years, 5 months

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OT: step down voltage converters

by brianlanning＠gmail.com

Can anyone recommend a good step-down voltage converter? I'd like to be able to plug 110 power tools into 220 european style outlets. Some of the power tools are 1.5hp induction motors, while others have the typical universal motors. I'll need a high-wattage unit. At least 2000watts I think, whatever is the maximum for a 20amp 110 outlet. Amazon has one for something like $85. But I'd happily pay twice that or more for one built like a tank with high quality components. Can anyone suggest one? brian

15 years, 5 months

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Vintage TTL computer

by tshoppa＠wmata.com

Nick writes: > Anyone have any interest in purchasing this minicomputer (believe it is > a Texas Instrument from 1972 used in manufacturing). It is missing the > core memory box however. I have a friend who is thinking of selling it, > I had no interest as it was missing the core memory, but maybe someone > here will want it? > http://lh4.ggpht.com/_lkddKjPsPFU/TUswHtRykbI/AAAAAAAAB6k/1ne8IFziAUU/s640/… Wow... where does this machine fall relative to say the TI-960A or 960B? I'm guessing that each of those little cards is one or maybe two bits of ALU/register slice. The TI-960's I've seen (maybe they were "A"'s and "B"'s and not the earlier pre-A) were working at a slightly higher level of integration with moderately bigger PCB's. Tim.

15 years, 5 months

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Vintage TTL computer

by nick.allen＠comcast.net

Anyone have any interest in purchasing this minicomputer (believe it is a Texas Instrument from 1972 used in manufacturing). It is missing the core memory box however. I have a friend who is thinking of selling it, I had no interest as it was missing the core memory, but maybe someone here will want it? http://lh4.ggpht.com/_lkddKjPsPFU/TUswHtRykbI/AAAAAAAAB6k/1ne8IFziAUU/s640/…

15 years, 5 months

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OT: PC Virtualization Software

by feldman.r＠comcast.net

Some months ago there was a thread about setting up virtual machines on an Intel PC, where people recommended different software. I cannot locate that thread in the list archives, so I am asking once more for recommendations on virtualization software that people have found to be good. What I want to do is run multiple virtual Windows XP or Windows 7 (64-bit preferred) machines on a single Intel-based PC. TIA, Bob Feldman

15 years, 5 months

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Visual 1050 systems for sale in Orange, CA

by d_cymbal＠hotmail.com

Disclaimer: Not my listing and I don't know the seller.? I was a little skeptical (10 systems?) and the asking price is not realistic. http://www.pennysaverusa.com/classifieds/merchandise/computers-printers/com…

15 years, 5 months

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AVL road Runner computer

by stevenm＠optonline.net

Joe, Do you still want to know about the Road Runner? I came across your slightly old post today. Steve AVL road Runner computer Joe rigdonj at cfl.rr.com Tue Nov 4 15:22:13 CST 2003 a.. Previous message: Kaypro 2X starts up with silly display b.. Next message: Anybody know what this HP test board is for? c.. Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] -------------------------------------------------------------------------------- Last week I found an interesting looking computer in a scrap place. It was called a Road Runner and was made by AVL. I wasn't familar with it so I posted a question here on the CC list about it and no one knew exactly what it was but a number of people contacted me about it and wanted to see some pictures of it. Yesterday I went back and and bought it. I brought home and today I cleaned it up and took some photos. First, the system was made by Audio Visual Labs of Atlantic Highlands, NJ. Second, I ended up with TWO monitors, TWO floppy drives and a detachable keyboard even though the unit has a built in keyboard. After I bought the thing but before I left, I was looking around and found a bigger computer marked AVL Eagle (I THINK Eagle was the name on it). I opened it up and it looked like an S-100 chassis. It had 9 slots with 8 boards in it. Two boards had 8080 CPUs, three boards had Intersil 6204s (communications boards? and three boards had 2114 memory ICs on them. All the boards including the backplane were made by AVL. I'd already paid for my stuff and I didn't think this one was all that interesting so I left it behind. But my point is that I think I ened up with the keyboard, monitor and floppy drive from the second AVL system as well as those for the AVL Road Runner. Anyway here's the links to the pictures. The Road Runner computer <http://www.classiccmp.org/hp/avl3/avl-rr.jpg> and the back of it; <http://www.classiccmp.org/hp/avl3/avlrr-b.jpg>. Note the connector on the left that connects to the expansion box. Picture of the expansion box, front and rear; <http://www.classiccmp.org/hp/avl3/avlexp-b.jpg> and <http://www.classiccmp.org/hp/avl3/avl-exp.jpg>. Note the the floppy drive attachs to the expansion box and it appears that only one floppy drive can be used on the compter. Small VM-5 (5 inch?) monitor, front and back; <http://www.classiccmp.org/hp/avl2/vm5.jpg> and <http://www.classiccmp.org/hp/avl2/vm5-b.jpg>. Large VM-9 (9 inch?) monitor, front and back; <http://www.classiccmp.org/hp/avl3/avl-vm9.jpg> and <http://www.classiccmp.org/hp/avl3/mon-b.jpg>. The external keyboard; <http://www.classiccmp.org/hp/avl3/avl-kb.jpg>. The two floppy drives; <http://www.classiccmp.org/hp/avl2/fd1.jpg> and <http://www.classiccmp.org/hp/avl2/fd1-b.jpg>. I don't know which drive goes with which system but I don't thinkit matters since the drives appear to be very similar despite the cables coming out at different points in the box and the drives being painted different colors. Both drives are marked FD-1. It's not made by AVL but this patch panel was in the box with the AVL stuff.<http://www.classiccmp.org/hp/avl1/patch.jpg>. From the markings on it, I'd say that it was used with the Road Runner. OK that's it. Can anyone tell me any more about it? Joe -------------------------------------------------------------------------------- a.. Previous message: Kaypro 2X starts up with silly display b.. Next message: Anybody know what this HP test board is for? c.. Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] -------------------------------------------------------------------------------- More information about the cctech mailing list

15 years, 5 months

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ADM3A Screen Rot

by trebor77＠execpc.com

I Have Three ADM3A's that sat in my Barn for Years. The Field mice made there home in two of them. One of those has a bad motherboard that might not be salvagable [Mouse Crap all over it] though I might soak it in warm water come Spring then blow dry and treat with 90% Isoprpyl alcohol but there is bound to be some Corrosion. One is still in the Barn but I plan on bringing it in when it gets WARM and see if I can SWAP the Top W/the CRT onto the one Unit that has a partially working M/B. It lights up my Breakout Box but Shows no Cursor but the tube Dies down to a Spot in the Middle when Turned off. I tried the one from the Bad M/B and it just Buzzed. If anyone is interested in the CRT's let me Know. If I can't get one working I can get something for the Aluminum Casings. But Maybe someone can use the CRT's. They look OK to me but I'm not familiar with SCREEN ROT. Shipping the whole Unit would be just to expensive. Maybe the One M/B is still useable???? Bob in Wisconsin

15 years, 5 months

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Computer test equipment... Boardwalker 101/103

by pinball＠telus.net

Does anyone here use electronic test gear for repairing these old machines? I am trying to hunt down information (manuals, schematics, ROM images) on a device made by Micro Circuits called Boardwalker - models 101 or 103. The group of techs I keep up with have tracked down a few sets of ROM images (up to V2.50, Library V1.60), but no one has found a manual - so far. The device is handy in that it can test TTL and Eproms (up to 24 pin devices) in circuit by comparison to the built in library and it appears that you can add to the library too... Thanks! John :-#)# PS - if anyone is interested in electronic service tools I've included the link to the tech tools mail list & FTP site below -- How to subscribe or unsubscribe from TTL: http://seven.pairlist.net/mailman/listinfo/techtoolslist FTP site is: ftp://ftp.flippers.com/TTL/TestEquipment Archive: http://www.vectorlist.org/

15 years, 5 months

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ENIAC ....

by evan＠snarc.net

Hi all -- Obviously no one here "collects" the ENIAC, but it's certainly old enough to be on-topic. :) Having said that, here is a new site devoted to ENIAC -- www.the-eniac.com -- the six orange links up top are packed solid with useful information. Disclosure: it's NOT my site, but I was involved in its creation.

15 years, 5 months

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OT: american vs european 220

by john_finigan＠yahoo.com

Chuck Guzis wrote: > Another artifact of earlier days in US industrial applications is > 55/110/220/440V 25 Hz distribution. The power transformers are huge > and the "hum" is more of a "rattle". Here in New Orleans, I am pretty sure that we still have 25 Hz drainage pumps in service, generated by a dedicated natural gas plant. Some of them may have been destroyed in Katrina, but searching around, I found some post-2005 news articles referencing the system. Apparently it relies on 60 Hz power for natural gas pumps, so it's still dependent on the local utility. The pumps seem to date back to 1920 or so. I don't know if the NYC subway system still uses any 25 Hz power or not. According to the book "New York's Forgotten Substations" they still had a few 25 Hz to DC synchronous rotary converters in operation as late as 1999! It would be unsurprising if they kept some of the 25 Hz system in place, feeding solid state rectifiers, but I don't know if they did. The power plant in Mechanicville, NY apparently still uses motor generator sets to convert its 40 Hz power to 60 Hz power they can sell. The plant is mentioned in a couple of IEEE articles, just search Mechanicville 40 Hz. Personally I think this is more amazing than our 25 Hz pumps. John Finigan

15 years, 5 months

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Because it's there: 5 operating systems running on a IIfx (at the same time)

by derschjo＠mail.msu.edu

A random thought popped into my head this evening, and having nothing better to do (well, ok, I have quite a few things better to do to be honest) I decided to go with the impulse. The idea? I have a number of nubus Mac coprocessors and accelerators, amongst them: - An Orange386 PC coprocessor (16Mhz 80386, 4MB ram, CGA graphics) - A Radius Rocket Stage II (Basically a Quadra on a 12" nubus card, complete with 40Mhz CPU and 32mb of RAM) - A Symbolics MacIvory III (The coolest coprocessor ever -- a lisp machine on a card!) Could I run these all at the same time in my trusty Macintosh IIfx? The answer: Yes. (warning, 1600x1200 image): http://yahozna.dyndns.org/scratch/random/5OS.png That's a 40Mhz 68030 IIfx running System 7.6.1, the Radius Rocket running System 7.1, the Orange386 running DOS 5.0, the MacIvory running Genera 8.3, and just for good measure the IIfx is also running Tenon's MachTEN (BSD 4.3 running as a Mac OS process). I didn't leave it running like that for very long, as it's probably more than a bit stressful on the poor IIfx's power supply. But I just had to try it, thought you guys might get a kick out of it... - Josh

15 years, 5 months

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7
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XT-IDE PCBs have arrived

by lynchaj＠yahoo.com

Hi! The next batch of XT-IDE PCBs have arrived! If you were waiting please contact me at LYNCHAJ at YAHOO.COM http://wiki.vintage-computer.com/index.php/XTIDE_project Thanks and have a nice day! Andrew Lynch

15 years, 5 months

1
0
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OT: american vs european 220

by dm561＠torfree.net

> Date: Tue, 1 Feb 2011 12:22:11 +0100 (CET) > From: Christian Corti <cc at informatik.uni-stuttgart.de> > Subject: Re: OT: american vs european 220 > To: "General Discussion: On-Topic and Off-Topic Posts" > <cctalk at classiccmp.org> > Message-ID: <alpine.DEB.2.00.1102011217160.10259 at linuxserv.home> > Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed > > On Mon, 31 Jan 2011, Tony Duell wrote: >> Taht wouldn't work in Europe (since the 2 sides of the 230V mains are not >> balanced about ground), and anyway AFAIK making the protecive ground wire >> carry any current under normal conditions is totally forbidden. > > In new installations, maybe. But many older houses have just that, they > use the neutral wire as protective ground (called "klassische Nullung" or > TN-C system as opposed to a TN-C-S system, see > http://en.wikipedia.org/wiki/Earthing_system) > > Christian ---------------------------------------------------------------------------------- And in some places they still have the single wire distribution systems where the 'real' earth/ground is the return: http://en.wikipedia.org/wiki/Single-wire_earth_return

15 years, 5 months

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CDC/MPI Wren II HH (94205-51) drive manual

by dm561＠torfree.net

---------------Original Message: Date: Mon, 24 Jan 2011 11:39:41 -0800 From: "Chuck Guzis" <cclist at sydex.com> Subject: Re: CDC/MPI Wren II HH (94205-51) drive manual To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Message-ID: <4D3D64FD.13298.6DC0FC at cclist.sydex.com> Content-Type: text/plain; charset=US-ASCII On 24 Jan 2011 at 10:09, Chuck Guzis wrote: > I have a Wren II manual, but not sure about the interface. I'll check > later today. I'll be darned--I found it. 77738035, Rev. H, April 1986. "This OEM Manual 77738035 provides the basic information and instructions for installing and operating Control Data WREN II Disk Drives; Models 94151, 94155 and 94156. It also provides information to aid in servicing those parts of the drive external to the sealed enclosure." Do you want me to scan and forward the whole thing to you? It's not terribly long, only about 40 pages. Or was there something specific that you were interested in? --Chuck -------------------Reply: I've got the Product Specification Manual (77715909-C, May/85, 61pp) for that CDC506 (ST506) 94155 series (and an opened drive as a piece of "art" beside my desk), but those are FH drives so I don't know how relevant it'd be.

15 years, 5 months

6
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VT240A vs. VT240B

by legalize＠xmission.com

What's the difference? -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://legalizeadulthood.wordpress.com/the-direct3d-graphics-pipeline/> Legalize Adulthood! <http://legalizeadulthood.wordpress.com>

15 years, 5 months

10
17
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ADM3a screen rot again...

by jdr_use＠bluewin.ch

Had another ADM3a come in, again with severe screen rot. Unlike the first time i now have successfully separated the faceplate from the CRT. Question is of course how to get it back on again. Anybody successfully done this ? I know screenrot has come up often here, but I do not believe someone presented a working solution yet. Jos Dreesen

15 years, 5 months

9
11
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Kryoflux folks need help

by silent700＠gmail.com

Seems they are willing to implement software support for hard-sectored 5.25" disk formats if someone can provide them with some known-good examples to work with. Preferably in the UK: http://forum.kryoflux.com/viewtopic.php?f=3&t=117 -- jht

15 years, 5 months

2
1
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Any error correction gurus in the audience?

by classiccmp＠philpem.me.uk

Hi guys, As the subject says: are there any EDC/ECC code experts hanging around on the list? I'm working on implementing the 4-byte (32-bit) ECC code Western Digital used on the WD2010 Winchester HDD Controller IC. This appears to be an implementation of the ECC scheme explained in section 7.6 of National Semiconductor's "Disk Interface Design Guide and User's Manual" (appnote AN-413). It looks like the ECC scheme is based on running a CRC forwards over the data to produce a 32-bit CRC, which is used to validate the data in the same way the 16-bit CRC validates the IDAM. Error correction apparently operates by running the CRC in reverse using an "inverse polynomial". I can't see how this could work -- isn't a CRC by its very nature a one-way operation? The application note calls this a "Glover 140A0443" code, but doesn't bother to reference any papers, books or similar on the subject. There's an example on how to program NSC's controller chips to use the code, but nothing on the mathematical background behind it. For instance: how does it work, and why is the maximum correctable error burst 5 bits long? Does anyone recognise this polynomial? x^32 + x^28 + x^26 + x^19 + x^17 + x^10 + x^6 + x^2 + 1 aka. x^32 + x^28 + x^26 + x^19 + x^17 + x^10 + x^6 + x^2 + x^0 or: 0x140A0443 It's not a standard CRC32 polynomial (according to Das Wiki), and I don't *think* it's a Fire code... though I've been looking for the original paper on those (P. Fire, "A class of multiple-error-correcting binary codes for non-independent errors". Sylvania Reports RSL-E-2, Sylvania Reconnaissance Systems, Mountain View, California, 1959) and haven't had any success -- a few hits on Citeseer, but it appears all copies of the paper have vanished into thin air. What I'd really like to find out is more about how this algorithm works... a model implementation (e.g. in C, Python or similar) would be extremely useful, but at this point even a basic worked example ("here's a chunk of data, now watch what happens if we flip some bits, and here's how we fix it") would be extremely useful... Thanks, -- Phil. classiccmp at philpem.me.uk http://www.philpem.me.uk/

15 years, 5 months

3
3
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High-Speed Computing Devices in 1950

by swtpc6800＠comcast.net

"High-Speed Computing Devices" is a report on the state of computing machines in the US that was published in 1950. I have first edition copy but it is also available on the Internet Archive. http://www.archive.org/details/HighSpeedComputingDevices My favorite part is "Table 10-1, Large-Scale Digital Computing-Machine Projects in the United States." It lists all nine operational machines with eleven more under construction. (Pages 214 and 215, the DJVU file is offset 14 pages so this starts on page 228.) The description of the ENIAC starts on page 194. The book describes the computing circuitry in detail. You can build your own accumulator with a handful of vacuum tubes. Michael Holley

15 years, 5 months

2
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need Num Lock keycap for IBM Model M

by rescue＠hawkmountain.net

Anyone have a dead model M or some keycaps around. I rescued this one from a recycle pile and it works fine.... a few key caps were off it and I found them, but missed the fact the num lock cap was missing, and now the pile has been hauled off.... so no looking for it now. Let me know if you have a Num Lock key cap. -- Curt

15 years, 5 months

2
1
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ANN: DiscFerret speaks ST506!

by classiccmp＠philpem.me.uk

Hi guys... I've just this second got my DiscFerret talking to an ST506 hard drive. Specifically, a Control Data / Magnetic Peripherals 94205-51 "Wren IIHH", apparently also known as the Seagate ST253. 989 cylinders, 5 heads, 17 sectors. It also seems to bear an uncanny shape-and-weight resemblance to a breezeblock... But anyway, I digress. First, the pretty pictures: Linear histogram: http://www.discferret.com/temp/st506/dat.lin_histogram.png Logarithmic histogram: http://www.discferret.com/temp/st506/dat.log_histogram.png Scatter graph: http://www.discferret.com/temp/st506/dat.scatter.png The log-histogram shows a very distinctive MFM timing pattern (three peaks at 1T, 1.5T and 2T), and the scatter-graph shows that the timing data is split into 17 distinctive segments: the sectors. So what's the catch? 1) The DiscFerret PSU doesn't have enough grunt to run a Winchester drive (or at least a 5.25 half-height like the Wren) and a 3.5in floppy drive at the same time. This is an academic point, because you need an adapter board to hook the 'Ferret up to the ST506 drive, and you can't have both a floppy drive and the adapter plugged in at the same time. 2) I haven't got the software decoder working. Yet. I need to play with the sync-word scanner -- the WD2010 controller chip does strange things to the IDENT flag byte. Adding a few don't-care bits to the mask and implementing a 16bit CRC should sort this out. The data looks good, but I can't prove it until I make MagScan read it. I've made a few modifications to the Microcode too: - The acquisition and RAM Write clocks have been increased to 100MHz. This provides a bit more timing resolution, and makes it a little easier to convert from a timing count to an absolute time (especially if you're reading a timing histogram and don't have a calculator). - The data separator has been partly re-implemented. I've ditched the shift-register counter in the DPLL and replaced it with a parameterised binary counter. Now the sync-word detector can run from almost any reasonable input clock rate. I've got it running at 40MHz at the moment (it used to run at 32MHz). - A FIFO has been added between the data sources (acquisition module and parallel port) and the memory write controller. I did this because there was a risk that a timing value could be lost if a transition occurred within 5 or 6 clocks of a RAM write (the previous transition, or a counter overflow). Still to do: - Make the current acquisition abort if the FIFO overflows - Decouple the acquisition and memory-write clocks. The RAM has a 10ns access time (i.e. 100MHz), and I'd like to see if the acquisition engine can be made to go faster. This should work as long as it doesn't get hit with more than 256 fast transitions in a burst... The DPLL change came about because the FPGA I'm using only allows the on-chip PLLs to be driven from a global clock input, and only one PLL can use the GCK. So for each PLL you want to use, you have to provide a separate GCK... This is a fairly easy board tweak (you bridge two pins on the FPGA with wire or solder), but it'll break backwards compatibility... :( So a good day was had by all, it seems :) The new Microcode is in the usual place (the Mercurial repository). I'll push a compiled version into the Firmware repository in the next couple of minutes. Thanks, -- Phil. classiccmp at philpem.me.uk http://www.philpem.me.uk/

15 years, 5 months

4
4
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RA70 use with the OCP / Operator Control Panel

by glen.slick＠gmail.com

On Sat, Jan 29, 2011 at 12:45 PM, Michael Thompson <michael.99.thompson at gmail.com> wrote: > I pulled two RA70 disks from a pair of VAX-3500s that I have. By some > miracle both drives spin up and go ready when the Operator Control > Panel is connected. I was thinking that one of these drives would work > nicely with the UDA50 disk controller in the 11/44 until I can get the > RA81s sorted out. > > These drives are supposed to work with the Operator Control Panel. > There is a button on the back of the drive that says Unit Number > Accept. I pushed the button both before and after power up, but the > RA70 does not spin up. > > Anyone have a manual for this drive or know how to get it work without > connecting an OCP? I have used RA7x drives with a KDA50 (M7164 / M7165) without an OCP attached to the drives. It has been a while now. I don't remember there being anything tricky about getting it to work. I was probably using either an RA72 or RA73. I'll have to look and see if I have an RA70 to try. I don't remember if I ever found any RA7x drive manuals other than this one on the net, which doesn't have all that much useful information: RA7x/SA7x Pocket Reference Guide, Order Number EK-RSA7X-PG-002 -Glen

15 years, 5 months

1
0
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RA81 Disks Will Not Spin up at the RICM.

by michael.99.thompson＠gmail.com

So far we have tried 5 RA81 and 1 RA80 disk at the RICM. They all have the same symptom, when you push the RUN button. The drive starts to spin up for just a few seconds, then stops and lights the FAULT light. We ran diags on one of the drives. The details are here: https://sites.google.com/site/ricmwarehouse/Home/equipment/dec-pdp-1144/pdp… We made sure that the heads were unlocked and the drive belt was engauged. Debug suggestions would be appreciated. -- Michael Thompson

15 years, 5 months

2
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Need RL02 Controller for PDP-11/44 Restoration

by michael.99.thompson＠gmail.com

I pulled two RA70 disks from a pair of VAX-3500s that I have. By some miracle both drives spin up and go ready when the Operator Control Panel is connected. I was thinking that one of these drives would work nicely with the UDA50 disk controller in the 11/44 until I can get the RA81s sorted out. These drives are supposed to work with the Operator Control Panel. There is a button on the back of the drive that says Unit Number Accept. I pushed the button both before and after power up, but the RA70 does not spin up. Anyone have a manual for this drive or know how to get it work without connecting an OCP? -- Michael Thompson

15 years, 5 months

2
1
0 0

Most used toys, was Re: The late, great TRS-80

by thollowell＠designdata.com

Hey Peter, Do you still have your MV7800? If so, do you want to sell it? Thanks, Tom

15 years, 5 months

1
0
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Need RL02 Controller for PDP-11/44 Restoration

by michael.99.thompson＠gmail.com

I am reassembling a PDP-11/44 from parts for the Rhode Island Computer Museum. I would like to try an RL01 or RL02 drive on the system, but we don't have another RL02 controller. Do any of you have a M7762 RL11 disk controller board that you could donate or sell inexpensively for this project? The RA81s won't spin up, so I suspect that I need to replace the starting capacitors. Do any of you know where to get replacement starting capacitors for the RA80 or RA81 drives? Details on the project are here: https://sites.google.com/site/ricmwarehouse/Home/equipment/dec-pdp-1144 -- Michael Thompson

15 years, 5 months

7
7
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Usenet

by jhfinedp3k＠compsys.to

I assume that a few of the list members still follow specific Usenet sites. A few days ago, I became aware of an additional free server for many TEXT ONLY sites. I don't want to flood them with subscriptions, so if you are a list member send me a post privately. At present, I subscribe to 2 such servers. At least one, probably both, accept posts via the Netscape browser under W98 SE which is what I use. I can't vouch for anything else, but likely IE is also acceptable. Jerome Fine

15 years, 5 months

1
0
0 0

FS: 1200 baud external modem

by charlesmorris800＠centurytel.net

FS: one "BSR 1207" external modem. New in the (very old) box. I assume it's 1200 baud. Runs on 120 vac. Can send pic to interested parties. $4.99 plus shipping (probably around $3-4, it's light) >from US zip 65775. There's one on that auction place right now 220714815493 for the same price, but he wants $16 shipping! thanks Charles

15 years, 5 months

1
0
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OT: step down voltage converters (part deux)

by brianlanning＠gmail.com

Can some of you EE types talk about the (in)efficiency of stepdown transformers? Like say a 2000 watt 220 to 110 transformer. How bad are they? brian

15 years, 5 months

5
4
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MC14500 / was Re: ENIAC ....

by shoppa＠trailing-edge.com

Brent asks: > Are there any known examples of real-world products or equipment that > used the 14500 ? > (Leaving aside evaluation boards & such.) I've seen it used in railway interlocking control panels and HVAC applications from the early 80's... places where PDP-14's had previously been used and it's pretty obvious the design was done from ladder logic principles. Interestingly, a certain generation of GRS interlocking control panels used PC boards and backplanes exactly matching the format of quad-height DEC modules. I never traced out the backplane wiring but at first glance it was nothing like Q-bus or Omnibus. > I had the impression of it as a bit of a stillborn product, like the > Fairchild CMOS Macrologic series (34700/4700 ICs), of limited > cost-effectiveness or benefit by the time it was introduced. There were many bitslice families out there that never saw wide use or maybe only existed in databooks. After the 2901 everyone tried to jump in. The MC14500B at least was obviously not a 2901 clone :-) Tim.

15 years, 5 months

3
2
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Data I/O Unipak 2B ?

by scanning.cc＠gmail.com

I just bought a Data I/O 29B with an Unipak 2B from Epay. Everything seems okay BUT the pinout cartridge ( the little module that plugs in the end of the 2B ) is missing. I suspect that all it has is some kind of simple interlock like two pins tied together to tell the Data I/O the cartridge is there ( probably so you can't run the unit with that HAZARDOUS 20 volts on the open connector. Anybody know how to get around this or fake it ? The unit won't do squat without it.... Have not been able to find a schematic of the 2B or the pinout cartridge. Thanks. Best regards, Steven

15 years, 5 months

53
215
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The Ultimate Computer

by trebor77＠execpc.com

Imaging an Alien Being totally non-Physical but infinite in Nature capable of Computing. Aren't our Brains Computers of a sort.??? They take in Inputs from all the Parts of our bodies. Process that information and act on it. Producing Output to our Optical Part of our "BRAIN" in response to sensory Input from our Optical Sensors ;"EYES",? If we see Food we eat it if we are "HUNGRY". The same can be said for all of Nature. It reacts to Sensory Input and outputs a Response. Birds can sense the Magnetic Field of the Earth and Guide themselves accordingly They also can sense the Position of the Stars and Navigate from them. The Monarch Butterfly must have a Built in Programmable ROM as when One generation flies South to Mexico in the Fall the same Individual does not make the Return trip but instead Produces Offspring along the way but those Offspring find there way back to there "HOME" Port unfailingly as does the Fingerling Salmon who traveled down the Columbia River. In Essence every thing that "MAN" has Discovered or Invented already existed in the Natural World in some Form or the Other "Food For Thought" Now theres a handy "Thought" And in closing "All Computers Need a Programmer" even a light switch. Pair up 3 and you have a "3-Way Circuit" which when activated turns on the Appropriate light. I even had a Four Way installed in my Basement. I Just added an "X" Crossover in the Circuit at the bottom of the Stairs. Works great. Turn it ON at the Top of the Stairs and you can either Turn it OFF at the Bottom or Turn it OFF over by the Sink in the Laundry Room then turn it back ON from the Bottom of the stairs for the return trip. If one used Motion Sensing Switches then One would not have to even Streach out his Hand to flip the switch. Start with 256 Switches and a Diode Matrix and you have the Makings for a Home Brew Computer. Just add circuits to each Output of the Matrix and you can control up to 255 Devices. CRUDE but effective. Replace the Devices with Logic Circuits and before you know it your Computing. Now that's Computing.

15 years, 5 months

2
1
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How many ICs does it take to put a man on the moon

by shoppa＠trailing-edge.com

Brent mentions Atwood saying: > The question about the moon landing is why haven?t we been back. > And it was done in an age where computers were as big as a couple of rooms. > If you even look at the Space Odyssey 2001 HAL the computer, and I think > that movie came out in the late 60s, HAL the computer is huge. > We didn?t yet have microchips. So I just wonder, how did they do that? > Why they haven?t done it again if it was so easy? My day job is a computer that has a $10 Billion (1980's dollars) peripheral. In other words the computer isn't the end goal :-). To think that the computer is the peripheral, sometimes trips up even the senior execs. Really the computer only exists to help the peripheral :-). Getting back to Atwood's babbling, I don't remember JFK promising to land a computer on the moon by the end of the decade. And BTW, we have sent computers to the moon, and landed them on Mars, many times since then, all in the goal of space science, not in the goal of sending computers there :-) Tim.

15 years, 5 months

1
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