test-drb January 2011

test-drb@ccmp.vtda.org

130 participants
209 discussions

PSU for MicroVAX 3400 Not Faulty But Not Working

by robert.jarratt＠ntlworld.com

A while back I mentioned that I have a MicroVAX 3400 with one of the H7868 PSUs not wanting to work (green light fails to come on). I have just tried the "faulty" PSU in a MicroVAX 3500 and it works just fine. I took a PSU >from the 3500 and put it in the 3400 and it does not work in the 3400 either, only in the 3500. So clearly there is something else that is causing the problem and I am looking for suggestions, especially as the machine is in an awkward location and hard to dismantle speculatively. As a reminder this machine was working fine and I had not done anything at all to it prior to its failure, I had not moved it, changed any components or anything. Regards Rob

13 years, 10 months

OT: american vs european 220

by brianlanning＠gmail.com

In the US, two separate 110 legs are delivered to the house. When we need 220, the magic of constructive interference is applied, and we get 220. The 220 is delivered to the appliance as two separate 110 wires, a neutral wire, and sometimes a separate ground wire for safety. Because of this arrangement, sometimes appliances (I believe, maybe I'm wrong) will pull 110 from one of the legs to power electronics in the appliance. But I think european 220 doesn't work this way. Is one 220 leg delivered to the house? And the electronics work off that 220 leg? Or are two 110 lines delivered and every outlet gets the sum of those two 110 lines? If it's not two separate legs, I'm thinking that it will be impossible to wire an american 220 appliance to work with european 220. Is this right? brian

13 years, 10 months

Tektronix 4010/4014 terminal printer project

by legalize＠xmission.com

OK, I've been studying the circuit diagrams and service manuals for the Tektronix 4014 printer interface: <http://bitsavers.org/pdf/tektronix/401x/070-2303-00_4014_4015_Service_Mar79…> <http://bitsavers.org/pdf/tektronix/463x/070-1831-02_4631_Service_Nov79.pdf> I'm starting a project to create a modern printer interface for the terminal. This involves creating the optional target signal amplifier board for the 4010/4014 and creating a microcontroller based board that will drive the terminal like a 4631 printer and scan out the image from the storage tube for digitizing as a digital image. The amplifier board is what distinguishes a 4010/4014 from a 4010/4014-1 and provides the signals for the printer. The original 4631 printer is a completely analog device that scans out the storage tube and transfers the electrical signal to a dry silver paper for printing. This design will treat the analog signal supplied to the printer as a signal for digitizing into a raster image. I plan on housing mine inside a 4632 video hardcopy shell with a modern printer inside driven by the controller. Who knows, this project might make those 4631/4632 printers useful again, considering that noone is going to be getting a new supply of dry silver paper anytime soon. I'm looking for other people that have hardware design experience to join me on this project. All resulting EDA files will be made available under a suitable open source style license. Please reply to me off-list if you are interested in collaborating with me on this project. -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://legalizeadulthood.wordpress.com/the-direct3d-graphics-pipeline/> Legalize Adulthood! <http://legalizeadulthood.wordpress.com>

13 years, 10 months

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

13 years, 10 months

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

13 years, 10 months

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.

13 years, 10 months

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

13 years, 10 months

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.

13 years, 10 months

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>

13 years, 10 months

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

13 years, 10 months

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test-drb January 2011