test-drb May 2007

test-drb@ccmp.vtda.org

235 participants
483 discussions

by compoobah＠valleyimplants.com

> Chris M Writes: > My point was you > could mess w/hydrochloric? acid and all that (wherever > you'd find it - I know someone's going to point out > how it could be commonly had, or maybe it's a > relatively *common* thing to find).. Someone had to do it ... Muriatic acid, available at any decent hardware store. Not sure if it's strong enough, but you can find it. Sadly, nitric acid is getting a bit harder to come by. Woodelf writes: > Yep! Hydrogen ... but you don't burn it - it > was a plasma arc of some kind. I remember > reading about in Scientific American 1961 I think. Monatomic hydrogen process? Used for welding? Arc splits H2 to 2 H, which then recombines releasing energy.

17 years, 1 month

Lack of 8-bit threads (was Re: Linux question)

by classiccmp＠memory-alpha.org.uk

Hi, >....I'd also like to find one of the HP12x CP.M machines. But >I wouldn't even conisder shipping one, so it would have to be >somewhere that I could collect it from. Never come across one of those. Some 10 years ago I used to go to the Coventry radio rally every year, for about 3 years on the trot this one guy brought an original 150 with floppy and hard drives but never managed to shift it. Of course, the year I decided to buy it, I missed out on it by 5 mins.... :-( BTW I know I'm actually getting rid of stuff right now, but....I'd kill to get hold of an HP 370 or 380 (that's "9000/370" or "9000/380") with a hard drive. TTFN - Pete.

17 years, 1 month

Early desktop film recorders (was Re: Early Electronic Image Capture)

by ethan.dicks＠gmail.com

On 5/30/07, Dave McGuire <mcguire at neurotica.com> wrote: > On May 30, 2007, at 11:34 PM, Ethan Dicks wrote: > >> > I have something similar in a Polaroid product - a high-res B&W > >> CRT in a box with an internal motorized color wheel and a video input... > > ... about 6" wide, 5" tall, about 18" deep... > Ahhhhh ok. I've heard of those but have never seen one. I > believe it was (more or less) the predecessor of the computer-driven > one that my store used to sell. I don't recall the name "Palette" appearing on the outside, but I can't remember how it _is_ marked (some sort of "image copy processor"?) I'll have to check the next time I'm in the right basement. > Man, that box sounds like lots of fun! It is a lot of fun. I think it took me finding parts from 3 locations (Dayton, Uni surplus, and online) to get it working, but it's not difficult to use. In my googling tonight to remind myself of the name of it, I ran across several pages on Polaroid desktop film recorders. I had to chuckle (or was it wince ;-) at one page that decried pre-Digital Palettes as "totally useless" because they were designed for CGA and didn't work with any "modern" (VGA) output devices, nor were there any drivers. My device can be attached to a C-64 or a DVD player, or anything else with an NTSC video stream (RGB is an option for computer output) which is still ubiquitous (but for how much longer?) No OS or funky drivers required. My first test image was from a Sony LDP-1500 laser disc player since it has a nice freeze-frame when loaded with a CAV disc (but no freeze-frame at all with CLV discs - common with earlier players). -ethan

17 years, 1 month

Acorn Second Processors (was: Re: Quick survey on equipment)

by classiccmp＠memory-alpha.org.uk

Hi, > My experience is that all the second processors -- no, make that >all the 'cheese wedgrs' -- are rear. It's a shame I never got one when I picked up my other "wedges". It was always on my "list" of things to get, but they used to be reasonably easy to find at radio rallies and I always ended up finding something more interesting and leaving it for "next time".... :-( > I think you've forgotten the 'TUbe ULA' That's a 40 pin custom chip >that handles the communication between the Beeb and the second.... I certainly had. Bit of a show stopper that really.... ;-) <grin> I was just trying to remember where I'd stored that wirewrapping stuff I haven't touched for 15 years too.</grin> > The Torch Z80 board did, indeed, use only sandard chips. Changing the subject slightly, IIRC the original "Acorn 6502 Second Processor" cheese-wedge was just that, a faster 6502? Did Acorn ever release a "cheese-wedge" 65c02 or 65816? Also, is it possible to replace the 6502 in one of these with a 65c02; not that I'd actually try it, unless the 6502 was socketed, but I recall having BIG problems (in fact, total failure IIRC?) when I tried running a 65c02 in a Model B sometime in the early 90's? TTFN - Pete.

17 years, 1 month

Hazeltine 1400 info?

by dm561＠torfree.net

Date: Thu, 31 May 2007 15:30:34 -0700 (PDT) From: William Maddox <wmaddox at pacbell.net> Subject: Re: Hazeltine 1400 info? -------------Original Message: --- Richard <legalize at xmission.com> wrote: > It appears to be in good condition too. Do you > happen to know what > year this would have been manufactured? Is it one > of the Hazeltines > with core display memory that remembers the last > thing that was > displayed after you turn it off? That would be a Hazeltine 2000. I'd like to find one of those too, or one of the CDC or Bunker-Ramo terminals that used an acoustic delay line. --Bill ---------------- Reply: I scrapped one of those CDC units many years ago; now that was a "real" terminal - made a nice printer stand... Still have the delay line and a few dozen boards out of it somewhere if ya ever need any parts for one. Also a Bunker-Ramo modem >from the days when a modem was a modem... m

17 years, 1 month

82S131

by Felix.Kunz＠digitallogic.com

Dear Jay have you some PAL 82S131 for sale ? I'm looking for our PDP11 machines some. Offer me 100pc of 82S131. Thank you Felix Kunz DIGITAL-LOGIC AG | Felix Kunz | Chairman, CEO Nordstrasse 11/F | CH-4542 Luterbach | Switzerland Tel. +41 (0)32 681 58 00 | Fax +41 (0)32 681 58 01 www.digitallogic.com

17 years, 1 month

IBM AS/400 iSeries 720

by kd7bcy＠kd7bcy.com

I've been offered an iSeries 720, near as I can figure it's probably a 720-2062 but that hasn't been verified. I'm waiting to hear if they have the manuals and software still. He IS sure that it runs on 220v. So, is this worth picking up? I've always wanted an AS/400 :-) Can it be changed to run on 120v? If I don't take it, I can probably pass his info on to someone else. He's located in Washington about 30 minutes out of Olympia. Local pickup only! ------------ John Rollins | KD7BCY | http://www.kd7bcy.com Ham-Mac mailing list http://mailman.qth.net ------------

17 years, 1 month

More about the dead VAX 4000-200

by cheri-post＠web.de

Hi all, With the help of your hints, I did some measuring today regarding the voltages. The voltages of the supply all lie in an acceptable range: 12,22V, 5,17V, 3,29V, -12,25V. I observerd recently, that when I turn on the VAX, it comes up with the languages menu und then freezes. The diagnostic displays turns from F to E and then back to F. Turning it off and on again doesn't let the menu come up anymore (and the "E" on the display") anymore. It's completey frozen then. I've got the impression, that some capacitors are playing bad games somewhere. Another thing: On the KA660-board, there are four other red LEDs, which turn on all together (and stay on) and there's a green LED. In the CPU maintenance manual, it says that this green LED stands for "DC-OK". Well, it doesn't burn when power is applied... Furthermore, I measured the DCOK and POK signals: The voltage is 3,51V. Do I have to interpret that as a "signal high" ? Tomorrow, I'm going to measure the signals and voltages with an oscilloscope. Do you guys have any further hints? Regards, Pierre _______________________________________________________________ SMS schreiben mit WEB.DE FreeMail - einfach, schnell und kostenguenstig. Jetzt gleich testen! http://f.web.de/?mc=021192

17 years, 1 month

enough already

by JeLynch＠stny.rr.com

The Micron Eye used controlling the DRAM refresh (soak) rate to provide gray scale. I used a Texas Instruments 256K (512 x 512) as an imager with a Texas instruments DRAM controller to vary the refresh rate. Any ceramic package DRAM could be used after removing the metal lid and more challenging removing the polyimide protective coating. Most DRAM have redundant cells and the topography has to be decoded. There are also some "blank" zones for be bit lines. It was pretty cool back in 1986. At 10:26 PM 5/29/2007, you wrote: >On 5/29/07, Al Kossow <aek at bitsavers.org> wrote: >> > What outfit first sold digital cameras where the sensor consisted of >> > a cermet-package DRAM with the chip cover replaced by a piece of >> > glued-on glass? >> >>Micron >> >>The product was called the "Micron Eye" > >I made one of those in the 1980s... I read about the trick in Byte, >then carefully removed the lid from a 4116 and installed a bit of >slide mount cover. To test it, I stuffed the altered DRAM into an >Apple II, covered the DRAM, cleared the high-res screen, then watched >individual pixels show up when I uncovered the chip and let light fall >directly on it. > >What I never did was to take it to the next stage and decode the grid. > >-ethan

17 years, 1 month

Power plug for a VAX 4000-300

by compoobah＠valleyimplants.com

>> From what I can see amongst my VAXen it was only the QBUS machines >> that > warranted that sort of power cable; the whole thing was interlocked so > that > if there was a power cable in there you couldn't do anything other than > disconnect. Even when you wanted to remove the PSU you had to make sure > there was nothing in the way of the interlocks..... > > I've never gotten around to tracing out what that plunger under the sheet-metal does, though- my current hypothesis is that it discharges the HV caps.

17 years, 1 month

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test-drb May 2007