test-drb August 2012

test-drb@ccmp.vtda.org

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247 discussions

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monitor arcing?

by rampaginggreenhulk＠yahoo.com

dark powdery residue around power switch. 1986. Simple arcing or an indication of something worse?

11 years, 8 months

Wall warts (was Re: LPC1768 tiny terminal emulator)

by jonas＠otter.se

On Tue, 28 Aug 2012 20:28:07 +0100 (BST), ard at p850ug1.demon.co.uk (Tony Duell) wrote: > Of course wall-warts are country specfic in that the mains voltage and > conenctor are different in differnet countries. So I've probably never > seen a modern one intended for use in the USA and thus UL listed > > But the ones we get over here have no protective devices at all. No fuse, > no thermal fuse. If you are lucky, the resistors in a swithc-mode wall > wart are fusible, flameproof types. Most of the time they are not. In Europe, mains devices have to be CE-certified and display the CE mark. But the manufacturers certify themselves that their products are compatible with the regulations, nobody actually tests them unless it is necessary to prove that they do not comply, e.g. if a competitor reports them to the authorities as being non-compatible, or they are suspected of being the cause of an accident, or they are suspected of being fake. Devices made in China may show the "China Export" symbol, which is very like the CE mark and may be easily confused with it (= is meant to be confused with it?) http://www.icqc.co.uk/en/china-export.php but does not mean that the device complies with EU regulations. /Jonas

11 years, 8 months

Forward Electronics KS1-NCD 123KEY SUN TYPE 5 Keyboard

by mark＠wickensonline.co.uk

Anyone have any experience with these keyboards? I'd be interested in knowing whether the differ significantly in feel compared to the standard type 5. http://www.ebay.co.uk/itm/Forward-Electronics-KS1-NCD-123KEY-SUN-TYPE-5-Key… Thanks, Mark -- http://www.wickensonline.co.uk http://declegacy.org.uk

11 years, 8 months

N8 PCB availability

by LYNCHAJ＠YAHOO.COM

Hi Only one of the N8 PCBs remain. Several builders have their and have them working. It is going well so far. Here are some photos of Martin's N8 build http://n8vem-sbc.pbworks.com/w/browse/#view=ViewFolder <http://n8vem-sbc.pbworks.com/w/browse/#view=ViewFolder&param=N8-2312%20Mart in%20Lukasek> &param=N8-2312%20Martin%20Lukasek and some more general information here http://n8vem-sbc.pbworks.com/w/page/54039670/N8%20announcement If you would like to get your own N8 PCB please contact me. I will be gathering up boards for another PCB order soon. The PCBs are $20 each plus $3 shipping in the US and $6 elsewhere. Please send me an email at LYNCHAJ at YAHOO.COM Thanks and have a nice day! Andrew Lynch

11 years, 8 months

Acorn Atom - more ebay craziness

by barythrin＠gmail.com

Of course, you know how using ebay for determining the market goes. First sells for exponentially more than common. Another turns up and watch it end at 57.00. ;-)

11 years, 8 months

Wall warts (was Re: LPC1768 tiny terminal emulator)

by tshoppa＠wmata.com

> For linear wall-warts, the transformer primary is _supposed_ > to burn out in a safe manner if the thing is overloaded. My > (accindental) experience is that they do not. The transformer > can get hot enough to soften the plastic case, but it does not burn out. I thought that many (most?) wall warts were "impedance protected". i.e. the winding resistance + inductance of the device is set such that thing might get hot and buzz in a short circuit but will not catch on fire. Like those small AC motor windings. Some folks think UL rating means that the device is reliable, or well engineered in some hypothetical sense, but really what it means is that it won't start a fire. Impedance protection is one of the reasons why unregulated wall warts have such high delta between loaded and unloaded voltage (often as much as a factor of two). They are designed with high internal resistance to provide the impedance protection.

11 years, 8 months

Acorn Atom - more ebay craziness

by jules.richardson99＠gmail.com

http://search.ebay.com/251105620795 Hardly Apple I territory, but 1,100.00 GBP (~ 1700 USD) is an incredible amount for a home computer which occupied the middle ground: not as ubiquitous or famous as the Spectrum, C64, BBC micro etc., but not as rare or desirable as those which came before it (ZX80, Acorn System 1 etc.) It's not as though it's an early release or one of the ones sold in kit form. The lack of serial number on the case raises the possibility that the case and PCB weren't paired at the factory (which surely makes it non-original and a mongrel :-) I can't even begin to make sense of most ebay sales, but what do people think? Just someone with rather deep pockets? Or perhaps the seller buying it back themselves in order to create an inflated sense of 'market value' (and with the intention of re-listing it under a different account in a few months)? cheers Jules

11 years, 8 months

MINC DECLAB23 complete system and documentation

by fgara＠comcast.net

Please find pictures of the MINC/DECLAB23 in my possession. I am interested in selling all, preferably, or part of the following: http://img580.imageshack.us/img580/2537/img0020lm.jpg http://img443.imageshack.us/img443/6893/img0022gu.jpg http://img802.imageshack.us/img802/7195/img0025n.jpg http://img571.imageshack.us/img571/4470/img0026tk.jpg Boards in the MINC DECLAB23 Chassis: DEC-LAB 1) MINCAG PREAMP 2) MNCAD A/D CONVERTER 3) MNCAA D/A CONVERTER 4) MNCDO DIGITAL OUT 5) MNCDI DIGITAL IN 6) MNCKW CLOCK CPU 1) M7954 2) M8043 3) M8014 4) M8013 5) M8044DC 6) M8044DH 7) M8186 Extras: SPARE 1) M7071 (Wave Generator) 2) M8659 The complete system includes: 1) VT-105 with Graphic Package 2) RL01 2-Bay Hard Drive (Cartridge Type) 3) LA 120 DECWriter III Terminal 4) All Original Manuals (RT-11 and DECLab23), all software Dispatch documentation 5) No. 20 Software Cartridge Disks, No. 3 New Cartridge Disks (all for RL01) For more information please send inquiries to fgara at comcast.net

11 years, 8 months

The fall of CP/M?

by alanp＠snowmoose.com

On 8/27/12 10:00 AM, cctech-request at classiccmp.org wrote: > On Mon, 27 Aug 2012, Jim Brain wrote: >> >Can you cite some sources for this position? Sources I have note that >> >Patterson wrote a new OS to go with the Seattle Computer Products 8086 >> >kit and used CP/Ms API to aid in porting apps, but the internals were >> >significantly different. If true, I'm not sure I'd call that a "port". >> >If so, then Linux is a "port" of BSD or ATT UNIX. > I will concede that "port" is a poor choice of terms. > Patterson wrote it as a placeholder. The intent was that they would go to > CP/M-86 when that was ready, and QDOS ("Quick and Dirty Operating System") > was intended as a temporary substitute until then. So, I'm hesitant to > call it a "new OS" > Could you at least spell Tim's last name correctly? It is 'Paterson'. And a recent code analysis indicates that QDOS was not stolen from CP/M - http://m.spectrum.ieee.org/computing/software/did-bill-gates-steal-the-hear… If he didn't copy it from CP/M, why isn't it a "new OS"? alan

11 years, 8 months

recreation of a nearly 30 year old environment.....

by quapla＠xs4all.nl

For those who are in an exploring mindset, try 'telnet nexus-core.xs4all.nl 10001' uid/pwd guest1/guest1 Ed -- Dit is een HTML vrije email / This is an HTML free email. Zeg NEE tegen de 'slimme' meter.

11 years, 8 months

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test-drb August 2012