test-drb

test-drb@ccmp.vtda.org

101090 discussions

by icipasla＠gmail.com

*Many thanks, I found a leaking capacitor just as you have described. I've ordered new ones and will soon be able to replace it. I'll let you know if that fixes the problem (It should!).** Normand *>* Old DEC Power Control 861C Hi, *>* *>* looks like I am not getting the posting in my e-mail but my messages do get *>* posted. * This issue came up a few months back. Apparently gmail filters the replies to your own messages somewhere (and not to somewhere sensible!). Perhaps somebody else can rememebr the details. >* *>* I found this replyto my previous message by Tony Duell *>* <cctalk%40classiccmp.org?Subject=Re%3A%20Old%20DEC%20Power%20Control%20861C&In-Reply-To=%3Cm1NM4jS-000J3uC%40p850ug1%3E>in *>* the archives. *>* *>* To follow-up, the 861C emits a crackling noise for the first few seconds (20 *>* or so) and then I can hear a relay chattering (very noisy!). *>* *>* Also the light on the front panel is flashing continuously (maybe that's *>* normal.) * old DEC neons tend to flicker randomly (and it's truely random). The basic design is for the mains : Mains in--->filter --->Breaker-+--->Unswitched outs | +--->Contactor (big relay)-> Switched outs The contactor is controlled (in the 861) by a reed relay on the little PCB inside. This has a differentially-wound coil to give the 'ground for on' and 'ground for off' functionality on the 3 pin connector. The reed relay coil is powered by a little transformer/rectifier/capacitor circuit, mostly on the PCB. My first suspicioun is that capacitor. Open it up and look for any electrolytics on the PCB inside. -tony

16 years, 1 month

Disc analyser news update

by melamy＠earthlink.net

go here then... http://ww1.microchip.com/downloads/en/DeviceDoc/51242a.pdf that will at least give you debugging information that Microchip released. Steve "some chap" Thatcher -----Original Message----- >From: Tony Duell <ard at p850ug1.demon.co.uk> >Sent: Mar 19, 2010 2:44 PM >To: cctalk at classiccmp.org >Subject: Re: Disc analyser news update > >> >> On Thursday (03/18/2010 at 12:06AM +0000), Philip Pemberton wrote: >> > >> > You know, there is a reason Microchip released the ICD2, ICD3 and >> > PICKit2 Debug Express. All of the three support in-circuit debugging >> > over the programming pins -- set a code breakpoint (or watchpoint), wait >> > for it to trigger, then dump the program state. >> >> And do those debugger tools run on any OS other than Windows? > >Not that I could see. And the specs that I was pointed to by some chap >here give details on programming the PICs, but nothing on the debugger >commands, so it appers you can't write your own debugging tools. > >> >> > Beats the LEDs-and-switches debugging method, or the "hook a terminal >> > up" trick... >> >> If the answer to the above is No, then it does not beat the "hook a >> terminal up" trick... or an LED trick or plenty of other tricks... >> not by a long shot. > >Exactly. > >-tony

16 years, 1 month

Does a Northstar S-100 Bus Horizon Classify as a Classic

by trebor77＠execpc.com

I have a S-100 N* Horizon that I have been trying to get to run for years. Is there anyone out there running one or have one or Interested in one. I also have a bunch of S-100 Vector Graphic Cards, CPU, Memory, I/O Cards but no FDC's I am looking for any S-100 Serial I/O cards that I might be able to just in a Test Computer setup so I can test some of the Cards I have. Also Floppy disk controllers for the S-100 Buss. TIA Bob in Wisconsin

16 years, 1 month

Monroe calculating Machine

by harrychandler1＠mac.com

Do you still have the Monroe 8 N ? Harry Chandler Monroe Service Manager.

16 years, 1 month

Caffeine and hacking (was Re: Soldering)

by ethan.dicks＠gmail.com

On Thu, Mar 11, 2010 at 2:02 PM, Sridhar Ayengar <ploopster at gmail.com> wrote: > Chuck Guzis wrote: >> >> When Fry's... Jolt cola... bizarre chocolate-flavored diet soda (Canfields)... > > I swear by Bawls, and write a wide variety of languages on a daily basis. Bawls is good, but at my local store, I've run into a variant I like more - "Antarctica" Guarana soda from Brazil. It's stocked in the International aisles at the grocery closest to my own house (a Giant Eagle) and the store closest to a friend's house in Cleveland - so it's not just us. It tastes a bit like Bawls (vs tasting like a cola or lemon/lime drink), but I think it's smoother and less sour. It's around $3.something for a 2L, so not particularly inexpensive, but a nice treat. <http://en.wikipedia.org/wiki/Guaran%C3%A1_Antarctica> I have yet to throw it into the rotation for a serious hacking session, but with a day job sucking up evening hours, too, it's been a while since I've been able to get my head into that mode for extended periods of time. Summer is looking good (since I am consulting in the educational world right now). -ethan

16 years, 1 month

Disc analyser news update

by melamy＠earthlink.net

if you want specs to programming microchip ics, go here... http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1407 best regards, Steve Thatcher -----Original Message----- >From: Tony Duell <ard at p850ug1.demon.co.uk> >Sent: Mar 18, 2010 3:36 PM >To: cctalk at classiccmp.org >Subject: Re: Disc analyser news update > >> You know, there is a reason Microchip released the ICD2, ICD3 and >> PICKit2 Debug Express. All of the three support in-circuit debugging > >How 'open#' is this internface/specification. Is there enough detail >availble for me to write the host program for a machine/OS of my choice >(becuase I will bet the one Microchip supply doesn't run on the machine I >would want to run it on, or indeed on anythign I own) > >-tony >

16 years, 1 month

Computer Machinery Corporation?

by genedico＠tampabay.rr.com

I just came across your question about CMC. My personal knowledge is that it was a competitor of my company in 1968 when it came out with a minicomputer-based system with multiple keyboards to replace IBM keypunch machines. Two of its competitors were Inforex and Honeywell. Another competitor at the time was Viatron but that company didn't last long.

16 years, 1 month

great abandonware for your classic PC

by feldman.r＠comcast.net

>Message: 15 >Date: Wed, 17 Mar 2010 15:09:37 -0400 >From: Keith < keithvz at verizon.net > >Subject: Re: great abandonware for your classic PC <snip> >And even if there were some type of agreements, I think the "First Sale" >??Doctrine would have to kick in here somewhere. > >Even Microsoft lost(ok, gave up) their copyright suit when a college kid >??sold his Windows OS disk on ebay. > >Keith Also,? in October of 2009, Autodesk lost its suit against a man who bought a copy of AutoCAD at a garage sale and then tried to sell it on eBay: "US court says software is owned, not licensed" http://www.channelregister.co.uk/2009/10/06/software_ownership_ruling/

16 years, 1 month

AWG 30 stripping tools

by glen.slick＠gmail.com

So speaking of AWG 30, what is the best tool for stripping it for wirewrap purposes? Is something like an OK ST-500 a decent tool for around $33? http://media.digikey.com/photos/OK%20Industries%20-%20Jonard%20Photos/ST-50…

16 years, 1 month

The Hard Disk That Changed the World - IBM 305 RAMAC

by tshoppa＠wmata.com

Jos asks: >William Blair wrote: >> 5 MB (approx.) for only $3,200/month ($24,978 in 2009 dollars)! >> > I wonder what use case would justify that kind of expense, or would tape > storage not have been that much cheaper ? Undoubtedly tape is cheaper (not just per byte but also per drive) but it's not random access. Clever things were done with tapes, usually in batch mode. The RAMAC made it possible to think that multiple files (not in the computer sense but in the business sense) could be updated simultaneously in real-time. It is a fallacy to confuse the cost of a storage unit with the value that The data on it provides. Clearly as the cost of storage has dropped new applications that previously weren't economically feasible open up. e.g. When I got started in digital music in the 80's, the most technically advanced mixing systems began using hard drives instead of tape for digital music storage and manipulation. Tim.

16 years, 1 month

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test-drb