test-drb October 2012

test-drb@ccmp.vtda.org

196 participants
268 discussions

Start a nNew thread

Back from the dead - Timex Sinclair ZX80/81

by mcquiggi＠me.com

Hmmm that's what it looks like to me. Kevin Sent from my iPad

12 years, 2 months

Anyone want a DEC Letterwriter 100? Or a DEREP?

by binarydinosaurs＠gmail.com

2 actually, currently in Cambs UK and heading for the scrap pile along with the DEREP. It's rare to see them with complete keyboards! -- adrian/witchy Owner of Binary Dinosaurs, the UK's biggest home computer collection? www.binarydinosaurs.co.uk

12 years, 2 months

Interesting analog data system

by auringer＠tds.net

I ran across this auction that I thought someone here might be interested in. It is a paper punch for edge notched data storage research cards. The system is described here: http://en.wikipedia.org/wiki/Edge-notched_card http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=261115271862&ssPageName=…

12 years, 2 months

System for sale on Epay, Listed as Northstar Horizon is actually Ferguson board

by jws＠jwsss.com

This is an auction for a system on Ebay which might be interesting. It is listed as a "Northstar Horizon" but has what appears to be a single board system marked Ferguson. That would probably not be from Northstar. Also it is built up with 8" floppies which is even less related to Northstar. it appears he got a pile for a Northstar system with the Ferguson homebuilt which is in an Incoterm box which holds the floppies. There is a listing for a bigboard on bitsavers which is probably for this system. http://www.ebay.com/itm/400301360595 Price may actually be something if anyone feels a burning need for a Ferguson board, but I think its high for an ordinary Horizon. Too bad there is a missing Horizon.

12 years, 2 months

PDP1 Music / Record sold

by elson＠pico-systems.com

> From: jim s <jws at jwsss.com> > To: General Discussion: On-Topic and Off-Topic Posts > <cctalk at classiccmp.org> > Subject: PDP1 Music / Record sold > Message-ID: <507F50BC.30102 at jwsss.com> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > The fellow who posted the record some time back which was titled to be > PDP1 music reposted the record for $299 and sold it. > > the reason to note anything about it is that I had emailed him about > taking a capture of it and passing it along before selling the record > > The ebay listing up right now has a track you can download as long as it > stays up. > > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=170923504018 > > Here is the link to the song as well. > > http://ampnoise.com/mp3/MusicOnThePDP-1X_Pinafore.mp3 > > I thought it was nice of him to do that, as many people who list things > on ebay would have bothered. I would say that it was just to sell the > record, but I think the rarity of it to record collectors and a lower > price is why it sold. > > Man, what a blast from the past! A friend of mine did some work like this on a PDP-5, about 1970, at Washington U. I think the PDP-1 does a little better, but it was fairly comparable. Jon

12 years, 2 months

fine pitch soldering

by elson＠pico-systems.com

M From: Dave McGuire <mcguire at neurotica.com> To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> Subject: Re: fine pitch soldering Message-ID: <508063F0.2080503 at neurotica.com> Content-Type: text/plain; charset=ISO-8859-1 On 10/18/2012 12:21 PM, Jon Elson wrote: > > I have been doing fine-pitch soldering for a long time. I do stuff as > > fine as > > 0.4mm lead pitch, which is a bit of a pain. The bulk of stuff I now make > > with a pick and place machine and a reflow oven (converted toaster oven > > with thermocouple ramp-and-soak controller). > What type of pick-and-place system do you have? I'm looking to move in that direction. I got a VERY good deal on a Philips CSM-84. This model can hold up to about 55 8-mm feeders (capacity reduced for larger sizes) and has a vibratory feeder option and a large chip alignment station. For small chips and passives it aligns with mechanical jaws on the head. it has 3 heads, I have 2 set up with the jaws and one with no jaws to use the separate aligner. These machines are also available with vision, mine does not have that feature. It is a BIG machine, 5 x 7 feet, and needs compressed air and a fair amount of power. it is single-phase, however. It weighs about 1600 Lbs. Note that with all these machines, the feeders will probably cost more than the used machine. The CSM-84 is a VERY flexible machine, and easy to program. (The vision system needs a LOT more programming than the placement section, but once you have programmed all the parts you use, the vision doesn't need much attention.) So, I do everything from 0805 up to 30mm FPGAs with it. It is marginal with .65mm pitch parts, but does great with SO chips and all passives. If you look at other machines, check carefully about the range of parts they handle, and the consumables. Some of these machines eat several vacuum nozzles at $100 a pop every shift, and guarantee a broken nozzle on any mis-pick or tumbled part, not to mention actual crashes. The CSM is VERY robust in comparison, uses steel nozzles and can survive most crashes without much damage. Having the experience with mine, I might have been better off to get a machine with vision instead of the jaw alignment, but it all depends on the kind of stuff you do. The later machines are generally marked with a /// after the model to indicate a later computer and brushless servo motors. There is the CSM-84 VZ which has vision and a Z axis servo, and the VANE which has vision and the auto nozzle exchanger. Not so sure about the ANE system, it uses different nozzles, and they look more fragile. I have made a big nozzle for FPGAs with a lathe and mill for my machine. I paid about $3600 for my machine including shipping and about 50 feeders. It cost me more than that to have a double door installed on my basement to get it inside! Obviously, I had a motivated seller who needed to get this machine off his floor to make room for new machines already in transit. Every day I communicated with him, the deal got sweeter. First, just the machine, then some feeders, then lots more feeders (all he had) then a box of spare parts. One thing is to get a machine that is highly regarded by the community (there are some REAL lemons out there) and be sure to get the manuals including the service manuals, because something WILL go wrong on these older machines. They ARE complex, mine has over 50 sensors and about 25 actuators. Jon cctalk-request at classiccmp.org wrote: > Send cctalk mailing list submissions to > cctalk at classiccmp.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://www.classiccmp.org/mailman/listinfo/cctalk > or, via email, send a message with subject or body 'help' to > cctalk-request at classiccmp.org > > You can reach the person managing the list at > cctalk-owner at classiccmp.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of cctalk digest..." > > > Today's Topics: > > 1. Re: fine pitch soldering (Chuck Guzis) > 2. Re: It lives! (Liam Proven) > 3. Re: It lives! (Ethan Dicks) > 4. Re: It lives! (David Riley) > 5. Re: It lives! (barythrin at gmail.com) > 6. Re: It lives! (Shoppa, Tim) > 7. Re: It lives! (John Many Jars) > 8. Re: PDP1 Music / Record sold (barythrin at gmail.com) > 9. Re: It lives! (David Brownlee) > 10. RE: Skipware level, late 2012 (John Foust) > 11. Re: fine pitch soldering (Dave McGuire) > 12. Re: Dead LCD monitor? - replace $2 worth of caps - Re: > Skipware level, late 2012 (John Foust) > 13. Re: UCSD-P for the WD-900 ? (Eric Smith) > 14. Re: fine pitch soldering (Dave McGuire) > 15. Re: fine pitch soldering (Ryan Brooks) > 16. Re: fine pitch soldering (Chuck Guzis) > 17. Re: fine pitch soldering (Dave McGuire) > 18. Re: Desoldering Pump (Paul Anderson) > 19. Re: An 80386 CPU S-100 Board (Tony Duell) > 20. Re: An 80386 CPU S-100 Board (Paul Anderson) > 21. Re: Anyone want a DEC Letterwriter 100? Or a DEREP? (Dave McGuire) > 22. Re: Anyone want a DEC Letterwriter 100? Or a DEREP? (Dave McGuire) > 23. Re: An 80386 CPU S-100 Board (Ethan Dicks) > 24. Re: Anyone want a DEC Letterwriter 100? Or a DEREP? (ben) > 25. Re: Anyone want a DEC Letterwriter 100? Or a DEREP? (Ethan Dicks) > 26. Re: An 80386 CPU S-100 Board (mc68010) > 27. Re: Dead LCD monitor? - replace $2 worth of caps - Re: > Skipware level, late 2012 (Toby Thain) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Thu, 18 Oct 2012 10:26:32 -0700 > From: Chuck Guzis <cclist at sydex.com> > To: General Discussion: On-Topic and Off-Topic Posts > <cctalk at classiccmp.org> > Subject: Re: fine pitch soldering > Message-ID: <50803BC8.3080004 at sydex.com> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > On 10/18/2012 09:21 AM, Jon Elson wrote: > > >> The MOST important thing is a >> stereo zoom microscope with a long working distance. A working >> distance of 2-3" is necessary to get your hands and a soldering iron >> under it. A ring light can be made from a ring of PC board material >> that fits around the snout of the microscope. Carve a ring in the >> copper of the PCB so it becomes two concentric rings. Use a 12 V >> DC wall-wart power supply and 8 while LEDs, with about 1 K Ohm >> series resistors. >> > > Agree on the stereo microscope (dissection microscope). I find that the > CCFL ring lights made for cars and motorcycles are cheap and give much > more intense and even (shadowless) light. Typical diameter is about 100 > mm and all seem to come with mounting clips or tabs. You can also get > them in LED, but I find the light from a white CCFL much easier on the > eyes. Cheap inverters are available to run the CCFL lamps. I use the > microscope for initial positioning and completed inspection and prefer > to use a binocular loupe during the actual soldering. > > >> Solder braid can be used to remove excess solder bridging the >> leads, which WILL happen frequently. For big, high-density >> chips, this is my procedure: First, put a tiny dab of solder >> on 2 corner pads. Align the chip with the pads, and solder >> the corners that have the extra solder. >> > > For large TQFPs, I anchor the chip body to the PCB with a dab of clear > nail polish, using the microscope for accurate positioning. Once the > polish has set, I proceed with the corner soldering. I find that I can > get extremely good registration this way. It's not fast, but it's > nearly foolproof. > > FWIW, > Chuck > > > > > ------------------------------ > > Message: 2 > Date: Thu, 18 Oct 2012 18:34:58 +0100 > From: Liam Proven <lproven at gmail.com> > To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org> > Subject: Re: It lives! > Message-ID: > <CAMTenCHLomP=yvz6sQsA0VAc4FzqKoJHd4+in98H9GKstg=OYQ at mail.gmail.com> > Content-Type: text/plain; charset=windows-1252 > > On 18 October 2012 15:41, Francois Dion <francois.dion at gmail.com> wrote: > >> I thought I had sent this to cctalk, but apparently not. There are now >> 3 clues up, because I posted about it on tuesday, one hint a day. >> >> >> Guess what computer I brought back from the dead? >> >> http://raspberry-python.blogspot.com/2012/10/it-lives-hint-1.html >> >> I'm thinking somebody on this list has used one and will recognize it. >> Just a simple screenshot to start with... >> > > I was going to guess Apple II or that era from the BASIC prompt of ] > but not given the later hints... > >

12 years, 2 months

cctalk Digest, Vol 110, Issue 49

by elson＠pico-systems.com

cctalk-request at classiccmp.org wrote: > Agree on the stereo microscope (dissection microscope). I find that the > CCFL ring lights made for cars and motorcycles are cheap and give much > more intense and even (shadowless) light. Yes, they are almost perfect. BUT, they are usually too big in diameter. By custom making one with LEDs, you can fit it to be completely snug to the microscope body and sit up against the sides of the microscope, so it is as far out of the way as possible. We got a ringlight with a new Chinese scope at work, but it hung below the bottom of the scope and was over an inch wider than the scope itself, so I replaced it with my own LED ring light. > For large TQFPs, I anchor the chip body to the PCB with a dab of clear > nail polish, using the microscope for accurate positioning. Once the > polish has set, I proceed with the corner soldering. I find that I can > get extremely good registration this way. It's not fast, but it's > nearly foolproof. > I'm doing 0.4mm pitch chips, and have excellent alignment, also, with my method. Whatever works for you. Jon

12 years, 2 months

Desoldering Pump

by robert.jarratt＠ntlworld.com

I find myself in need of a new desoldering pump. I found a number on the Farnell site, anyone have any recommendations for a good one that does not cost more than ?25ish (about $40) and for which I can get spare nozzles? Here is the page: http://uk.farnell.com/jsp/search/browse.jsp?N=2031+204695&Ntk=gensearch&Ntt= desolder+pump&Ntx=mode+matchallpartial Regards Rob

12 years, 2 months

UCSD-P for the WD-900 ?

by jdr_use＠bluewin.ch

Are images of UCSD-P for the Pascal Microengine available somewhere ? That would be version III of the UCSD-P system. Jos

12 years, 2 months

The Most Wonderfully Ridiculous Movie Computers of All Time

by elson＠pico-systems.com

From: Jason McBrien <jbmcb1 at gmail.com> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Subject: Re: The Most Wonderfully Ridiculous Movie Computers of All Time http://www.starringthecomputer.com/feature.html?f=50 Weird analysis about the VAX 780 in Seven - I don't think it's outside the realm of possibility that a police department would still be using one in the mid-90's. The college I went to was still chugging along on an old Amdahl 370-clone in the same time period - as the primary mail server and host for various licensed apps (mainly SPSS) I have NO difficulty believing municipal departments would hang on to old gear as long as it would stay reasonably reliable. And, there is even STILL no shortage of VAX-11/780 parts at the brokers, if you know how to run the diags and swap boards. You could even repair the machine at the chip level with a soldering iron, solder sucker and dikes. There are pretty much NO custom parts in the entire machine except the fixed microcode fuseible PROMS, the LSI-11 and the inductors in the power supply modules. Given IT wasn't the hot cost center it is today, I'd imagine most police departments would be loathe to shell out for an upgrade to something that still probably worked just fine. Now, why the director put that thing the precinct room is another question. Artistic license? Now, that is VERY funny! Anyone who has ever walked behind a running 780 with a handful of papers at mid-thigh level knows what those cooling blowers will do! I can imagine the whole room being filled with whirling sheaves of paper! For those who don't know the 780 as well as I do (I was sysadmin on two of them, and also did a lot of hardware hacking and interfacing on them) they had 3 one-half Hp (I think) centrifugal blowers that sucked air down through the card cage and blew it out the back of the cabinet through 3 fairly small vents. The air shot out at at least 50 MPH, probably more. The 780 has a card cage that ran the entire length of the ~5' long cabinet, CPU at the left, memory in the middle and I/O sections at the right, IIRC. (Hmmm, have a vague recollection maybe the memory was at the left....) Power supply boxes were below the logic cards, blowers below that, and LSI-11 and it's floppy drive at the bottom left. Jon

12 years, 2 months

← Newer
1
...
12
13
14
15
16
17
18
...
27
Older →

Jump to page:

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

test-drb October 2012