test-drb

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101090 discussions

MicroPdp-11 H7864 power supply question.

by julianskidmore＠yahoo.com

Hi folks, I have a H7864 PSU for a pdp11 (Rev C1 or Rev-12) which blew up last friday. A friend and I found out that the only thing that had gone wrong was that a 0.47uF X2 Cap had failed, so I bought a replacement and I've soldered it on now. So, maybe the PSU will work! However, there's an internal lead called J11 with a funny socket on the end: It looks like this (if you view in fixed point) [Side view] [Front view] [Plugs into ] [Which looks like on the outside of the casing] +------+ _____ | : : | / 230 \ _____ | : : | > < __/\ | " " | | : : | \_____/ =======| / ------- +------+ \_/ \###/ The far end of the lead connects to a PCB where it says "+Fan 1-" Now I think that when I dismantled the PSU I unplugged it from the bottom two prongs of a 6 pronged plug of which the other side displays "230" through a glass panel on the outside of the casing. There are connections and a resistor across the other 4 prongs of that plug. I figure that the the 6-pronged plug is for selecting the mains voltage, which in my case is 230-250v as I'm in Europe, but what are the bottom two prongs for - how could they power the fan? I was pretty sure I needed to plug J11 in - and this is the only place I could find and it's a tight fit! However, when I dismantled the PSU for my microVax II I found that J11 isn't plugged in at all! So, I'm not sure what the correct connections are. My choices are: 1. It doesn't matter if it's plugged in or not (unlikely, since fan cooling is important). 2. It should be plugged in on the pdp11 AND the microVax, so I should plug it in on the MicroVax II too. It'll only go in one way, it'll collide with the PCB with the 0.47uF X1 cap if I try it upside down. 3. It shouldn't be plugged in either of the machines and so the microVax is correct and the pdp11 is wrong. 4. It should be plugged in the pdp11, but not the microVax. Note: the MicroVax has a later power supply, Rev E1 >from 1983. Sorry to be pedantic about all the connections, but advice would be helpful! -cheers from julz @P __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

18 years

INL0397-1

by eberhard.hewicker＠t-online.de

Hi Randy, I have come across your below posting. Can you offer INL0397-1 for a favourable price? I would need 20 ea. Can you offer TIL308 or TIL309? Mit freundlichem Gru? Eberhard Hewicker Obere Waldstra?e 3 56424 Mogendorf Deutschland Subject: replacement for TIL311 display From: cctech (at) classiccmp.org (Randy Gill) Message-id: <012701c30e56$5b3a4e70$c302010a (at) innocor.com> Date: 2003-01-03 17:00:23 _____ Hello; I just noticed your e-mail on the web. I wanted to inform you that Innocor manufactures a direct, drop-in replacement for the TIL311 (INL0397-1) featuring less power, brighter LEDs, lower cost and higher reliability. Pls find the link to our datasheet. If you have any requirements, pls let me know. Regards; Randy <http://www.innocor.com/documents/inl0397_v2_iss2.pdf> http://www.innocor.com/documents/inl0397_v2_iss2.pdf

18 years

OK, now this is impossible (11/23+ and RL02-RLV12 problem)

by tiggerlasv＠aim.com

Equally annoying -- I've had that problem before, but it was so long ago, I can't remember what the problem was. I have some suggestions. They are admittedly shots-in-the-dark. Some may not even seem logical, based on your symptoms, but it can't hurt to try them. . . Physically disconnect all but one drive. Make that unit "Drive 0", and try booting. (Don't forget to move your terminator over.) If it still gives you the problem, change out the drive select cap, and make it drive 1. Try again. Make sure all of the other drives are powered down and disconnected during the attempt. I seem to remember having either XXDP or RT11 wig-out, because of some quirk with the number of drives attached to the controller, and/or something flaky with the drive select caps. I also had some problem with boot errors when I had two adjacent drives in the rack. It turns out, I had the boot drive positioned half-way out of the rack on the sliders, and it was picking up noise from the drive above or below it.) I'd try "rolling your own" pack with SIMH, and VTServer. Boot XXDP under SIMH using 11/23 emulation with 512K, and make a new XXDP disk on an emulated RL02 pack. Then try transferring it to a blank RL02 with VTServer. NOTE: VTserver will blindly write to the disk, and completely ignores any BAD SECTOR information on the existing pack. So, if you're using a pack with bad spots, it's going to write data over the bad areas, and you'll wind up with an unreliable pack. I hope this helps. . . . T

18 years

Some information on Micron Optic Rams

by nanoman＠stny.rr.com

Jane, If you are interested. As a student (several decades ago) I developed several 64K and 512K DRAM cameras. I used TI and Intel DRAMs (at the time I was unaware of the Micron opticRAM). In its day, I thought this was pretty cool. The DRAM was attached via tether to my computer and I varied the refresh rate to get gray scale. Assembly language is a beautiful thing (or a nightmare). Of course the real trick was to remove the ceramic package lid and polyimide protective "goop" to reveal the chip die imaging surface (without damaging the die). Anyway, I have attached the covers of Mircro IS32 and IS256 information that I readily found. I believe I may still have the MicronEye Camera and Manual, as well as other information. If you would like copies of this information let me know. I will be out of town for a week or so (and I will have to recall where I have stuff the other information). Why are you interested in the OpticRam? Enjoy, Jim

18 years

Seeking Xceed Color30 card

by dgriffi＠cs.csubak.edu

I'm trying to find a Micron Xceed Color30 card and Greyscale30 card for a Mac SE/30. What I'm trying to do is enable 8-bit greyscale on the internal monitor. I've seen brief references to a clone of this sort of thing, but nothing more. -- David Griffith dgriffi at cs.csubak.edu

18 years

Safety precautions. Was: Help with ICL power supply faul

by roger.holmes＠microspot.co.uk

On 11 Apr, 2008, at 18:00, cctalk-request at classiccmp.org wrote: > > Message: 12 > Date: Fri, 11 Apr 2008 09:31:49 -0700 > From: "Chuck Guzis" <cclist at sydex.com> > > Those with big iron with high-current line-side requirements are > advised to use the "one hand in a rear pocket" technique when poking > around in a PSU. Good idea, thanks for that. Last time I poked around in one of my 1301's PSUs it was seven feet up in the air and I jiggled the stabiliser rack and the -22.6v, quarter inch bus bar touched the frame, showering me with sparks and burning a notch into the angle iron frame :-) Its not just AC that's dangerous on big iron. Over the years I've been bitten many times by 240v and no ill effects but I get very careful when near the three phase 440v supply, or near car H.T. leads or any thermionic valves, especially CRTs. Roger Holmes.

18 years

IS32 Optic RAM Datasheet and Steve Ciarcia's Micro D-CAM Artical

by rdawson16＠hotmail.com

Thanks Dave! What a trip down memory lane (pun intended) I worked for Micron in the Imaging Group until July, when the whole camera / cell phone market had a meltdown. The imaging group was spun off as a separate company, and we were to move from Boise Idaho to San Jose. Needles to say, most of us in my group that built new silicon test probe and DUT cards left. Like sure, are you going to double our salary to afford to live in San Jose? And leave beautiful Idaho? Micron Imaging is now Aptina: http://www.aptina.com/ You might get to see our last project filming the athletes at the Beijing Olympics. We built a ultra high resolution imager as a technology demo, Ultra HD resolution, 16x HD, 4k x 4k resolution. Its also very high framerate, 1K frames per second. I did the data pipes to stream the video off of the part, 16 750MHz LVDS differential pairs.... Randy > From: dave06a at dunfield.com > To: cctalk at classiccmp.org > Date: Fri, 11 Apr 2008 07:47:00 -0500 > CC: jwallis at fbiacademy.edu > Subject: Re: IS32 Optic RAM Datasheet and Steve Ciarcia's Micro D-CAM Artical > > > Mr. Dunfield, > > > > In a 2004 posting you indicated that you had a copy of the Micron Technology IS32 OpticRAM data > > sheet. Have you ever scanned the document? Would it be possible to obtain a copy? > > > > Your assistance would be appreciated. > > Jane Wallis > > I have placed the IS32 and Micro D-CAM articals at: > > http://www.dunfield.com/pub/index.htm > > I will leave them there for a few days - please download asap. > > -- > dave06a (at) Dave Dunfield > dunfield (dot) Firmware development services & tools: www.dunfield.com > com Collector of vintage computing equipment: > http://www.classiccmp.org/dunfield/index.html _________________________________________________________________ Get in touch in an instant. Get Windows Live Messenger now. http://www.windowslive.com/messenger/overview.html?ocid=TXT_TAGLM_WL_Refres…

18 years

Help with ICL power supply fault (Farnell SMPS)

by cclist＠sydex.com

On 11 Apr 2008 at 2:53, Tony wrote > The right way to do it, of course, is to use an isolating transformer, but > not everybody has one of those in the workshop. This is something that anyone who owns a screwdriver and a soldering iron should have if one intends to go poking around in the "guts" of powered equipment. Fortunately, it's easy for us in the US and Canada (and Japan) where mains power is 120v. Just about anything with a transformer in the PSU (still pretty common in audiophile gear, as are large electrolytics) has been constructed with a "universal" 100/120/220/240 transformer, meaning that there's usually a split primary, so one primary winding can be used as input and other, as output. (the other windings can be left NC). Those in 220/240 volt-land can use two transformers of the same secondary voltage connected back-to-back as an isolation method. Another option is to scavenge a transformer from a UPS--it's very common that the same transformer is used to charge the batteries and as an inverter output, meaning that there are often two sets of line- voltage windings present. I have a box with a large scavenged UPS transformer and a Variac for my workbench--and its own 5 amp fuse. Not only do I get isolation, but I can adjust the output voltage--and I don't have to rely on tripping the 20A distribution panel breaker when something goes wrong. This is particularly important with some of the old hobbyist gear-- IIRC, the MITS Altair ran a couple of bare PCB traces at line voltage to the front-panel power switch. Those with big iron with high-current line-side requirements are advised to use the "one hand in a rear pocket" technique when poking around in a PSU. Cheers, Chuck

18 years

Fwd: [roys-tech-chat] Building replacement for TTL counter DM8552 (National Semiconductor)

by rtellason＠verizon.net

Have any of you guys ever heard of this chip? It's new to me... ---------- Forwarded Message ---------- Subject: [roys-tech-chat] Building replacement for TTL counter DM8552 (National Semiconductor) Date: Thursday 10 April 2008 08:58 From: "Michel" <itloiiw at yahoo.com> To: roys-tech-chat at yahoogroups.com Hello all, I am trying to repair a Systron Donner Frequency Counter model 6254 that does not count well. This counter is build with "simple" TTL chips only. (I have no manual nor schematic). The culprit (found by swapping chips) is a TTL chip from NS : DM8552 It is a decade counter with latches and tri-state outputs. Since I did not find any source for replacement chip, I have thought to build some equivalent circuit with maybe 74LS160 and 74LS393. My problem is that I have no datasheet except pinout for DM8552 (found there http://www.datasheetarchive.com/pdf/1215336.pdf ). Does anybody have more information about it ? Many thanks in advance, Michel Grenoble - France. ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/roys-tech-chat/ ------------------------------------------------------- -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin

18 years

eric's read9144 program

by aek＠bitsavers.org

here http://svn.brouhaha.com/viewvc/read9144/ There is a known problem with it dealing with HP backup tapes that have end of file set on the first block, but it knows how to talk CS80 through the linux library.

18 years

PC <-> HPIB <-> CS80 stuff ; was HP-IB drive simulator

by aek＠bitsavers.org

> I also took another look at the Linux-HPIB project and > see that it has been rekindled. Unfortunately, I was not able to get a good > build on my system. It's probably an incompatability in the kernel... I would suggest looking at this more seriously. Eric Smith wrote a program using this to do block level reads of 914x tapes a few years ago.

18 years

HP-IB drive simulator

by dbetz＠xlisper.com

Has anyone invented a way to use a PC (or Linux or a Mac) to emulate an HP-IB drive for the purposes of providing mass storage to an HP85 or HP87 computer? I know such a thing exists for emulating Atari drives on a PC. Has anyone done anything similar for HP-IB?

18 years

Bringing up an older Mac

by dgriffi＠cs.csubak.edu

I've just brought up a Mac SE/30 with fresh disks and noticed that the monitor occasionally gets wavy or shudders. How should I proceed in fixing this? For those interested: Apple has all sorts of old stuff at http://www.info.apple.com/support/oldersoftwarelist.html You'll need the Linux version of Stuffit from ftp://ftp.allume.com/pub/archive/linux/StuffIt/stuffit520.611linux-i386.tgz. Unstuff the file you get from Apple, the Unstuff the .data file. Then make the disk like this: dd if=System\ Startup of=/dev/fd0 bs=84 skip=1 -- David Griffith dgriffi at cs.csubak.edu A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

18 years

Hitachi HN27C1024HG-85

by adamgolas＠earthlink.net

You've written me that you have HN27c1025HG-85 but I am looking for HN27c1024HG-85. If you have what I am looking for please let me know the price. Thank you, Adam Golas

18 years

IS32 Optic RAM Datasheet and Steve Ciarcia's Micro D-CAM Artical

by jwallis＠fbiacademy.edu

Mr. Dunfield, In a 2004 posting you indicated that you had a copy of the Micron Technology IS32 OpticRAM data sheet. Have you ever scanned the document? Would it be possible to obtain a copy? Your assistance would be appreciated. Jane Wallis

18 years

Help with ICL power supply fault (Farnell SMPS)

by pcoghlan+cctech＠vms.eurokom.ie

> >One way to achieve isolation is to get a couple of filament transformers that >are of similar voltage ratings and use them both, tying both low-voltage >windings together and using one primary as the output. I'd think that they >wouldn't need to be particularly hefty if you're not going to load the supply >much. > Another approach I keep meaning to try out, also for small loads, is a bathroom shaver outlet isolating transformer. Many, like the one in my junk box, also have the advantage of providing a choice of output voltages so that equipment designed for the other side of the Atlantic only can also be tested. (I last thought of this approach just after I blew the input fuse in a small SMPSU after somehow managing to confuse myself about which were the input rectifiers and which were the output rectifiers. But it was too late then so I didn't bother...) One thing that puts me off though is that I vaguely remember reading a report from someone who had a SMPSU that behaved even more bizarrely than these things usually do when it was powered through a less than ideal isolating transformer. Regards, Peter.

18 years

Fwd: [comp.sys.sgi.hardwar...] Power Challenge XL available

by Arno_1983＠gmx.de

Richard <legalize at xmission.com> wrote: > This message has been forwarded from Usenet. To reply to the > original author, use the email address from the forwarded message. > > Date: Wed, 9 Apr 2008 00:39:44 -0700 (PDT) > Groups: comp.sys.sgi.hardware,comp.sys.sgi.admin > From: "fischerc at itam.cas.cz" <fischerc at itam.cas.cz> > Org: http://groups.google.com > Subject: Power Challenge XL available > ======== > Hi everybody > We have a rather big piece of HW: SGI Power Challenge XL (6 x R8000 at 75 > MHz, 1G ram, a few 2-4Gb SCSI discs) available here in Prague (CZ, > EU). > The computer was cleanly shut down on May 5, 2004 and since that time > was not touched. We intend to scrap it now. If anybody wants to have > some spare parts or even the complete beast, let me know within 1-2 > months. > I regret to say, that this was the last SGI machine we have here. > > Anyway, I would like to express my thanks to the SGI admin comunity > for all the help I've received in past years. > > Sincerely yours, > Cyril F. Hey, Prague - we have relatives there! Unfortunately the machine seems to be a bit too big to fit into a Volkswagen Golf Variant, else we could have offered to rescue it on our next visit there. If somebody feels like it's road trip time for this baby and an appointment can be made, I'm volunteering as a loading and handling assistant! There are stacks of testimonials from satisfied customers ;-) So long, Arno -- Arno Kletzander Student Assistant // Studentische Hilfskraft Informatik Sammlung Erlangen www.iser.uni-erlangen.de Psst! Geheimtipp: Online Games kostenlos spielen bei den GMX Free Games! http://games.entertainment.gmx.net/de/entertainment/games/free

18 years

DM8552

by aek＠bitsavers.org

http://bitsavers.org/pdf/national/_dataSheets/DM8552.pdf

18 years

DM8552

by aek＠bitsavers.org

> Someone on the list could go to Halted, get a copy, and scan it for him. I scanned the entire data book last week. I'll see about getting it on line.

18 years

Compaq Portable 1 for sale - between Boise and San Diego

by tosteve＠yahoo.com

Contact Joe if interested: lather222 at hotmail.com Original Compaq Portable I for sale for $??.??. It boots to green cursor, but no floppies available to verify. Joe is in Boise Idaho, but will be DRIVING to San Diego and Los Angeles area via Las Vegas in early June. Price unknown, but around $50 probably acceptable. Contact him if interested: lather222 at hotmail.com __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

18 years

Help with ICL power supply fault (Farnell SMPS)

by john_a_s2004＠hotmail.com

Hi, I've started to setch the output circuitry, not 100% accutarely as my meter shows all the transformer windings as 0 ohm, so I have some points that measure 0 ohm to ground which may be ground or maybe a transformer output. Thanks Tony for your reply, quote below. Tony wrote: >John wrote> >> I have an ICL PC2 CP/M box (like this: >> http://www.old-computers.com/museum/computer.asp?c=752) which has a >> faulty PSU, I am hoping someone here can advise me. >> >> The PSU is a Farnell N100/F4190 SMPS, looks like a high quality unit >> with nice screw terminals for mains in and DC out. >> > When fired up with 240V AC and a dummy load the output voltages are: >> >> 12V output=1.1V >> 5V output=2.3V >> -12V output=-5.9V > >The first thing that 'bothers' me is that the 12V output is lower than >the 5V one. If this was a simple regulation fault, I'd expect all outputs >to track. > >Do you know which output the crowbar operates on (not which one triggers >it, but which one it shorts out?). Now I have some of the output circuit, I have found their is an SCR (2N6400) connected as follows: Anode - to +12V output Cathode - to ground Gate - to a resistor divider, which inturn is connected via a diode (assumed to be a zenner) to the +5V output. With the power off I have tried applying +5V to the +12V output, and this drew 250mA - ie around 20 ohm. most of this current turned out to be going through the SCR, as when I removed the SCR the current reduced to around 20mA. I think the SCR has been damaged, it is showing 80ohm between gate and cathode with the meter either way round (I think this should be a diode!). I guess the SCR must have taken the brut of the 80W or so of excess power taken by the PSU when I was testing it earlier. I'll buy a couple of replacements. > It's not uncommon for that to be >something other than the main output (simply becuase it's easier to pull >down), it's possible there's a crowbar thryistor on the 12V output, and >that that's firing. Exactly right - thanks for the tip. >I assume this thing doesn't have external sense inoputs for the main >output, or if it dows you've conencted them to said output. No sense inputs. >I think it's reasonable to asusme the chopper is working (otherwise you'd >get no outputs at all). Does it seem to be running continuously, or do >you get the 'tweet tweet tweet' of a PSU that's starting, detecting a >fault, shutting down, and repearing? > >Are tyhe otuptus steady at those votlages? I find an analogue meter best >for this, you can see the needle twitch if the PSU is starting and >shutting down. When I tested it earlier I applied power for around 5 seconds at a time, outut voltages were fairly stable. Next thing I'll look at is the feedback circuit from the +5V output via some resistors and what might be a FET into an opto-isolator to a circuit on the hot side involving a compartor, transistors, resistors and diodes. This looks fairly complicated (to me, probably a piece of cake for Tony!). Pity there isn't a nice IC controller like on the HP-85 PSU :-) Regards, John _________________________________________________________________ Get Hotmail on your mobile. Text MSN to 63463 now! http://mobile.uk.msn.com/pc/mail.aspx

18 years

Seeking Xceed Color30 card

by trag＠io.com

> Date: Thu, 10 Apr 2008 10:16:50 -0400 > From: "Curtis H. Wilbar Jr." <rescue at hawkmountain.net> > David Griffith wrote: >> I'm trying to find a Micron Xceed Color30 card and Greyscale30 card for >> a >> Mac SE/30. > If anyone finds a stash of these... count me in :-) Heh. Typically, $300 - $500 on the rare occasions when they do show up on Ebay. I want one too...but not that much. I don't remember the exact URL, but google on Gamba SE/30 to get to a page with much discussion about this card. There are also a number of threads about it in the forums at 68kmla.net (68K Macintosh Liberation Army; rescuers of old, abandoned and unwanted 68K based Macintoshes). Some other discussion at applefritter.com's forums. The book the poster on the other related thread is probably thinking about is Larry Pina's "Macintosh Repair and Upgrade Secrets", which Tony probably disapproves of. :-) Pina discusses and recommends replacement of components based on the items which, in his experience, most often lead to certain symptoms. He does not discuss doing an actual probe and diagnosis to determine the failed component, which is why I good naturedly refer to Tony's disapproval. There are a couple of later variants on the above book, such as "Macintosh II Repair and Upgrade Secrets", "Mac Classic and SE: Repair and Upgrade Secrets", etc. These sometimes go for ridiculous sums on Ebay as well, but are often available at Amazon or other used book sites for very reasonable prices. At the moment "The Dead Mac Scrolls" are starting at over $100 on Amazon, but if the past is a guide, it will show up for under $20 if you wait around a while. Jeff Walther

18 years

RL01/02 vs. RK06/07 terminators?

by mcguire＠neurotica.com

My dusty memory tells me that RL01/02 terminators are different >from RK06/07 terminators. Can anyone here confirm? Thanks, -Dave -- Dave McGuire Port Charlotte, FL

18 years

HP Portable Vectra CS Model 20

by charlene＠dontmissyourlife.com

Via Google, I just found a two-year-old post of yours (http://www.classiccmp.org/pipermail/cctalk/2005-December/208439.html), which was in response to a four-years'-previous post about an HP Portable Vectra. You said you collect them. Well, I just unearthed my old one from the back of a closet. Interested in buying it? I see one listed on e-Bay for $499.99 OBO. I'm certainly not looking for that much! Charlene

18 years

Help Wanted Picking Items from NASA

by rdawson16＠hotmail.com

Manned Maneuvering Unit, the 'rocket backpack' - the first machine man flew untethered in space. http://www.lockheedmartin.com/aboutus/history/MannedManeuveringUnit.html Randy > To: cctalk at classiccmp.org > From: legalize at xmission.com > Date: Thu, 10 Apr 2008 00:54:20 -0600 > Subject: Re: Help Wanted Picking Items from NASA > > > In article <BLU145-W335578ED914932815E5125BAEC0 at phx.gbl>, > Randy Dawson <rdawson16 at hotmail.com> writes: > > > GO PICK UP THE MMU > > For those of us not infected by TLA-itis, what's MMU? > -- > "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download > <http://www.xmission.com/~legalize/book/download/index.html> > > Legalize Adulthood! <http://blogs.xmission.com/legalize/> _________________________________________________________________ Going green? See the top 12 foods to eat organic. http://green.msn.com/galleries/photos/photos.aspx?gid=164&ocid=T003MSN51N16…

18 years

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test-drb