test-drb

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101090 discussions

looking for replacement parts - 74S01, 74S73, 2518, 2533

by grant＠stockly.com

At 09:58 PM 4/13/2008, you wrote: >It was recently asserted here that TTL parts aren't hard to find, but >I'm having a heck of a time finding the 74S01 and 74S73. > >As far as I can tell from the data sheets, the 74S103 is functionally >and pin-compatible with the 74S73, but a little faster. I wouldn't mind >substituting that, but it doesn't seem any easier to find. > >The 74S03 and 74S107 are non-pin-compatible replacements for the 74S01 >and 74S73, but I'd much prefer to stick with pin-compatible parts. Unicorn Electronics can get all of those ICs, but you'll have to order a minimum quantity. http://www.unicornelectronics.com/prod.htm

18 years

looking for replacement parts - 74S01, 74S73, 2518, 2533

by eric＠brouhaha.com

It was recently asserted here that TTL parts aren't hard to find, but I'm having a heck of a time finding the 74S01 and 74S73. As far as I can tell from the data sheets, the 74S103 is functionally and pin-compatible with the 74S73, but a little faster. I wouldn't mind substituting that, but it doesn't seem any easier to find. The 74S03 and 74S107 are non-pin-compatible replacements for the 74S01 and 74S73, but I'd much prefer to stick with pin-compatible parts. I'm also looking for the 2518 and 2533 shift registers. The 2518 is a hex 32-bit static shift register, and the 2533 is a 1024-bit static (not dynamic!) shift register. The original parts were Signetics, but I don't mind using other sources: Signetics 2518 2533 TI TMS3122 TMS3133 Fairchild 3349 3533 National - MM5058 GI - 2533 AMD - Am2833 Eric

18 years

modern switching power supply faults

by rescue＠hawkmountain.net

I have two Dell switchers out of P4 based 1U servers. The first one has a failure in the startup circuit... pressing the power button will lead to a flash of the power light... and that's it. The second one failed spectacularly.... There is a wire wound power resistor (5W15RJ) near the AC input... it cooked... and I do mean cooked. It came out in pieces (with almost no effort), melted the nearby capacitor and a nearby relay. It also did a pretty good job of puckering/burning the PCB (but not bad enough it could not be used). I suspected maybe shorted primary full wave rectifier... but I used the DVM on diode test and got what I'd expect. Oddly, despite there being a fuse on the primary side... it's still good... it wasn't taken out. That resistor got hot hot hot. Could that resistor have failed on it's own ? I suspect something further down the circuit must have a problem. I'd be happy if I could make one power supply out of the two. These are not simple supplies however. While much of the switching transistors, regulators, bridge rectifiers, capacitors and the usual fair in a switcher are pretty readily identified, there is a 6" x 1" "brain" board (I'll call it that as it has adjustment pots, the ps fan circuit, quite a # of surface mount components on both side of it, and it interfaces with the main PCB with 34 connections. These are Dell W5916 supplies. Unsure who really makes these for Dell, only other marking is Model: HP-U280EF3. Both these supplies had been cycled 4 times on/off the mains due to a power failure (power fail, generator cycled on, power restored, generator cycled off, repeat process one more time) within a few minutes of each other. The first one was dead immediately after this (the one that has a problem in the start circuit (or a monitor/etc is shutting it down when it detects a problem during turn on). The second one failed almost two weeks after. I know this isn't particularly classic... but I know that there are those out there much wiser than me in switchmode power supplies. So lets pretend it is 2014 that way the supplies will be 10 years old :-).... -- Curt

18 years

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

by bob＠jfcl.com

I have this 11/23+ system with an RL02 drive and the RLV12 controller that won't boot XXDP. Attempting to boot XXDP v2.5 either halts at 000154 during the initial boot, or gives ?RD ERR messages from XXDP. The behavior is a little random - sometimes it halts at 154, sometimes you'll get a few ?RD ERRs and then it'll lock up, and sometimes you'll get far enough to get an actual prompt from the XXDP monitor, but even then you can't run anything. You just get more RD ERRs. OK, I know - bad drive or bad pack, right? Well, I've tried two different RL02 drives and two different XXDP packs with the same results. Better yet, I've connected one of those RL02 drives to another -11 (this time a 11/04 w/RL11) and that same drive with those same packs boots and runs with no complaints. The drive even passes all the ZRL??? diagnostics and ZRLM?? can scan the entire pack and finds no bad sectors. Better yet, I have another RL02 pack with RSX-11M v3.5 and that boots and runs on the 11/23 with the same RL02 and RLV12 with no apparent problems. Now that's really impossible - the same drive that won't boot XXDP will boot RSX? How can this be? It almost seems like it has to be a software problem with XXDP, but XXDP obviously works on a 11/23 and the RLV12/RL02. Is there some strange hardware compatibility or ECO issue with the RLV12 or the 11/23+? Is there something XXDP does with the drive that RSX doesn't? I'd run diagnostics on the RL subsystem, but I don't really have any other load path for XXDP on this system. I did pare the system down until there are only three cards in the backplane - CPU, memory and RLV12. No joy. And just on a whim I tried a different cable for the RL02 - still no joy. Thanks much, Bob Armstrong

18 years

Mac Plus ozone?

by cclist＠sydex.com

Date: Sun, 13 Apr 2008 09:32:36 -0400 > From: "Curtis H. Wilbar Jr." I believe the proper name for the water-based colloidal graphite suspension used to coat CRT surfaces is "aquadag". "Dag" is probably just a shortened form. Aquadag paint for repair should still be available. Some old HOTs (horizontal output transformers/flyback transformer) in CRT HV supplies develop cracks in the potting material with age and sometimes expose the connection of the winding to the HV anode lead. This can cause a corona discharge and the ozone smell. There can also be arcing from the HV lead to the chassis. A lights-out inspection will sometimes yield the telltale purple glow of corona discharge. Often, the discharge can be heard by young ears as a "hissing" sound. Good old red glyptal HV dope is the most commonly prescribed cure for insulation failures. I think GC still sells the stuff. Cheers, Chuck

18 years

Bay Area collection viewing?

by wdonzelli＠gmail.com

Once again, this year I will be in the Bay Area for a few days, basically most of the week of the 4th of May. In the past, a couple of computer collectors opened their doors to me and did a show and tell. Once again, thank you much. So, does anyone else want to show of their machines to an East Coast weenie? Remember, bigger is better. Microcomputers are only shims for real computers. Computers with big blue skins are extra cool. Old is good. Let me know as soon as possible. I will have some email access as I cross the country, but I always like to have things planned out before I leave my driveway. -- Will

18 years

govliq: HP-1000 (Mechanicsburg, PA)

by legalize＠xmission.com

<http://cgi.govliquidation.com/auction/view?id=1675504&convertTo=USD> Buried in a giant lot of other stuff, 17 pallets, 7000 lbs. -- "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/>

18 years

pcmcia gpib on govliquidation

by Tim＠Rikers.org

Is there any way to contact those who win an auction on govliquidation? If I read this right, this auction includes approximately 24 pcmcia GB-IP interface cards and cables: http://cgi.govliquidation.com/auction/view?id=1654940 It also includes a ton of other things I don't want. I'd love to get my hands on 2 of those pcmcia card+cables. I don't want to even consider shipping the rest of the lot from Mechanicsburg, PA though. -- Tim Riker - http://Rikers.org/ - TimR at Debian.org Embedded Linux Technologist - http://eLinux.org/ BZFlag maintainer - http://BZFlag.org/ - for fun! ????????u poo? ??n??u??s ?no? u? 8-??n ?u???? s?

18 years

Help with ICL power supply fault (Farnell SMPS)

by john_a_s2004＠hotmail.com

Hi, 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 other worrying thing is it is also drawing 100W power (measured with a one of those plug in mains meters from Maplin), whilst the dummy load is around 20W (split between +12V and +5V). I've checked all the capacitors with multimeter and ESR meter, and all seem fine, and none are bulging or obviously overheating, DC resistance on each of the output connections to ground is around 60 ohm. I couldn't find a short so I don't know where all the power is going to, I suspect there is some protection circuit kicking in? I don't have a circuit diagram, so my first plea does any one have one please? The circuit has few ICs, and mostly transistors. There is a CA339E quad comparator chip, and a IL201 opto isolator (I'll try and check these), but no nice single IC controller. My current strategy is to apply +5V to the comparator chip and apply voltages to the output to try and see some feedback, and also apply 50V DC to the input in the hope this is enough to start up the oscillator (I think this is a small group of transistors, resistors and small capacitors near a small torial transformer, which then feeds to the main conversion transformer). Any suggestions gratefully received, Thanks, John _________________________________________________________________ Get Hotmail on your mobile. Text MSN to 63463 now! http://mobile.uk.msn.com/pc/mail.aspx

18 years

Mac Plus ozone?

by rescue＠hawkmountain.net

I was given a Mac Plus a while back... and never tested it.... Decided to give it a quick test... Other than needing a boot floppy which I'll have to dig up.... it powers on, video looks good, monitor is stable and all... But there is a faint sound (think of it as a cross between crickets chirping and clicks) and after a while, it smells to me a bit like ozone at the top of the Mac. I'm thinking maybe high voltage leakage ? Anyone have any experiences with these old Macs that can point me at what to look for ? It might well be OK as it is... but I don't want to risk damage occuring as other than a few dings and scrapes and a bit of yellowing, it is in remarkable condition. -- Curt

18 years

Zenith Z100 user manual with winchester supplement

by dgriffi＠cs.csubak.edu

I have a Zenith Z100 user manual (with some pages still in shrinkwrap) and a winchester supplement that I've run on Ebay a couple times. Is anyone here who's not on speaking terms with Ebay who'd like this? -- 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

PDP-8/E

by RodSmallwood＠mail.ediconsulting.co.uk

Hi Could anyone out there with an 8/e confirm the following: 1. Knob set to STATE, SR Keys Down 2. Press ADDR LOAD - do MD DIR and DATA CONT light up? 3. Press EXAM - do MD DIR and DATA CONT light up? 4 Raise DEP - do MD DIR and DATA CONT light up? Rod Smallwood

18 years

Bringing up an older Mac

by mtapley＠swri.edu

At 12:00 -0500 4/10/08, David Griffith wrote: >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? I had a long, long series of problems with my Mac Plus. They got pretty much cured when I took loose the power cable connecting the Analog/video board to the digital board, cleaned the pins (sanded lightly and wiped with ethanol), and put some silicone oil spray on to inhibit corrosion. I had previously done this at the digital board end, but the resistance (ohms to tens of ohms, and variable, responding to temperature and vibration) was at the analog board end. I finally discovered I could diagnose these by using an ohmmeter between the solder pads on the back sides of the boards at either end of the cable. I don't know how many differences there are between SE/30 and Plus, but some, for sure. Be very careful disconnecting at the analog board end of the cable - pull too hard, and your hand can smack into the thin end of the CRT, letting the vacuum out. I have a .pdf of the Apple Service Manual for the SE/30, which I'll be happy to forward (off-list, obviously). On the Plus, there are also a set of variable resistors on the analog board setting various parameters (width, height, etc.) of the video. Those might also be corroded. Running them back and forth and then back to the original settings might clear that, or some contact cleaner (which is probably a better treatment for the connectors than what I list above) might be a good idea. Finally, capacitors on the analog board might be going bad. An ESR meter could give you some indications there. Additional clues from somebody with an SE/30 would be very valuable! At 12:00 -0500 4/10/08, Ian Primus wrote: >But I have a >book at home, forget the name, but it's a Macintosh >repair guide that has a lot of good info to help >pinpoint failed parts. It has a purple cover. Anyone >remember this book? This is going to drive me nuts all >day. :) The "Dead Mac Scrolls"? "Macintosh Repair and Upgrade Secrets"? Google for Larry Pina, I think he's the most-recognized author in this area. At 12:00 -0500 4/10/08, David Griffith wrote: >It happens perhaps once every ten seconds. The disturbance is something >like a ripple or wave that crawls up the side of the screen. Oh. Probably my advice above is good in general but not specific to this problem. I think the Pina books may well address it though. If Jeff W. is listening, he can probably verify that. -- - Mark, 210-379-4635 ----------------------------------------------------------------------- Large Asteroids headed toward planets inhabited by beings that don't have technology adequate to stop them: Think of it as Evolution in Fast-Forward.

18 years

govliq: HP disk alignment pack (Clearfield, UT)

by legalize＠xmission.com

<http://cgi.govliquidation.com/auction/view?id=1664044&convertTo=USD> If anyone wins this, I can help pick up/ship it for you. -- "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/>

18 years

FS: SGI XZ video for Indy new in box

by rescue＠hawkmountain.net

I have one of these new in the box, only opened for inspection. Has all SGI docuemntation, boot rom, video board, all new in the original massive box (about 20x20x4). If your interested make an offer. I'm only keeping one of my Indy's, and that one already has XZ so I don't need this new one. -- Curt

18 years

Anyone using an Intel AboveBoard MC on a Model 80?

by derschjo＠msu.edu

Title says it all... I picked up a "new" (still in shrink-wrap) AboveBoard MC with the intent of using it in my PS/2 model 80 and I'm having serious issues getting it to function properly. The Model 80 has 4mb of planar memory installed, and I've been running it with no issues with an Orchid Ramquest 8/32 stocked with 8mb of memory (so 12mb total). In an attempt to get a little more memory, I've tried running with the Orchid replaced by the AboveBoard... The AboveBoard came with 4mb installed (4 1mb simms) which I initially replaced with 32mb (8 4mb simms, known good). I've since tried running with the original RAM, as well as other RAM I have lying around, without any success. I've tried running in different slots (both 32 and 16 bit) with no change. I've also adjusted the ram speed in the configuration page (options are 100ns or 80/85ns) with no change, though it seems slightly happier with 80/85ns selected. The behavior is very random -- sometimes the startup memory count (which is separate from the memory count in the PS/2's BIOS) fails to count all the memory -- on these occasions you can see it "pause" slightly during the count as if it's hitting bad memory and skipping over it. Sometimes it counts all the memory just fine. Regardless, the OS crashes or panics (tried NT & Debian Linux, haven't tried OS/2 yet) eventually. I've run memtest86 on it and what I find is that if the memory count is successful, memtest reports no errors, but attempts to run actual OSes crash after awhile. I've read that the Model 80 has trouble (not sure precisely /what/ trouble) with more than 16mb of memory, but even limiting the AboveBoard to 4mb is problematic. Anyone have any ideas? Similar/different experiences? Thanks, Josh

18 years

The history of the double sided floppy given under oath

by aek＠bitsavers.org

The problems with SA850's eating media was well known at the time, as well as the switch to a bicompliant head. If anyone cares, there are still folks around the Valley that worked on the problem. Apple got around the problem with by putting the heads on opposite ends of the media on the Twiggy, but it had other well-known problems.

18 years

The history of the double sided floppy given under oath

by swtpc6800＠comcast.net

Here is some interesting history on the development of the double sided floppy drive. I Googled for - shugart sa450 1976 Start reading around page 170 In the Matter of "Certain Double-Sided Floppy Disk Drives and Components Thereof" Investigation No. 337-TA-215 USITC Publication 1860 May 1986 United States International Trade Commission, Washington DC Michael Holley www.swtpc.com/mholley

18 years

Seeking Xceed Color30 card

by trag＠io.com

>Date: Fri, 11 Apr 2008 21:11:07 +0100 >From: "Liam Proven" <lproven at gmail.com> >> >> I'm trying to find a Micron Xceed Color30 card and Greyscale30 card for a >> Mac SE/30. >It /is/ possible to clone one - q.v. > >http://home.earthlink.net/~gamba2/microngray.html Actually, that project was just to clone the Grayscale adapter card. It did not include the frame buffer main card. The main card was based on a custom chip by Micron--not an FPGA unfortunately. So the chances of cloning it without having to redesign the bulk of the logic is nill. Now, it really shouldn't be that hard to whip something up with an FPGA and either some fastish SRAM or an open core DDR2 controller and one DDR2 memory chip. However, figuring out all the ins and outs of properly interfacing to the Mac OS of the time has had me slowed and stopped for a while. It's probably not all that difficult, but it is tedious and there is a lot of information to sort through. One of the hardest parts is knowing which information I actually need. For every useful tidbit I find, I've gone through 20 chunks of old Mac knowledge which don't apply but were in the way. Jeff Walther

18 years

a printer oddity

by rtellason＠verizon.net

Some of you may already be aware that I have a whole pile of dot-matrix printers kicking around (http://mysite.verizon.net/rtellason/w4s.html has a list of them on there), and in moving some of them yesterday I noticed some rather odd things about one of them. It's an Okidata 391, one of the few that are wide-carriage, and it's 24-pin as well. Where before I'd had most of them facing front-outwards I now have this one sitting there with the rear facing where I can see it, and have noticed a couple of odd things: First is that right next to the usual parallel connection there's another connector, a DB25. That bit seems to be a little loose, and I'm thinking plug-in board maybe? Something's not quite right. Anyhow, I was wondering if this was a serial interface adapter, and if it might be usable in any of the other units I have on hand as well. I have, unfortunately, no documentation on any of these at the present time. The other thing is that attached to that connector is a little adapter, which has an RJ-45 socket on the back side of it. The plug side of it has only a small number of the 25 pins actually installed. If I can figure out a way to pop the shell open maybe I'll trace it out, otherwise I'll probably take the ohmmeter approach. :-) Was it at all common to use these for serial connections? Anybody have docs on those 300-series Okidata printers? -- 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

PDP11/23+, Kennedy 9000, RX02, hard drive for trade

by hardware＠ees1s0.engr.ccny.cuny.edu

Dear cctalk people, We have here three PDP11/23+ machines. One might have had the CPU upgraded. There is also a Kennedy 9000 tape drive. A compatible hard drive is included that supposedly works and supposedly contains RT-11. Also included is a RX02 floppy drive, also supposedly working. The previous owner said that everything was working when it was cleanly shut down several years ago. My interest has shifted more toward analog electronics, particularly old Tektronix stuff, scopes, plugins, etc. If anybody wants to do some kind of trade, that's great. Needless to say, this stuff is heavy, so local pickup is probaly the only practical way. I am in New York City. -kurt

18 years

FS/T: SGI IRIS 4D Boards

by silent700＠gmail.com

My attempt to give away my Iris non-op 4D310/VGX was unsuccessful (although that offer still stands for local pickup in 60074,) so now I'd like to find the individual boards a home. I don't believe there is anything special here - CPU board, RAM board, VGX 3-layer video (with 2 sets of BNCs on panel headers.) I'll take any nominal price for them (seriously - $1 + shipping would do it if you can make use of them) or would be happy to trade for pretty much anything. Don't let these lovely boards meet the dumpster!

18 years

360/30 Console Display in Auckland, NZ

by ljw-cctech＠ljw.me.uk

After many, many years part of the 360/30 has surfaced in the form of the console on display at the University of Auckland Computer Science department. If you follow the link in my signature, you can find a photo of the console display. Of course you will notice it's missing the proper central two-piece knob, so if anyone knows were we can get one then let me know. Thanks to Bob Doran (one of my lecturers way back then) who organised this. If anyone's in Auckland you may want to go and visit it! (As far as I know it's at the City campus, so only a couple of minutes walk from Queen Street.) While you're in Auckland you should also visit MOTAT and see the /40 and other goodies there. -- Lawrence Wilkinson lawrence at ljw.me.uk The IBM 360/30 page http://www.ljw.me.uk/ibm360

18 years

PDP-8/E

by djg＠pdp8online.com

> Could anyone out there with an 8/e confirm the following: > > 1. Knob set to STATE, SR Keys Down > 2. Press ADDR LOAD - do MD DIR and DATA CONT light up? > DATA comes on. If DIR is off it will come on > 3. Press EXAM - do MD DIR and DATA CONT light up? > DATA comes on. If DIR is off it will come on > 4 Raise DEP - do MD DIR and DATA CONT light up? > No change in those lights Not quite sure what is up with DIR. On my online PDP-8 it seems to always be on. The web front panel seems to be working fine (http://www.pdp8.net/run.shtml) which should act the same as the real front panel. I tried to verify with the real front panel but its not operating reliabily. I tried the 8/M and it acted the same except sometimes when I did things on the front panel DIR would change state but not in any obvious pattern. If it was off the ADDR LOAD and EXAM would make it turn on while the switch was held. Looks like more things for the todo list.

18 years

a printer oddity

by tiggerlasv＠aim.com

Most of the Okidatas from the period (Microline 320, 520, etc.) had a standard Parallel port built in on the back of the printer. Right next to it is usually a plastic knockout. If you get the RS232 serial port option for this printer, you remove the plastic knockout, and slide the RS232 board into the opening. There is a card-edge connector that it mates with. You don't have to set any switches to use it. I don't really know if it will let you do "dual porting" or not. (i.e., 2 computers printing to it, one via serial, one via parallel.) As for the RJ45 adapter; those are fairly common. The serial port probably only needs 3 pins for printing, Ground, TXD, and RXD . . (7, 2, and 3), although they may have included handshaking signals. Who knows. A standard serial cable to/from your computer should work, as well as a parallel cable. Documentation should be readily downloadable >from the Okidata website. As info. . . . T

18 years

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