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101090 discussions

by cclist＠sydex.com

A customer called and says she's got a working Kaypro 10 (and maybe two) looking for a good home. She's in the Richmond, VA area. If interested, drop me a line and I'll furnish contact information. Cheers, Chuck

19 years, 11 months

Was anyone else at HOPE this weekend?

by evan＠snarc.net

We had a nice booth for MARCH on the first floor of the conference, manned by myself, Bill Degnan, Bill Sudbrink, and Sridhar Ayengar. We met LOTS of cool people and lots of people who are collectors but they just didn't know it yet. :) Were any other classiccmp'ers there?

19 years, 11 months

Philips/Magnavox "Odyssey" home gaming system/computer BOXES

by wpileggi＠juno.com

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19 years, 11 months

Fluke 87 calibration?

by technobug＠comcast.net

On Fri, 21 Jul 2006 04:19:36 -0400 (EDT), der Mouse <mouse at Rodents.Montreal.QC.CA> wrote: > Thanks to my sister's bf's generosity, I am now the proud owner of a > Fluke 87 "TRUE RMS MULTIMETER". > > However, I am told it needs recalibration (this is why he gave it > away). [...hack...] The manual is on the Fluke web site and includes calibration procedures. However, Fluke has a van that tours all the major cities and provides a cal check for any meter you bring in. Yearly I help a friend tote all his toys down and have them tested - it's free! Check with your local Fluke distributor and see if you are so blessed. CRC

19 years, 11 months

After you get the HP-UX disks (or before...)

by compoobah＠valleyimplants.com

Go to https://h20293.www2.hp.com/portal/swdepot/try.do?productNumber=B9088AC so it's all nice and legal.

19 years, 11 months

(no subject)

by compoobah＠valleyimplants.com

>no grounded track immediately available, so I'm running the leads across the two channel N outputs. >also tried to chassis/earth ground, didn't make a difference . . . That doesn't make much sense. The scope is across the PSU Channel 4 (-5V) outputs (labeled + and -, I'm pretty sure they are GND and -5V in that order)

19 years, 11 months

Overland Data 3210 parallel port interface?

by cclist＠sydex.com

I've got an OD3210 9-track drive that's been sitting around here for a couple of years. I note that it has a Pertec interface (seems to work) and a parallel port interface. I'm curious about the latter. It appears to be 4-bit each direction, but I don't have a clue as to the protocol or command set. Does anyone have a driver or information about the Overland parallel port interface? Thanks, Chuck

19 years, 11 months

3.5" DSDD disks mostly bad

by dgriffi＠cs.csubak.edu

If anyone wants 3.5" DSDD disks from me, I'm all out. That lot that I posted about last week is mostly bad judging from the sixty I've gone through so far. With 200 to go, I'll just chuck this mess out unless someone here wants to do something silly like make a suit of armour out of floppies. If that's the case, I'll sell the whole lot for the cost of shipping. -- 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?

19 years, 11 months

still having capacitor problems in the IRIS PSU

by compoobah＠valleyimplants.com

I'm starting to get a bit peeved - I've tried randomly throwing capacitors across the output, scientifically choosing a capacitor to have a reactance of 1 ohm at the trouble frequency, and taking that cap and putting another .022?f unit in parallel - and the noise doesn't get attenuated at all, it's still at around 500mV, in high audio frequencies. If it was going down (to ~300 mV) I'd just build a LC choke filter and be done with it, but its stubborn spurning of something that should work is bothering me. Is the ripple carrying that much current that the resistance of the capacitor is an issue? I don't think so- this is a secondary supply (-5V!). I also don't get why there should be a relatively equal AC component in 3 secondary supplies that do share much after the transformer primary, and yet a low level in the main +5V. Could this be something bizarre in the connection of the scope? I'm doing a very bodged scope -> BNC cable (one of the bundle that usually runs to the monitor) -> 2 alligator clip leads stuck on to the relevant bits of the other-end BNC connector. Been trying to work out this board. It's one daughtercard in the PSU, the chopper transisors are on another. Yet, there are 3 TO-3 cased bipolar (2Nxxx parts) scattered amongst the rectifier diodes. Similar units are not present in the +5V channel. Would this have linear regulators on the non-main channels?

19 years, 11 months

Looking For Tandy PC-2 / Sharp PC-1500

by jcwren＠jcwren.com

I've got a friend who was reminiscing his old days in computing, and was thinking he'd like to have his old Tandy PC-2 again. Does anyone have one they're looking to part with (a Sharp PC-1500 would also suffice)? I'd like one that's cosmetically clean, has the cassette/plotter base and manuals. If you have one you're looking to part with, please contact me off-list at jcwren at jcwren.com --jc

19 years, 11 months

still having capacitor problems in the IRIS PSU

by compoobah＠valleyimplants.com

> Forgive a stupid question, Scott--are you taking your ground return for >your scope from the metal chassis or from a grounded track on the PCB? >They might not be the same thing. no grounded track immediately available, so I'm running the leads across the two channel N outputs. also tried to chassis/earth ground, didn't make a difference . . .

19 years, 11 months

IC pin corrosion

by Billy.Pettit＠wdc.com

Tony Duell wrote: UK TVs (even back in the 405 line era) tend to use a 75 ohm coaxial aerial cable (not a flat twin 300 ohm one that's popular in the States). This cable often had an air-spaced insulator between the centre core and the braind, and thus there were channels the full length of the cable. The aerial terminal box had developed a water leak. Rain came in there, ran down the channels in the cable (not down the outside), then came out inside the coaxial plug at the back of the set and ended up on the floor. Of course this messed up the properties of the cable, hence a weak signal and a poor picture. -tony Nice tale and after seeing some of those old coaxials, easy to believe it must have happened more than once. Reminds me of one of my worst memories on the big iron systems. Had a computer that was on the top floor. The building maintenance people were running the grounding cable on the lightning rod down to the earth rod.. And discovered this wonderful cable channel that carried the power from the basement MGs up to the main frame power supplies. The inevitable happened and a lightning bolt took out all the supplies on the entire system. The overvoltage crowbars saved most of the logic. But the lightning literally vaporized the power cables, and the MG was a big piece of toast. Nobody was punished - the union said that there were no guidelines stating this was a bad thing. And common sense seems to be a rare commodity. Billy

19 years, 11 months

VMS program to read/write simh .tap container files?

by bob＠jfcl.com

>At least TPC files are slightly more portable than some formats (RSX-11M+ >Virtual Tape comes to mind). Now if only there were some magic to keep a TK50/TK70/TZ30 drive working for more than ten minutes. And by "working", I mean anything that doesn't require disassembly of the drive and the computer to free a jammed tape. Actually reading the bits is more than I could hope for :-) Bob

19 years, 11 months

DLT and TKxx drives (was Re: VMS program to read/write simh .tap container files?)

by ethan.dicks＠gmail.com

On 7/22/06, Robert Armstrong <bob at jfcl.com> wrote: > Now if only there were some magic to keep a TK50/TK70/TZ30 drive working > for more than ten minutes. Speaking of the drives, I have a small Perl program that will emit the right PostScript to directly print lines of text on the label inserts. Free if anyone wants it. I was tired of handwritten cardboard labels and misaligned laserprinted Avery sticky labels. -ethan

19 years, 11 months

ISO Ultrix 4.x CD images

by aek＠bitsavers.org

Someone I know is working on a DECstation simulation, and is looking for Ultrix to test on it. Anyone have images of the distr discs? Also, FWIW, I found someone who has a simulated 5xxx and O2 running http://gavare.se/gxemul

19 years, 11 months

MSD SD-2 Service Manual

by starmaster＠gmail.com

And thusly were the wise words spake by Star Master > > Does anyone know where I can get an MSD SD-2 Service Manual? I'm willing to > pay an indivual or a company (Can't find one that has it). > Thanks This has the schematics and user manual: http://staff.washington.edu/rrcc/uwweb/MSD-SD2/ Cheers, Bryan Thanks Bryan, I already found those...However I need the service and or diagnostic info for it. When I turn it on all the lights turn on and stay on, and it is not seen by the computer. Anyone else? Thanks

19 years, 11 months

VMS program to read/write simh .tap container files?

by aek＠bitsavers.org

> It is usual to bake the tape at a low-temperature owen (a box with foil > paper and an incandescent lamp) to dry the humidity of the tapes. It makes > them less sticky, but PLEASE do not try to re-run the tapes. It is enough to > save the contents, but not always make tapes useable again > > This is an old tip from recording studios... Bertram and Cuddihy "Humid Aging of Magnetic Recording Tape" IEEE Transactions On Magnetics Sep 1982 Has a detailed analysis of the failure mechanism in the binder, along with some temperature/humidity curves that show the rate at which the binder can be rejuvenated. I just bought a Toyo Living controlled humidity chamber this past week to begin the exact characterization of the temperature and humidity protocol required to process 1/2 tapes so that they can be read safely. The whole "baking tapes" process has way too much black magic involved, and I have tapes at the Museum that I have to read that are irreplaceable (and VERY old) so I don't have the option of just throwing them onto a drive and see if they start to squeel. After that is dealing with DC-300's and DC-100's that I've observed with exactly the same sticking problems. Fortunately, the Museum has very few TK50s

19 years, 11 months

VMS program to read/write simh .tap container files?

by aek＠bitsavers.org

> Now if only there were some magic to keep a TK50/TK70/TZ30 drive working > for more than ten minutes. Ten minutes sounds about the right length of time for the first traversal of the tape, at which time the collected sticky crud from most old tapes is deposited at the end of the track when it reverses direction, and then proceeds to stick the tape to the head. I don't know if the formulation of the tapes is such that you can remove the stickiness with heat/dehydration. This is also something I need to try on DC-300 carts that have become sticky. You also need to THOUROUGHLY clean the head stack. I have a TZ30 that I leave partially disasembled so I can pull the stack out the top so it can be cleaned with isopropyl on a cotton swab. -- It's probably time to put together lists of what TK50s (distr at least..) have already been read to save others the grief of dealing with old sticky media.

19 years, 11 months

Rotec industry PC

by ying6926＠ureach.com

Hi I am looking for Rotec Gamma 4 industry PC. I wonder if anyone has any information. thanks Henry

19 years, 11 months

OT: Electricians was Re: IC pin corrosion

by compoobah＠valleyimplants.com

> And then there was the attempt when wiring up an outside light where the kid >decided to hook both wires from the light and both wires from the feed up to >the switch. Turned the breaker back on and the light was on all the time, >until he flipped the switch, which popped the breaker, because he had it >going _across the line_. Unorthodox, but it does work . . . I know for a fact that Silicon Graphics used a similar system on some machines (Twin Tower, possibly others) to shut down the power supply if sufficient bits were removed to impede cooling. Not sure if it was the same designer . . .

19 years, 11 months

Looking for some HP LJ3 repair hints and a paper tray

by philpem＠dsl.pipex.com

Hi, I've got a Laserjet III that's intermittently throwing Service 50 errors. Fusing lamp tests good as per <http://www.fixyourownprinter.com/reference/guides/fuser/sx>. I assume this means the AC power module has fried itself. Best I can find on Google is that I need to replace the triac and some 'support components'. I can find component designator IDs, but not component values - does anyone know what needs replacing, and what to replace it with? It's also been throwing 13 Paper Jam errors, but there's no paper jam visible. Anyone know what causes this? I'm guessing the optosensor on the fuser assembly has failed, but I can't identify the opto. Does anyone have a part number for it? Finally, if by some twist of fate I manage to get this thing running, I'm going to need an A4 paper tray. Anyone in the UK got a spare they feel like parting with? Thanks. -- Phil. | Kitsune: Acorn RiscPC SA202 64M+6G ViewFinder philpem at dsl.pipex.com | Cheetah: Athlon64 3200+ A8VDeluxeV2 512M+100G http://www.philpem.me.uk/ | Tiger: Toshiba SatPro4600 Celeron700 256M+40G

19 years, 11 months

So how was VCF Midwest?

by evan＠snarc.net

Anyone have a report...?

19 years, 11 months

Pack Inspector

by jwstephens＠msm.umr.edu

I purchased a Computer Link Pack inspector about 2 months ago on Ebay. I just got a junk pack to play with this week (same vendor). It is marked "Master Alignment Pack" and is declassified navy badged. Anyway though people might get a kick out of it. I would love to have a real use for it, but it is just for collection and display purposes. Jim http://jwstephens.com/pack-insp-2006-07-20/page_01.htm

19 years, 11 months

looking for a book suggestion

by JEphraim＠ci.southlake.tx.us

I have several old Apple IIs, a TRS-80 (new in the box), and a few other older computers. I would like to get them all running again, if possible. I have been putting computers together since the late 80s, but have little knowledge of actual computer electronics repair (soldering, replacing broken wires, etc.). I would appreciate any suggestions about good, accurate, thorough books to purchase so that I can start teaching myself the basics. There are a number of such books out there, but I am having difficulty evaluating the accuracy and thoroughness of them. Since this question is probably not of interest to many others on the list, please feel free to email me any suggestions at jephraim at ci.southlake.tx.us Many thanks! Jesse Ephraim Adult Services Librarian Southlake Public Library 1400 Main Street, Suite 130 Southlake, TX 76092 (817) 748-8247 jephraim at ci.southlake.tx.us "A circulating library in a town is as an evergreen tree of diabolical knowledge." - Richard Brinsley Sheridan (1751-1816)

19 years, 11 months

MicroVAX I

by emu＠e-bbes.com

Hi all, anybody out here has the printset for the MicroVAX I (aka KD32) ?

19 years, 11 months

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