test-drb

test-drb@ccmp.vtda.org

101090 discussions

by ard＠p850ug1.demon.co.uk

> > Yes "blipping" the coil with a 9V battery moves the heads. When the drive > was powered on I also measured the voltage by attaching a probe to each end > of the coil cable, in that case I measured about 1.3V only. So I am guessing > the coil is OK. Next step is to swap the boards back again. And then fix the real fault :-) More seriously, it sounds like the positioner coil is not being driven hard enoguh to move the heads -- and if the coil was open-circuit I would ecpect the servo sysem to try to drive it very hard to attempt to get some movement. Normally there are various conditions which have to be satified (motor up to speed, no write current unless write gate is asserted, only one head selected, etc) before the heads will move. It's entirely possible the problem is in one of those areas. -tony

15 years, 11 months

Anyone off to VCF-UK?

by roger.holmes＠microspot.co.uk

On 16 May 2010, at 05:07, cctalk-request at classiccmp.org wrote: > > Message: 3 > Date: Sat, 15 May 2010 20:12:58 +0100 > From: Roger Pugh <rogpugh at mac.com> > Subject: Re: Anyone off to VCF-UK? > To: "General Discussion: On-Topic and Off-Topic Posts" > <cctalk at classiccmp.org> > Message-ID: <4BEEF23A.8050204 at mac.com> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > On 05/15/2010 01:00, Philip Pemberton wrote: >> Hi guys, >> >> Just out of curiosity, is anyone planning to attend the UK Vintage >> Computer Festival this year? The one that's running on the 19th and >> 20th of June at Bletchley Park? > > I intend to go for one of the days, but not sure which. > > Is anyone interested in a car share from the South East? > Possibly, I am roughly equidistant from M20 J8 and J9. Where are you? If I arrange to share a car I won't let apathy reign on the day. My best MPG car is about 23 so maybe not one of mine though my supercharged Daimler V8 is very luxurious, it only does 17 mpg! Roger Holmes.

15 years, 11 months

Mac Classic problems

by mtapley＠swri.edu

All, Got a Mac Classic, swapped non-functional hard drive, installed RAM, nearly got it working for my 10-year-old. But.... First pass, no sound out. Not speaker, not headphone connector. Wait, if you hold your ear right up against it, you hear a *little* bit. Hm. Second pass, a week or so later, won't boot. Hmm. Opened it back up, looked over everything ... what's this? There's some stuff on the digital board. Wonder what could leave an oily stain, and how it got there in the first place without leaving tracks on the inside of the case, the CRT, the disk drives, etc. etc.? Well, won't hurt to clean it off, I thought ... then the penny dropped and I realized that there were *three* little islands of gunge, and they were centered on the three groups of what look like my favorite nemesis .... capacitors! <gnashing of teeth> Many q-tips and much isopropanol later, it boots, but it's still quiet - too quiet - and I have a bad feeling about how long it'll keep running before I have to clean it again. There's a bit of corrosion on one lead of the sound chip, but I can still hear a very very faint edition of the sound it's supposed to make. The Classic has a surface-mount digital board. The components I suspect are metal can devices, lots of them with the same marking (which I neglected to write down) and one different. Each has a tiny flat plastic-looking isolator or something between it and the logic board. 1) Is there a preferred solvent I can squirt under those things and the sound chip that'll pick up capacitor gunge (or whatever it is) better than Isopropanol? Is the old standby dihydrogen monoxide a good bet? (I have plenty of that.) 2) If (sigh. When) I have to pull those things off, I will need a hot-air soldering station, correct? My thought is, cut up an aluminum can to make an air dam isolating the cap. from the rest of the board, then blast it with hot air until it flies off or vaporizes. Is that close to right? 3) How do I get replacements, and how do I slap those back down on the board? Is the code on the top all I need to order more? Hints appreciated. Hm. Come to think, maybe I better double-check that the swapped-out hard drive was really dead. The SCSI port might have been the first casualty of the capacitor scourge. -- - 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.

15 years, 11 months

i8355 from SDK-85 flakey

by tech＠pluscomputers.com

Chris, I have the monitor listing (v 2.1) for the SDK-85 in digital form if it will help. I've modified it to compile with Pseudo Sam by removing the macros. I've added line drivers (75188 and 75189) to my SDK-85 to support RS-232C and changed the code so it runs at 9600 baud. If you can rustle up an 8755 you could burn the monitor to it. Regards, Carl -- Carl Allen Plus! Computers, Inc. (336) 659-8549 tech at pluscomputers.com www.pluscomputers.com --

15 years, 11 months

radio shack 28-249 manual

by holland＠pacbell.net

Hi, Sorry about my first email. It was late and my back was killing me. I would appreciate very much if I could some how get a copy of the manual for my 200 in one project kit. I am 60 yrs of age and disabled and have time on my hands.? I graduated in electronics, head of the class, but I still like basic things... like this kit. ? ??? Sincerely, ????????????????? Bruce Holland

15 years, 11 months

[OT] Space Shuttle and ISS (was Re: Amiga 1000 helps)

by tshoppa＠wmata.com

Al writes: > I've always wanted to give Burt Rutan a run at a Space Shuttle > replacement. I bet he'd do something really nice. > His White Knight/Spaceship One combo seems pretty innovative. But, > that's not intended to be a Shuttle replacement. I actually hope he doesn't do "a Space Shuttle replacement". The Space Shuttle is a classic example of scope creep. It had to do everything. In the end it did do most all of everything, and it did it each of them pretty well, but it was much more complicated than needed for any one task, and schedules and budgets were blown out of the water. But excepting schedules and budgets... it did surprisingly well. What Burt Rutan could do, is a family of replacements, each of which does one of the shuttle's tasks well. Some stages/assemblies/technologies would probably end up being shared and that's great. Tim.

15 years, 11 months

Anyone off to VCF-UK?

by roger.holmes＠microspot.co.uk

On 17 May 2010, at 04:49, cctalk-request at classiccmp.org wrote: > > Message: 15 > Date: Mon, 17 May 2010 00:00:19 +0100 > From: Roger Pugh <rogpugh at mac.com> > Subject: > To: "General Discussion: On-Topic and Off-Topic Posts" > <cctalk at classiccmp.org> > Message-ID: <4BF07903.2000805 at mac.com> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > >> Possibly, I am roughly equidistant from M20 J8 and J9. Where are you? >> >> If I arrange to share a car I won't let apathy reign on the day. >> >> My best MPG car is about 23 so maybe not one of mine though my supercharged Daimler V8 is very luxurious, it only does 17 mpg! >> >> Roger Holmes. >> >> > Roger > I'm a few miles south of Gatwick on the M23 > > Transport options are > > 55MPG SAAB 9-3 > 30MPG Citroen Berlingo > 19MPG Bristol > > So forgetting the gas guzzler classic its a SAAB 4dr or a Van with seats > for more load capacity. > > > roger Hi Roger, I'll mull that over, Gatwick is over an hour away. I guess it depends if you go clockwise or anti-clockwise around the M25 (or through the middle of London). My main classic computer is too big to take (Needs a couple of tail lift lorries and 3 months to re-assemble). Roger.

15 years, 11 months

IBM System 360 Model 91 operator console from 1969

by alexeyt＠freeshell.org

On Wed, 12 May 2010, dh wrote: > Sorry I forgot . here is a picture. > > http://www.thegalleryofoldiron.com/36091CART.JPG Holy crap, that is a lot of lights. I think that may be more lights than on all the machines I have put together... Does it display every register in the machine? How big is the cable that carries all those signals??? Alexey

15 years, 11 months

Anyone want a Creed teleprinter or got an Elliott paper tape reader head ?

by roger.holmes＠microspot.co.uk

I am still after an Elliott paper tape reader head, preferably 1000cps but the 300cps would be acceptable. I have a Creed 7E which is a 5 bit teleprinter. The covers are missing and I have not tried powering it up yet. Someone has attached a DIN audio type plug to it, and a friend suggested maybe it had been connected up to a BBC micro. Anyone want to do a trade, either barter or for cash on either of these. I expect to be going to VCF England or whatever its called. I am in the UK, in the Low Weald of Kent to be more specific. Roger Holmes

15 years, 11 months

Microcornucopia Magazine

by elazzerini＠interfree.it

Hi at all, today i begun to scan my issues. At this moment i done MICRO CORNUCOPIA No.14 Oct 1983 http://web.tiscali.it/enrico.lazzerini/MICRO_CORNUCOPIA_No.14_Oct_1983.pdf and MICRO CORNUCOPIA No.16 Feb 1984 http://web.tiscali.it/enrico.lazzerini/MICRO_CORNUCOPIA_No.14_Oct_1983.pdf Is out there who has issues from 1 to 11 and would scan some his issues??? I think this would be the only change we have to : - gain issues we not have - save this wonderful past and defunt magazine Regards Enrico

15 years, 11 months

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