test-drb August 2013

test-drb@ccmp.vtda.org

174 participants
181 discussions

by shadoooo＠gmail.com

I would add to my previous post that the operation of moving the bumper holder MUST be done with the disk at full rotating speed. In fact, this will move the head, that must fly on the disk surface. When done with halted disk, the head movement could cause severe damages. PS - BTW if somebody has a great amount of these disks to be repaired, I would be glad to have some for my DEC machines here. Andrea

10 years, 10 months

FS: Apple //c, //e and Mac Plus- All loaded tricked out systems

by slandon110＠gmail.com

Clearing out some more of my personal collection Nice Apple //c plus with original box, Monitor //c with stand and UniDisk 3.5 drive $150 dollars Can Deliver to VCFMW/ECCC if paid for in advance A loaded Mac Plus with 4MB RAM 20SC Hard Drive with 100MB Drive installed Apple CDSC CD-ROM Unit PowerUser Syquest 44mb drive with a ton of carts DaynaPort E/Z Ethernet Adapter for Mac Plus $150- Can deliver to VCFMW/ECCC if Paid for in advance Apple //e system CFFA 3000 Card Echo II Speech Synthesizer Card AppleTalk Workstation Card- Lets you connect your //e to AppleTalk Network DuoDisk 5.25 Drive Color Monitor //e Mouse Card with Mouse Taxan 64k RGB Monitor card, Use any RGB Monitor with the //e $400 dollars- Can Deliver to VCFMW/ECCC if Paid for in advance

10 years, 10 months

DEC RF74 fault light oddity

by binarydinosaurs＠gmail.com

Folks, I replaced a dead RF74 for a customer this morning and noticed the fault light was flashing while the drive was spinning up (the 'chirrup noise') so I set up its DSSI parameters and booted the system. No errors on startup, and indeed no errors while I was copying things to it, but the fault light appears to be acting like a drive activity light which is not something I've ever seen before. The drive works fine, all $ANALYZE commands are happy. Anyone? Cheers, -- adrian/witchy Owner of Binary Dinosaurs, the UK's biggest home computer collection? www.binarydinosaurs.co.uk

10 years, 10 months

My Compaq SLT/286 on YouTube

by terry＠webweavers.co.nz

My Compaq SLT/286. Lovely machine but getting a new Dallas battery in there is not easy. http://youtu.be/DJWyaJ086Ho

10 years, 10 months

Fixing a Micropolis 1375 drive?

by shadoooo＠gmail.com

The problem indeed is often caused by a gummy part going to goo after some years... The head assembly can move around a fixed axis near a front edge of the disk. The extremes of this movement have a couple of bumpers of this short-lasting gummy, that after 10 years goes to a viscous black material, loosing its tickness: that is, the extremes of the movement are now some degree more than the original device. Note that the bumpers are attached to metal holders that can be moved sligtly and that are fixed to the holding structure with two bolts each. (i can provide pictures of it all). The heads when the disk is stopped down "fly" to the park position, that is on one of the extreme (the most inner position over the disks). As the disk is powered up, the electronics put the heads to the inner end of the parking area, so the mechanical lock, that holds the heads even when the disk is powered down, can be easily disengaged. On the faulty drives, because of the loss of thickness of the bumpers, this operation let the head to fall outside the park area (too much toward the inner part of the disk) causing the electronics to detect a problems, and so forcing a new park operation, and all restarts.... I fixed this problem on a couple of disks. I needed to open the disks in a very clean room (few dust around), powering the disk at open-hearth, loosing a little the two bolts of the park area extreme, and moving the bumper holder slowly with the disk in movement, so letting it retry the spin-up sequence, until it seems to regain normal operation. Then I give a little bit more of thickness (we are talking about 0.1mm more or so) and refixed the two bolts. Then I tried to power-down and power-up to be sure that all works well. This saved a couple of disks completely. If you need it, I can supply good pictures of the inside of the disk, with some more advice. Andrea

10 years, 10 months

Computer Rental

by jthecman＠netscape.net

Hello I received a email from a movie company wanting to either buy or rent a IBM model 5150 computer for a moving they are shooting. The museum has one one but I have no idea what a good rental rate would be per week or month. Also it would be shipped out of the country and Im thinking a large deposit would be required for this to happen. Has anyone done something like this before and can share some tips? John K

10 years, 10 months

Free NorthStar Horizon manuals in So Cal.

by tosteve＠yahoo.com

Free for the cost of shipping: 1. NorthStar Horizon Computer System Manual (DD) 2. NorthStar Z80A Processor Board ZPB-A Manual 3. NorthStar System Software Manual4. NorthStar 32K RAM 5. NorthStar Horizon HRAM Users Manual http://bitpig.com/temp/NS-manuals.jpg Located in southern California - Orange County 92656

10 years, 10 months

HDOS commands and syntax

by starbase89＠gmail.com

Greetings! I recently acquired a Heath H89 computer with an H77 disk drive. I've gotten it to boot into HDOS, but I don't know how to make it do anything. Is there a reference available online? I mainly want to know how to mount disks, view their contents and run programs. Thanks for any help! Joe

10 years, 10 months

Computer Rental

by jonas＠otter.se

On Sun, 11 Aug 2013 23:55:02 -0600, Eric Smith <spacewar at gmail.com> wrote: > I still haven't actually seen_Swordfish_. Maybe I'll rent it some day. > > Eric Don't. It is really awful.Travolta and the terrible plot and screenplay nullify any good which Hugh Jackman, Halle Berry and Vinnie Jones do. /Jonas

10 years, 10 months

Fixing a Micropolis 1375 drive?

by tingox＠gmail.com

Hi, A friend of me recently got a nice machine, a ND (Norsk Data) Satellite Network Gateway. (For people wondering about Norsk Data, check www.ndwiki.org) Anyway, the drive in the machine is a Micropolis 1375 scsi drive. And it stopped working. Of course it was "goo" on the head assembly bumper(s). He has removed that and inserted a paper strip, but the drive still doesn't work. Are there any other known failure modes for the Micropolis 1370-series drives? Description of symptoms (translated by me, any errors are mine): - the drive spins up - disk activity light (on machine?) turns on - after a while the drive reduces RPM noticeably for about a second the last two steps repeats, and after about 5 minutes the drive spins down and stops rotating. But the disk activity light still blinks, and a faint clicking noise is heard every time the disk activity light is on. He also wonders if moving the electronics from a different 1375 drive to his drive would work, assuming he could get one that works. Has anyone done this? (those refurbished Micropolis 1375 drives at about USD 400 looks a bit suspicious - the technical data is different) -- Regards, Torfinn Ingolfsen, Oslo, Norway

10 years, 10 months

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test-drb August 2013