> From: Aaron Jackson
> I am wondering if anyone would be willing to sell me an RL02K cartridge
> for a sensible price?
There are a bunch listed on eBait for not wholly unrealistic prices; I
wouldn't buy a bunch there, but it you only need one, for testing... Not sure
if any of the ones for sale there are the moment are in the UK, though. (I
recall some a few months ago, so it's not impossible, and worth a check.)
> From: geneb
> they've got a DPS-8 maintenance/operator/? panel ... It's fully
> operational and is connected via some magic hardware to a Raspberry Pi
> running a Multics emulator.
Technically it's an H6180; the DPS-8 is a later generation of hardware in the
same family. More here:
Alas, as can be seen there, the DPS-8's don't have those wonderful panels
with a zillion lights and switches; just boring modern machines! :-)
Would anyone here be able to help me troubleshoot my qd32 controller? I
have a pdp11/73 that's mostly working, boots 2.11bsd from rl02 okay, but I
need my big disk to work so I can load the rest of the distro.
I've been following the manual for the qd32 to enter the geometry of my
real working Fuji m2333 (jumpered correctly according to the manuals), but
when I load the special command into the qd32's SP register that's supposed
to load the geometry table I entered in pdp11 memory to the qd32's novram,
I get a bad status value from the qd32's SP register and it remains
unresponsive when I try to store the geometry. If I go ahead and try the
built-in qd32 format command, it responds similarly. When I pull in mkfs
>from tape (vtserver) and try anyway, despite the failures, to run mkfs on
the m2333, I get an !online error from the standalone unix mkfs. The disk
does respond (the select light flashes and I can hear heads actuating), but
without geometry and format, I'm obviously dead in the water.
I understand that there used to exist some Emulex qd32/pdp11 diagnostics
that could help the situation, but my previous attempts to find copies have
come up short.
Any suggestions on how to proceed?
Inspired by CuriousMarc's recent video, I cleaned and fixed my RL02
heads. Not with an ultrasonic cleaner unfortunately, but in a warm IPA
bath. It worked! Loading a crashed pack is obviously not a good idea,
although I cleaned the cartridge well, and figured with bad heads and a
bad pack, I might as well try it. The heads no longer crash and appear
clean after loading, but the cartridge, of course, cannot be read as the
first track has been destroyed from the initial crash. I think the crash
was cause by bad heads before I got the RL02 drive.
I posted some pictures of the process here:
I am wondering if anyone would be willing to sell me an RL02K cartridge
for a sensible price?
After the cleaning I am guessing my alignment will be slightly off, but
>from what I have read in the manual, this is will probably just result
in the read/write speed being reduced as the heads have to move slightly
when switching between either side of the platter. Am I right in
thinking this or completely wrong?
PhD Student, Computer Vision Laboratory, Uni of Nottingham
I am having a re-org of the workspace and have decided to release a number
of books acquired over the last 3/4 decades but I am in a quandary as I
can't store them, don't think the local Cat's Protection League can handle
them and I am reluctant to consign them to the skip. While I appreciate that
they may not qualify as true vintage currently they will be before too long,
like PL/1 primers were years ago when folks were skipping them. I have
between two to three dozen (some big) and won't impose here by listing them
all but they include such nuggets as 'Secrets of Windows 2000 Server', 'MTS
Programming in Visual Basic', Kernighan's 'Software Tools in Pascal',
'Understanding and Programming COM+' and 'Developing Professional
Applications in Windows 95 and NT Using MFC'. I have most if not all of the
accompanying CD's. I am afraid my 'Introduction to Programming using Fortran
77' and 'Lepton and Baryon Number Violation in Particle Physics,
Astrophysics and Cosmology' along with my Amiga development manuals are not
up for grabs (cold, dead hands, etc.)
I can't expect anyone crazy enough to take the whole lot (but free for the
collection if you like and welcome) but does anyone know anywhere who would
take them and keep them for posterity? Just can't stand the thought of good
books being destroyed.
Please post here if you can help then we can take it off-list.
Proud owner of:
Amiga 500 (x4), Amiga 1500 (x2), Atari 1024 (maybe), BBC Model 'B', Amiga
3000, Amiga 4000, Cromemco System One
Proud builder of:
Imsai 8080, North Star Horizon, Processor Technology Sol-20, Nascom-I,
Proud past seller of all of the above plus:
Cromemco, Vector Graphic, Compucolor, Ohio Scientific, Commodore (PET,
VIC-20, 64), South West Technical Products
KIM-1, Osborne-1, Exidy Sorcerer, ITT 2020, Dragon 32, Apricot, Comart, IBM
> From: Al Kossow
>> On 2/18/18 12:20 PM, Brent Hilpert via cctalk wrote:
>> ... his 709 went to the CHM. Anything else of the big stuff?
> the 7094 and 650
A 7094? Neat! Very historic machine.
I wonder if it would be possible to fabricate the extras needed to run CTSS
on it... :-)
currently, I am in the process of trying to bring back to life a disk drive installation from Control Data known as "841 Multiple Disk Drive" ( MDD ). From the early '70s. It uses hydraulic disk head actuators! Pictures of the subsystem are here:
I started with the power supply. Most of the electrolytic capacitors need to be reformed which is being done.?
As far as I know, some computer installations used 400Hz 3-phase back in the days. Does anybody know, if that is the case for this type of drive systems? I couldn't find any indication so far, except for the input filter that supports up to 400Hz (written on it).
I've quite some experience with old linear power supplies, but never worked with three-phase supplies, yet.
Has anybody experience with this? Anything particular to be considered?
There is an operator's manual, but there don't seem to be manuals or schematics about this type of CDC drive nor on bitsavers, neither elsewhere on the net. How could help me in pointing out where to get these?
A lot of questions, I know.... :)
Thanks a lot for any of your precious help,
Pierre's collection of classic computers moved to: http://www.digitalheritage.de