On Tue, 9 Mar 2004 Gooijen H <GOOI(a)oce.nl> wrote:
> I am not sure that removing the brake will help.
More likely not. In fact, the break is there for a reason. To stop the
drive when spinning down. Otherwise, it will spin for a long time. I also
suspect that the break is engaged until you try to spin the disk up, so
that the disk don't swing back and forth just because you move the drive
around.
> I once heard the following rumour:
> the brake in combination with the 'heavy' motor
> makes sure that the disk platters always rotate
> in the same direction, never for a short instance
> in the other direction (vibration, power flutter,
> whatever reason). Rotation in the opposite direction,
> for any short moment, will cause the air on which the
> r/w head fly to disappear and result in an immediate
> head crash ...
Are you suggesting that a platter, weighting several kilograms, spinning
at something like 3600 rpm, suddenly can change spin direction at a
millisecond notice?
> As I said, it is a rumour I once heard a few years ago.
> Has anybody heard of this too?
That's one of the more outrageous rumours I've ever heard. :-)
The amount of energy required to do that trick would blow every fuse in
your house, and then some. We're talking about living mass here. Physics,
you know... ;-)
However, vibration can cause a head crash...
Johnny
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt(a)update.uu.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
For all the folks who were interested in purchasing a SCSI Zip drive from
me, my apologies for the delay. I'm still trying to get them tested.
Please continue in your mode of patience.
--
Sellam Ismail Vintage Computer Festival
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FYI:
Justice, FBI Seek Rules for Internet Taps
By THE ASSOCIATED PRESS
Published: March 13, 2004
Filed at 8:09 p.m. ET
WASHINGTON (AP) -- Technology companies should be required to ensure
that law enforcement agencies can install wiretaps on Internet
traffic and new generations of digital communications, the
Justice Department says.
The push would effectively expand the scope of the Communications
Assistance for Law Enforcement Act, a 1994 law that requires the
telecommunications industry to build into its products tools that
U.S. investigators can use to eavesdrop on conversations with a court
order.
Fearful that federal agents can't install wiretaps against criminals
using the latest communications technologies, lawyers for the Justice
Department, FBI and Drug Enforcement Administration said their
proposals ``require immediate attention and resolution'' by the
Federal Communications Commission.
They called wiretaps ``an invaluable and necessary tool for federal,
state, and local law enforcement in their fight against criminals,
terrorists, and spies.''
``The ability of federal, state, and local law enforcement to carry
out critical electronic surveillance is being compromised today,''
they wrote in legal papers filed with the FCC earlier this
week. ``Communications among surveillance targets are being
lost.... These problems are real, not hypothetical.''
The FCC agreed last month to hold proceedings on the issue to
``address the scope of covered services, assign responsibility for
compliance, and identify the wiretap capabilities required.''
Critics said the government's proposal would have far-reaching impact
on new communications technologies and could be enormously expensive
for companies that need to add wiretap-capabilities to their products,
such as push-to-talk cellular telephones and telephone service over
Internet lines.
The Justice Department urged the FCC to declare that companies must
pay for any such improvements themselves, although it said companies
should be permitted to pass those expenses on to their customers.
Stewart Baker, a Washington telecommunications lawyer and former
general counsel at the National Security Agency, complained that the
government's proposal applies broadly to high-speed Internet service
and puts limits on the introduction of new technology until it can be
made wiretap-friendly.
Baker said the plan ``seeks to erect a brand new and quite extensive
regulatory program'' that gives the FBI and telephone regulators a
crucial role in the design of future communications technologies.
I have a whole flock of HP cables labeled 12979-600xx. That sounds really
familiar to me, but I'm drawing a blank on what these cables are for. In
addition to the part number, they say "Extender Cable" on them. Based on the
box they were in, I suspect they have something to do with disc drives.
However, that part number doesn't show up in my 7906 manuals, I know the
7900 daisychain cable is 13212, and they aren't I/O chassis extender cables.
Anyone know offhand what these cables are for? They have one standard HP
edge card connector on each end.
Thanks!
Jay West
Hey ya'll I finally went to the archives when I didn't receive any responses here and found that ya'll couldn't open the pics... so here they are in zip form... could someone please tell me what the heck this is from? Thanks
Lyos Gemini Norezel
http://geocities.com/lyosnorezel/strangekeyboard.zip
Do you Yahoo!?
Yahoo! Mail - More reliable, more storage, less spam
Interesting that two references to an old post I made concerning the
Yamaha synthesizer I listed here (before putting it on eBay - whereupon it
sold to someone in the UK) are just now coming to the attention of
Googlers - perhaps I'm making too much out of a co-incidental pair of
posts - yet it seems to me that these "Hi There! Do you still have your
NOS IBM 360/70 for sale?" type posts do tend to come in 'topic waves'....
Cyber-sociology is alive and well on Classiccmp.
Cheers
John
PS: Now watch: in a year somebody will be brethlessly asking if the IBM
mainframe sold yet.... ;}
On AOL upload the pictures to a screenname space and publish that location.
(i.e.: http://members.aol.com/innfosale/ebay/9845br1b.jpg )
AOL zips all multiple pics so I don't use it for that. I, too, get
uncomfortable receiving zips and generally do not download them.
Rarely do I open one even if it is from someone I know.
AOL has gotten much better. (my opinion as a user, please no flames).
Paxton
Astoria, OR
At 07:50 14/03/2004 -0800, you wrote:
>
>I have recently acquired a Dy4 DSM 6816, a 68000 based workstation which
>appears to be from the mid 80's.
>
>--
>
>Is this a Multibus system based on the original Stanford SUN cpu board?
It's a VME bus system. I can send pictures of the system and it's boards if
that helps - right now I know nothing about it other than physical appearance.
Regards,
--
dave04a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Vintage computing equipment collector.
The Keyboard is for a Convergent N-gine system. Modular little boxes that
coupled together sideways. Also sold by Burroughs.
First ones were 80186 systems. The last ones I saw were 386s. Did they ever
make them in Pentiums?
Paxton
Astoria, OR
I have an HP 98041A disc interface available.
This is a desktop type box that has a cable and big module that plugs into
some kind of HP 98xx calculator/computer. The box has an HP-IB port on the
back.
As best I can tell, this box plugs into the HP-IB port of large old 14" HP
drives like the 7906H, or, in the configuration I received it, the box plugs
into the HP-IB port of an HP-IB optioned 13037 controller. This would allow
the calculator to use non-HP-IB drives such as the 7905, 7906A-D, and 7920.
This particular one was hooked up to the HP-IB port on a 13037 running to a
7906D drive.
I have no need for this, it's available for trade. I have no way to test it,
but based on the things I received in this load, I would hazard a guess that
it probably does work.
Jay West
