>From: "Tom Jennings" <tomj at wps.com>
>
>
>If you just want to play and make a 4 x 4 core or something, I
>wonder if you couldn't get decent hysteresis with some other
>ferrite product. You could compensate for a "poor" core with good
>electronics and/or brute force. I haven't looked at a toroid spec
>sheet in ages and not for hysteresis.
>
Hi
Many of the cores designed for RF will take a magnetic
set. One normally doesn't do it intentionally because
it changes the inductance but they can be magnetized.
Dwight
Re:
"While sorting stuff today, I came across the Dysan software for testing
floppies. We used to use this for testing many of the early full size
and half height 5 1/4 floppies. Dated 1985, 5 disks and manual in a
plastic wallet binder.
I was going to put it up on eBay but realised that maybe someone on the
list would get more benefit from it. Would rather see it go to a good
home than make a dollar or two from it. Let me know.
Billy"
While the digital diagnostic disks themselves cannot be duplicated, the
programs that analyze the disks are just normal EXE files. You should be
able to copy those, and then you could both sell the originals and also make
the analysis programs available. In my case, I have the DDD disks, but not
the programs to run the analysis. [Although I'd like to get a 3.5" disk].
By the way, it's Dysan, not Dyson
I would also be interested if there is a large order being put together for
the Keytronics keyboards foam pads (depending on the price, of course).
[Barry Watzman, Watzman at neo.rr.com]
We've got one of these critters on the way - it's a 64-processor system
in a crate, apparently with transparent case so that the inside can be
seen.(ooh!)
I believe the CPUs are T800's...
Anyone able to tell me anything more about the ParSiFal project though?
(Ram?) Info via Google seems extremely thin on the ground. I'd quite
like to find out what I can in advance. From what I've been told, a few
of these were built by Manchester (UK) uni for SERC, but that's about
the total of what details I have at present.
I'm not sure what, if any, documentation or software it'll be coming
with, what state it's in etc. yet....
SERC still exist, so I'll give then a prod after I've picked the thing
up in case they have archives of software from the project still.
cheers
Jules
IRIX versions for SGIs can be a pain. The easiest recommendation is as
follows
For Indigo2 forget 5.3 unless you're running a minimum system. There are many
many different versions for specific hardware and they are hard to get a hold
of the right one. Doesn't run at all on anything other than IP22 (R4400) on
the I2, not POSIX complient so you'll have trouble building your own S/W. For
most Indigo2s what you want is IRIX 6.2- fast, POSIX/Y2k complient (when
patched) and smallish. It also has 64-bit XFS. You want at least 64 MB. For Indigo2
R10000 you need a special release (th only one for 6.2), IRIX 6.2 with Indigo2
IMPACT 10000 (this release will run on all Indigo2s and Indys, can't remember
about Indigo R4ks, but NOT any big system.)
Forget about 6.3&6.4, these are HW specific for O2 and Octane/Onyx2/Origins.
6.0 and 6.1 likewise, buggy and only for the R8000.
Fast R4400 and R10000 systems probably benefit from IRIX 6.5.x, any version
will run on them (I've heard that 6.5.14 and 6.5.22 are the best, I run .22,
last version for pre O2/Octane equipment.) .22 seems faster than .17 to me.
Disadvantage - somewhat pricey on the "grey market" (bought seperate from a
system). You will want more than 128 MB of RAM, though.
They will boot from any disk (default is system disk: ID1, CDROM id#3, but
they aren't so fussy as Suns. As has been said, SGI decided to be "different"
and make the host adapter 0 instead of 7). Mine is perfectly happy with a SCA
adapted disk on the sled.
Indigo2 might look bad next to an Octane, but in many things it will trash or
keep up with O2, so don't knock it yet.
Where are these $100 Octanes? I want one!
Scott Quinn
>
>Subject: Re: small valves
> From: Tom Jennings <tomj at wps.com>
> Date: Mon, 23 May 2005 00:20:47 -0700 (PDT)
> To:
> Cc: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
>
>One word: hysteresis.
It is the one thing that makes it possible.
>I bought a few hundred thousand new/unused plain cores on ePay a
>few years ago, for about twenty bucks. The problem is they're
>about .005" OD! If you're going to make your own at home without
>slave labor to go blind for you, you'll probably want cores large
>enough to handle.
You supplied me some once. I was able to assemble a 4word by 8 bit
mat but I've not had time to actually drive it. Took two tries to
make it. The wire used must have a insulation that is nick resistant.
>If you just want to play and make a 4 x 4 core or something, I
>wonder if you couldn't get decent hysteresis with some other
>ferrite product. You could compensate for a "poor" core with good
>electronics and/or brute force. I haven't looked at a toroid spec
>sheet in ages and not for hysteresis.
I use a lot of the F and FT series torids down the .125" and
never saw any spec for hysteresis and I suspect sing most are
not easily saturable that would be the difficulty with them.
However tehy make near ideal transformeers at 100mhz!
Allison
My C64's 906114-01 chip just went up on me, in the middle
of playing the lemonade stand simulation too :/
My 1541 and 1530 still operate perfectly though!
Any chance I could get a rom chip off anyone?
I'm told it's either the BASIC rom or Kernel ROM
My classic computer collection just got knocked back to nothing :/
>
>Subject: Re: small valves
> From: "Dwight K. Elvey" <dwight.elvey at amd.com>
> Date: Mon, 25 Apr 2005 09:57:08 -0700 (PDT)
> To: cctalk at classiccmp.org
>Hi Stan
> I've done similar. I've taken one of those small 100W
>inverters and rewound the transformer on it to provide
>all the voltages for my older battery powered Atwater
>set. It just runs from a 12 volt gel cell. I tapped
>of the primary to provide the filament voltage and
>used the secondary with tape to provide the rest.
>As I recall, there was one -C and two +B voltages.
>I used no regulation, just used the right rinding
>ratios. One has to remember, these old radios
>were made to run form carbon-zinc cell in most cases.
>I did put a pot on my C cell. The original was -4.5v
>but I found that it works better, with less distortion,
>when set at about -3.5v.
>Dwight
Good approach. I enjoy building and winding my own cores
be they EI iron or powered iron/ferrite types is part of
that. Switching mode PS design is an art in itself. Part
of the fun is building for good efficientcy and for powering
tube designs that means knowing the load.
An aside is don't run regens off inverter or switching supplies
as the gain is high enough to negate reasonable shielding
and bypassing. For that I find common alkaline 9V batteries
in series do well for the typical 27-90v range and exhibit
good life.
Allison
Hi all,
I ened some help in the area named above.. picking up some boxes
and then shipping them out. If you're willing and able to help,
pse drop me a note off-list !
Thanks,
Fred
--
Fred N. van Kempen, DEC (Digital Equipment Corporation) Collector/Archivist
Visit the VAXlab Project at http://VAXlab.pdp11.nl/
Visit the Archives at http://www.pdp11.nl/
Email: waltje at pdp11.nl BUSSUM, THE NETHERLANDS / Mountain View, CA, USA
On May 23 2005, 1:15, Jochen Kunz wrote:
> On Sun, 22 May 2005 17:58:24 EDT
> Saquinn624 at aol.com wrote:
>
> > Fast R4400 and R10000 systems probably benefit from IRIX 6.5.x, any
> > version will run on them
> IIRC 6.5.20 is the last version to officially support any "non-PCI"
> machine.
Actually 6.5.22 is the last release to support Indy, Indigo^2, etc.
--
Pete Peter Turnbull
Network Manager
University of York
