I dont know if anybody is interested in these but I have a bunch of unused
Facit ribbon's for the Facit B3150 / B3350 / B3550 / D635 / E630 / E750.
They are free for shipping costs or you can pick them up too offcourse.
Located in the Netherlands.
Cheers,
Stefan.
http://www.oldcomputercollection.com
I dont know if anybody is interested in these but I have a bunch of unused
Facit ribbon's for the Facit B3150 / B3350 / B3550 / D635 / E630 / E750.
They are free for shipping costs or you can pick them up too offcourse.
Located in the Netherlands.
Cheers,
Stefan.
>From: "John Honniball" <coredump(a)gifford.co.uk>
>
>Jules Richardson wrote:
>> In the six or so Atoms that have passed through my hands though I've
>> never had one with the original supply, so I can't confirm that :) (All
>> of mine have either been kits - and I assume the PSU was optional - or
>> previous owners have bypassed the regulators and used a more capable
>> supply)
>
>Ah, that was a standard modification. The Atom uses two 7805
>regulators in parallel, which is not a good way to turn two
>1A regulators into a 2A PSU. In practice, one regulator
>(depending on the voltage tolerances of the parts) takes
>nearly all the load, while the other regulator just sits
>there. So, many Atom users who expanded their machines
>also bypassed the regulators and added a proper external
>supply.
>
>I'll check my boxed Atom in the loft sometime to see what
>brick it's got.
>
Hi
Although, not particularly good practice, as long as the
power dissipation is kept down, this is a design within specifications
of the part. They have built in current limit and are suppose
to be able to handle continuous loads in current limit.
This means that they can be paralleled.
I once talked with some application engineers at National
about this type of operation.
Dwight
>From: ard(a)p850ug1.demon.co.uk
>
>>
>> Interestingly, there's no feedback between the low-voltage side of the
>> switching transformer and the circuitry surrounding that SOC603B 6-pin
>> IC, so maybe it isn't an opto-isolator at all. All the circuitry
>
>That does not suprise me. Since there's a pulse transformer in the
>chopper base circuit, the controller IC is on the isolated side of the
>PSU (the isolation is performed by the pulse transformer), so there's no
>need for any optoisolator in the voltage feedback loop.
>
>One question. Have you found how the controller IC gets its power? Is
>there a separate (maybe linear) PSU for this?
>
Hi
I just thought I'd note that you don't need feedback if the
transformer is just used to drive a square wave and not
used as a flyback type. It just comes down to turns ratios
for the voltage. If there is a post regulator, having a
regulated switcher is not needed.
Most PC supplies use a flyback type and regulate the 5V line
by the switcher to maximize efficiency but I doubt HP was
concerned about that.
Dwight
Hi everybody,
I have an old SGI Indigo (IP12) which refuses my attempts to populate
the harddisk with Irix 5.3. The harddisk doesn't boot, so I assume it to
be empty.
I get sashIP12 and fx.IP12 to load from cd, but using fx with that hd fails:
SGI Version 5.3 IP12 Oct 31, 1994
fx: "device-name"= (dksc)
fx: ctrl#= (0)
fx: drive#= (1)
... opening dksc(0,1,)
dks0d1s10: Drive not ready: RAM failure, ASQ=0x80.
fx: warning: Failed to open dksc(0,1,10)
SGI Version 5.3 IP12 Oct 31, 1994
(and the same again, if I want)
Is it trying to open a non-existent partition dks0d1s10? Is it a
software-fault? If it's a hardware fault: What's broken: hd or ram?
The hd is in the bottom drive bay. After my enter keystroke in line 4
(drive#=1) the led flashes for a short time and at the same time (or
maybe some millisecconds later) the error message appears.
The error isn't very meaningful to me. Does anybody know about the
problem or does have any hints?
Thanks in advance,
Fabian
(intentionally blank)
=====
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> I get "Internal error #300" and "Mac OS error -23" pointing to a
>funkyness on the part of the TCP/IP stack / driver / panel / thingy, as
>far as I can see from looking up endless pages of error codes. And I've
>made all the settings recommended... also, the cable is known good and
>works perfectly when drug back into the office and hooked up to this
>laptop upon which I type.
I assume you have the OS Install CD that came with the Mac. Reinstall the
networking portion (if it gives you an option). If not, just reinstall
the entire OS. As long you don't do a "clean install" then it will safely
drop the new OS right on top of the old one, and you shouldn't really
know the difference. (clean install is NOT the default so you shouldn't
have to worry about it).
However, since you are seeing odd problems, I would run Disk First Aid
first at the very least. If you have a better disk checking program, run
that too (Tech Tools or whatever). There is a good chance there is some
kind of disk corruption that killed the Open Transport drivers.
If you don't have a copy of the OS that you can reinstall from let me
know off list. (Apple keeps going back and forth with shipping a usable
install CD versus just a reimage CD, so I don't know which you have)
-chris
<http://www.mythtech.net>
At 19:54 23/11/2004 +0000, you wrote:
>Dave Dunfield wrote:
>> Can anyone give me the pinout and details of the power
>> supply used on the Dragon32 (have a machine with no
>> supply) - It has a 9-pin 'D' connector on the back of
>> the machine for the power input!
>
>OK, I've just got my machine down from the loft and had a look
>for the manual -- but I don't have a manual! So, time to test
>it with a meter...
>
>Pin 1 joined to Pin 6, one side of 8.5V AC Red
>Pin 2 joined to Pin 7, other side of 8.5V AC Black
>Pin 3 14V AC Yellow
>Pin 4 0V White
>Pin 5 14V AC Blue
>
>The two 14V AC windings form a centre-tapped 28V winding, which
>according to the label on the transformer is rated at 250mA. The
>8.5V winding is rated 1.5A. The actual voltages I measured were
>8.9V and 14.3V (twice), so they're slightly higher off-load. The
>9-pin 'D' connector on the end of the PSU cable is a female. The
>PSU itself is clearly just a transformer in a white plastic box.
Hi John,
Thanks for the info - makes perfect sense, an 8v input to drive
a 5v supply, and C.T. 28v input to drive +/-12.
I shall see if I can fire it up this weekend.
Regards,
Dave
--
dave04a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Vintage computing equipment collector.
http://www.parse.com/~ddunfield/museum/index.html
Have a G4 400 running OS9.2.2, 1G ram, used as an 'appliance' computer
in my studio.
As a result of a bizarre problem in getting a new software package to
authorize (so far the company can't figure out why it's broke - !) I need
to hook the Mac up to the Rest Of The World and download a bunch of
patches and crap.
To date, I have never used this computer on-line - so I drug Cat5 cable
in from the switch, hooked it up, and Voila! 'That Which Communicates' is
also completely hosed.
I get "Internal error #300" and "Mac OS error -23" pointing to a
funkyness on the part of the TCP/IP stack / driver / panel / thingy, as
far as I can see from looking up endless pages of error codes. And I've
made all the settings recommended... also, the cable is known good and
works perfectly when drug back into the office and hooked up to this
laptop upon which I type.
I've spent the better part of three hours turkey-ing about with this -
and I have *way* too much invested in it to just heave it into the desert
like I want to - so I thought to bend the List Protocols a bit and see if
anyone has one of those "Oh, yeah, here's what ya do..." type responses.
More info will be cheerfully supplied, I don't know what elese to add.
Cheers
John
>
>Message: 2
>Date: Wed, 17 Nov 2004 00:25:22 +0000 (GMT)
>From: ard(a)p850ug1.demon.co.uk (Tony Duell)
>Subject: Re: KM11 maintenance module
>To: cctalk(a)classiccmp.org
>Message-ID: <m1CUDdV-000JEQC@p850ug1>
>Content-Type: text/plain
>
>> See if you can find the cpu manuals for an 11/70. There are some
>> documentation on the KM11 in those, I seem to remember.
>
>The original KM11 (I was given a pair _after_ making my homebrew
>version..) consists of 2 boards -- IIRC W130 and W131. One contains the
>switches and lamps, the other the driver transistors, etc. The latter
>goes into the backplane slot and had an edge connector on the end to
>connec to the former.
>
>I think I got the schematics in the RK11-C printset, certainly it's
>either there or in the 11/45 prints.
>
>-tony
>
The KM11 is also present in the 11/05 (11/10) printset I have.
I would also expect this to appear in the 11/35 (11/40) printset too.
The interesting thing is that in every different place the KM11 is used, a
different overlay will redefine the meaning of the lamps, so in fact you
will need this picture of the overlays too!
Frank
