Apple Desktop Monitor

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I was given a desktop Apple case and monitor,  It comes up fine when I
add to it my USB mouse and keyboard.  I notice the monitor connects
with a DVI connector.  I wanted to try the monitor one of my MS XP SP3
systems,  but I see right off that my DVI connector does  not match -
the Apple connector is larger than my connector.

Is there an adapter to make them match?  Will my MS machine work then
with this monitor?  The monitor is a nice flat-screen.


Re: Apple Desktop Monitor wrote:
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Example of a solution.

You can see here, that pin 1 and pin 2, carry power to the monitor.
That is why the Gefen box has a 24 volt power supply. I don't know
exactly what the USB cable would be doing, but it does make a
nice source of +5V if that voltage happens to be needed.

You also have to consider the native resolution of the monitor, and
whether your video card supports it or not. Running at the native
resolution, gives the nicest results.


Re: Re: Apple Desktop Monitor

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Well I sure learned something today!  It was laziness on my part that
I did not Google the subject.  Sorry about that.

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Hi Paul and thanks.

Yes, I understand about native resolutions, and had dealt with them. I
can check to see what the resolution is for that monitor, and I will.

Re: Re: Apple Desktop Monitor

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Paul - I found this

on EBay

for a cheap price a lot less than others at $100.

Think it will do the job (ie connect the monitor to my computer's
DVI)?  These adapters are not directional are they?
Thanks again

Re: Apple Desktop Monitor wrote:
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OK, so ADC has the DVI signals plus a power source on it. The
shape is different, so you won't try to use a non-powered source.
(I also understand USB is involved, but I don't understand why. Perhaps
it is for a convenience port for a keyboard/mouse to plug in.)

If the monitor was a "regular" monitor, and has its own 120V power cord,
then you know the monitor is powered. All you need in that case, is a
solution with the appropriate connector shapes on the end. That would be
something like the Belkin solution.

You can find that Belkin on Newegg for $30.

But the Belkin goes from an ADC computer to a DVI monitor. And the
DVI monitor would already have its own power source. That is why it
is cheap. There is no power source, because the DVI monitor has its
own power cord. It is a simple connector conversion and a short length of cable.

So if your monitor already has power, then all you need is a simple adapter,
with the right polarity connectors on the end.

If the monitor has no AC power cord, then it is expecting 24VDC power on the
ADC connector on the monitor. In which case, the adapter you use, needs to
have 24 volts on it, to power the monitor.

To summarize the options:

    DVI ----------> DVI            usual DVI cable

    DVI ----------> ADC monitor    monitor needs power,
  +24VDC                           so the cable adapter needs a 24VDC power
                                   Gefen makes one, but there are possibly others

    ADC ----------> DVI monitor    monitor already has power,
  computer                         just a simple adapter is needed.
                                   This might be the Belkin F2E9142

    ADC ----------> ADC monitor    usual ADC cable,
  computer                         computer supplies power to the monitor,
                                   monitor has no power cable of its own.

More details on the Belkin here.

Note the warning about the Belkin here. Look at the connector on the
end, and see whether you have anything that fits. That connector is
a DVI-D. /

The Wikipedia article has pictures of the various kinds of
DVI cables. That is where I found a match for the DVI-D shape.

Apple makes an adapter for DVI computer to ADC monitor.

( product link shortened)

It is very hard to find truthful product information. This
is a picture of the Apple M8661LL in action. It has a wall
adapter, which provides the 24VDC the ADC monitor needs.
I don't know if I can find a good enough close-up shot,
to see the connector types.

This is another DVI to ADC solution, but again, we're
not allowed to see the adapter it uses. A 24VDC adapter
should be included with this, and probably plugs into
one of the cable ends.


Re: Re: Apple Desktop Monitor

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It does not have its own power cord!

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Not the case I'm thinking.
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Looks thataway.

I have this now.

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This is what I will need I guess.
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I don't know right now if I will ever want to run the Apple computer,
and its ADC output on a DVI monitor.  

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This is what I have now.

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Since it appears to NOT have power connector, I doubt this adapter
would connect my XP computer's DVI to the monitor's ADC, which doesn't
have its own power either,
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Thanx for the pics,  The DVI connector looks okay.  But alas, the
adapter has no power.

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Yeh, I have used this article in the past,
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This adapter seems to NOT have power either.

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This one appears to be what I would need,
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I agree, but it causes me to wonder if my video cards and their
present drivers will support the Apple monitor.  No point in spending
money for an adapter if my present computers won't support the

Thanks for your input.

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Re: Apple Desktop Monitor wrote:
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That is my mistake. I think the adapter turns out to be inside
the main "blob". The "blob" has pins for an AC power cord, so
the "blob" plugs into the wall.

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You can get virtually any resolution you want, within reason.
Powerstrip, from can be used. Mainly, that
works with ATI or Nvidia based video cards (and is less likely
to work with things like the GPU inside a laptop). Also, the
ATI and Nvidia control panels, may have provisions for custom
resolution settings.

The horizontal, vertical, front porch, back porch, are all supposed
to be programmable in hardware. This may be more evident, when using
Linux to run the computer hardware. Frequently, people are able to
achieve different and more useful results, while using Linux to drive a

In Windows, the limitation could be hard coded ones in the driver.
Some manufacturers of integrated GPUs, choose to not update
their drivers, to support new resolutions when needed. The
limitation may not be fixed by the hardware itself. It is
likely, that a couple hardware registers, hold the setting
for the number of pixels on horizontal and vertical.

A certain vintage of PC video cards, have out-of-spec DVI
outputs. The Wikipedia article on DVI, states what the
top resolution is for single link DVI. There are some
video cards, where the driver, on purpose, won't allow the
highest values to be used. It is because the hardware pad
drivers can't run fast enough, to support that resolution,
and the user would see "colored snow" if they allowed it.
Some cards may pass, some cards may fail. To "cover their tracks",
the drivers blocked the upper resolutions. And one driver writer
error, actually blocked a particular lower resolution value as
well, due to an arithmetic error. The vintage of card,
might be a DVI connector on something around the FX5200 era.
A couple of web sites tested this, using a Tektronix storage
scope and eye diagram software, to do pass-fail testing
of DVI outputs. Those sites have not done comparable
testing, in recent times (likely because all the cards
would pass, and they'd have no article to write).

For example, this card reaches 141MHz, short of the full 165MHz.
The orange signal, is not allowed to touch the three blue
compliance regions. Some cards only make it to 135MHz.,review-1128-18.html

This page shows some "eye failures", where the signal touches the
dark blue regions. The eye diagram software loaded into the scope,
is supposed to automatically adjust for correct amplitude, so there
should be no need for manual adjustments while doing these tests.
(And that is to prevent operator error, from screwing up the
pass or fail.) I've run similar software at work, and it's loads
of fun (I wasn't doing DVI though). Other I/O standards also
have eye diagrams like that, that must be met.,review-1128-11.html

So if a PC card lacks a certain resolution, it could be
the driver preventing you from seeing an out-of-spec output.
But equally well, it could just be lazy driver maintainers,
who don't want to support wide LCD screens, on old video
devices. If Powerstrip supports your hardware, that would be
the solution of last resort, after you've thoroughly checked
your video card drivers (and Googled for hacks to them).


Re: Apple Desktop Monitor

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Probably not the case, but could the 24 volts for the monitor be provided
from the USB supply via some kind of step up transformer within the unit?

Re: Apple Desktop Monitor

Tinkerer wrote:
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Too many watts. USB is only good for 5V @ 500mA. 2.5W would not run a 30W
which might be a typical spec for a small LCD monitor.


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