DVI, VGA, and firewire...

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doug-doug the mighty's picture
Joined: Apr 14 2004
Posts: 1355

I am planning a hardware hac involving a VGA monitor (pulled from a early iMac) and would like to know if there is any way to connect the disembodied monitor's VGA plug to something and get a video signal from either firewire or DVI (preferrably firewire). I would like to do either video mirroring or extended desktop. I need to know what hardware I would need to make this happen.

--DDTM

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--DDTM ('Fritter Critter' since Apr 26 2004 - 18:16)

'If it ain't broke, take it apart anyways. If you can't take it apart, break it so that you can fix it.'

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rael9's picture
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Joined: Dec 26 2003
Posts: 215
Well...

Assuming it is actually functioning as a monitor, DVI will work, but you will need a DVI to VGA adapter along the lines of this one. Also, IIRC the early iMacs have the wider Mac non-VGA plugs on the end, so you would need an adapter like these to adapt that.

AFAIK, Firewire is a no-go.

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James M. Baker
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[url=http://rael.webhop.org"]My site[/url]

Eudimorphodon's picture
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Also note...

As has been discussed many a time on the old Applefritter forums, that the monitor built into iMacs is *not* a full-featured VGA multisync monitor. It's fixed-frequency, and would frankly be something of a pain in the a** to use it with anything else.

(It requires non-standard horizontal and vertical sync timings, and won't lock onto normal "VESA" video modes.)

--Peace

rael9's picture
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Huh

Good to know.

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James M. Baker
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doug-doug the mighty's picture
Joined: Apr 14 2004
Posts: 1355
so...

...what should/could I use to drive a video signal to it?

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--DDTM ('Fritter Critter' since Apr 26 2004 - 18:16)

'If it ain't broke, take it apart anyways. If you can't take it apart, break it so that you can fix it.'

Eudimorphodon's picture
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Re: so...

doug-doug the mighty wrote:

...what should/could I use to drive a video signal to it?

In principle, most video cards *should* be able to drive it. The problem is getting the card to produce a mode the monitor would like. If you were driving it from a PC, for instance, you could probably use a utility such as "Powerstrip":

http://entechtaiwan.net/util/ps.shtm

Under Windows to program a custom video mode.

And of course, if you're a Linux/Unix/etc user, you could *probably* use the iMac-approprate "Modelines" provided with PPC Linux distributions to set up appropriate X and framebuffer consoles.

(One minor problem of course is that the monitor *won't* work until the OS has booted far enough to load your custom driver/modelines. So you'll be flying blind through the initialization stages.)

And, no, I don't know of a MacOS equivilent of "Powerstrip". It may exist, of course.

--Peace