[G4] Using ADC graphics card in Sawtooth G4

[Philip J Robar]

On Jul 11, 2006, at 12:01 AM, Derek Heeps wrote:

> I have a G4 450MHz AGP graphics 'Sawtooth' Powermac, currently with  
> the ATI Rage 128 graphics card which has VGA and DVI connectors.
>
> Just the other day I bought an Apple 15" LCD display with the ADC  
> connector as they are now very cheap on eBay. I also bought an ATI  
> Rage 128 Pro graphics card with VGA and ADC ports .
>
> On installing the card I found that the VGA port worked but the ADC  
> did not. On further investigation, I discovered that I was missing  
> the 24V supply to power the monitor, since my motherboard does not  
> have the connector to mate with the extra tag on the board .
>
> I presume, however, that rather than blow £70 on the Apple DVI to  
> ADC converter (which I know will work with my old graphics card),  
> all I have to do is connect a 24V power supply to the unused tags  
> on my graphics card. Has anyone ever done this, and does anyone  
> know the polarity of these tags?

I found a couple of sites that covered this while researching my  
earlier answers. I didn't save them, but a few minutes with your  
favorite search engine should find them. Try searching on "G4 mirror  
ADC". (Mirror because the guy used a Mirror Door power supply.)

Phil