Yet Another iMac Hack

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mac-man6's picture
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Joined: Jan 11 2006
Posts: 7

Hello everyone, after spending way too much on this project I’m really aching to get it finished. I have a iMac 350mhz slotload (no vga) motherboard and a 400mhz slotload (with VGA and firewire). I also have a 500mhz indigo iMac as well as my main machine, unhacked.

I have 3 areas of concern; power, video and firewire

I have two ATX power supplies ready to go and I have the proper molex connectors that I bought from Mouser.com. I’m tempted to follow this guys example and not use an inverter http://members.fortunecity.com/tinux1/sites/imac-atx.html. I’m going to be calling Mouser today so if I might be persuaded to go with soft power if you can help me find the part and convince me it’s easy. For power I have two options, simple and hard power or more difficult and soft power. (I suppose I just solder the wire to the pin and stick the pin the molex connector eh?)

I have a 20 pin ribbon ready to go. I plan on just running the computer headless and connecting with Timbuktu, I’ll put in a hard drive already configured for remote access. So I was thinking again I could go simple and just ground some pins and make the computer think there’s a monitor there or actually splice a VGA cable. Can any verify pins I would need to ground or connect together? This guy says 4 and 10 for 832x 624 http://pascal.monte.free.fr/imac/adapter.html .

Lastly firewire, the iMac adapter says it requires 15v, the highest I have is a 12v. Is it safe to use the 12v? http://www.webdrive.jp/mac/iMIU03e.htm

If you guys could help me with this I would be so grateful!

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Joined: Jan 20 2005
Posts: 700
firewire will run just fine o

firewire will run just fine on 12v. im not sure why the imac ran 15v for that.... i myself was going to do the atx mod but i lost interest when a B&W came my way.... hope it works out for ya.

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-Justin
(dead) PB100, Q650, PB Wallstreet, beige G3, Imac snow 600, Ibook g4, SE30, (dead) IIsi, TiBook 667VGA, PBg4 1.5, MDD dual 1.25ghz, 1.8ghz g5 tower.
OS7.5 to 10.3.9. I LOVE CLASSIC MACS!

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Joined: Oct 30 2005
Posts: 22
I've re-started a 400 mHz Indigo iMac...

On this page I reply to another iMac user on how I got mine to work.
I just today made a new video connector and will make a separate one for the 500 mHz.
I'll post pictures of the homemade power and video connectors in a separate post soon.

http://www.applefritter.com/node/9274

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iMac G3 400mhz, custom power supply, no case - yet

mac-man6's picture
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Joined: Jan 11 2006
Posts: 7
Thanks, that would be great.

Thanks, that would be great. I have a 20 pin cable, vga cable and a D Sub 15 socket. I was thinking of splicing the 20 pin to the VGA but I'm not sure how to know which cables connect to which pin, they might be colour coded but if not will I have borrow a electronic reader things and test each pin and cable and see which match?

Thanks again.