ATX PSU Conversion Mapping

[Floofies]

I recently got involved in reverse engineering the power architecture of the Quadra 630, in order to do an ATX PSU conversion. One thing I noticed is the large differences in component values between models, and implementations. Now I am very interested in finding out what the differences are and what causes them, so there is a definitive "map" of these conversions per-model. I will be making a chart/graph showing implementation differences between different conversion methods.

All I ask of the community is information. If you have done a conversion: what model Mac did you use, how did you do it, did it work, what were the specific components used, and their values? I'll also be compiling data from what I can find that's readily available, I expect I'll be taking a deep-dive into the snitz archive for this one.

 

[Trash80toHP_Mini]

Sweet! I got some links together in the ATX Gazette that may be helpful.

 

[Compgeke]

Powermac 8100/100 Prototype board, used a generic ATX PSU ripped from some small Asus box way back in the day. Wired it directly to a TI SN74HCT04N. No passive components needed and worked fine for this. Also confirmed working on a retail 8100/80 board. In another thread, people have mentioned using the HCT04N and no passive didn't work for them, at least on 68k systems.

Pic: http://i.imgur.com/7VBBABZ.jpg   \   http://i.imgur.com/7fMLTfI.jpg

The idea for this came from an old article detailing an 8600/9600 ATX conversion. Maybe there's something different about the 68k machines that stops this working?

 

[IlikeTech]

Quadra 650 with a 74LS04 inverter, with 2 1k resistors. I used a small Dell SFF PSU.

 

[Floofies]

Thanks for the information, folks.

 

[trag]

I wrote a short article for building an ATX to Umax S900 adapter a long time ago.   The idea being that you could just plug the adapter into your ATX supply, so the next time you need a replacement it's a plug and go operation, rather than a rewiring.

I think Kennedy put it up on his SuperMacs page (SuperMac Insider) as well.  The linked version may be a little more up to date.  I learned some things about Molex part numbers with time.  Nope, looks like Kennedy has the latest.

https://www.prismnet.com/~trag/Umax_ATX_PS_rev_2.sea.hqx

 

[Floofies]

Hi all, just writing to let you know I am still working on this. If anyone has any additional conversions they would like to share, I am still interested!