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| ATX PSU Conversion Mapping |
Posted by: Floofies on 2017-09-03 11:02:46
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.
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Posted by: Trash80toHP_Mini on 2017-09-03 12:21:28
Sweet! I got some links together in the ATX Gazette that may be helpful.
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Posted by: Compgeke on 2017-09-03 12:31:22
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?
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Posted by: IlikeTech on 2017-09-03 13:10:41
Quadra 650 with a 74LS04 inverter, with 2 1k resistors. I used a small Dell SFF PSU.
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Posted by: Floofies on 2017-10-30 10:00:30
Thanks for the information, folks.
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Posted by: trag on 2017-10-30 12:04:48
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
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Posted by: Floofies on 2018-03-10 04:31:01
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!
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