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We're not planning to support the LC series at this time as that requires -5vdc in order to operate correctly, and our board doesn't provide -5vdc.

Compgeke does the initial design in EAGLE and I follow up and do final tweaks in KiCad. Printing is done through PCBway who charges $22 for a run of 10 1oz copper boards and basically double that for 2oz copper.

It sure looks like you're going to need a new clock crystal. Anyone know what the value is? 

No luck there either. I'll be getting some boards over to Compgeke on Monday; he's got a lot more test equipment than I've got. In somewhat related news, I've noticed a layout issue where 5VSB to the Mac goes through one of the 680 ohm resistors for the inverter. That drops the voltage just...

I've tried adding a cap and a diode across PWR_ON and /PFW on the inverter, no luck there. The soft power bypass just shorts PWR_ON to GND on the ATX supply and it's only there for Macs whose soft power has failed.

On second thought, I'm wondering if the IIsi's soft power circuit does something a little bit weird and needs an HCT04 and different resistors. What I wouldn't give for a  scope right about now. I'll get some prototypes sent over to @Compgeke for evaluation and after that... Does anyone else...

Good news and bad news. Good news is that I got Rev 3 boards in today and they're looking great! Switching to Lite-On LEDs has also solved the problem of status lights being way too bright - I'm pretty sure those CREEs we bought last time were for things like emergency exit signs and not general...

This design is pretty much final; I don't think we're going to move to a transistor unless something drastic happens with the 7404. That said, there is a "just for fun" Micro edition of the adapter board, made almost entirely with SMT parts that does use a transistor. We'll see if that turns...

Good news - rev2 boards are in today! I've built a couple of them up for testing and here's what we've found: 74LS04 inverters don't work - they'll immediately cause the power supply to turn on as soon as they get 5VSB. 74HCT04s work as expected. The support holes for the Mac 10-pin plug...

I've been looking for an excuse to buy a SMD hot air gun. I feel like this is that excuse.

80 watt picoPSU - $30 on Amazon. Grab yourself a small 12v power brick from your favorite charity shop and wire it up to the original power socket, and you have a complete stealth PSU replacement. I tested the fit out with one of the early Rev1 boards in a IIsi case and when reusing the original...

We're just using what we have laying around to test, hence the full-size ATX PSUs. Eventually I'm going to switch over to a picoPSU once we get the final design nailed down. Using the original case and harness is up to you - want a tiny board with the 10-pin mounted straight to the PCB? Great...

Revision 2 is on its way... We're getting some of this design printed up and put together for testing. Hopefully we'll be able to start selling boards and kits to you soon!

You're fine, I meant more for how this thread became a Mac SE/30 PSU thread for a moment. What you see in the pictures is just me making do with scavenged parts. The final board will have a Mac II plug mounted directly to the board. We were considering using a picoPSU off this board so we could...

Getting back on-topic here, good news - the Rev1 boards arrived today! Unfortunately we already have a Rev2 in the works to address some problems we noticed in the Rev1 design (after I had already ordered those, naturally). But anyway, after a couple bodge wires they do work! We'll get the Rev2...

While I wait for the boards to ship, I went and hooked up my IIsi straight to an ATX power supply. Turns out the IIsi doesn't really like it if you don't connect +5VSB; thankfully there doesn't seem to be any damage. 

Hey all, just wanted to gauge community interest to see if anyone would be interested in an ATX to Mac 10-pin adapter board. I've got a IIsi with a dead power supply (surface mount caps got REALLY bad inside) and @Compgeke and I have been working on an adapter board that'll take any ATX power...

Far as I can tell nothing is overheating and solder joints are good. But, the board is littered with tantalums, and we all know how reliable those are...

Sounds like that's even more reason to get this board back up and running! First picture is of the 68020 half which is currently unpopulated as the 020 and FPU are in the Mac II at the moment. Picture two is of the 030 half. 

I recently picked up an early original Macintosh II which among other things came equipped with a SiClone Si3033 accelerator board. It's a two-part system with what looks to be a mostly passive board that houses the original 68020 and FPU and a second board that contains the 68030 and FPU. The...