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The electrolytic inside these absolutely do need replaced. They also leak out onto the board but don’t cause nearly as much damage. Easy fix though - they aren’t surface mount.

Maybe it's been a while but we haven't have forgotten you! The PCB for the Macintosh IIc* is finished footprint wise, and I think we've got the components nailed down too. So, onwards with findings: 1.) ATX seems to not be ATX 100% of the time. By that I mean we've been thinking @blusnowkitty's...

More update: For get the whole voltage thing for now as I've now got two IIsi s confirmed working. Got a 2nd recapped and it's all rainbows and sunshine. And here's a video of it working:

That's just Mac OS being Mac OS. Anything prior to OS X does that really.

I got the IIsi board today, got it recapped and got it working. Some fun discoveries though. To start with, the IIsi is possibly special. By that I mean it's /pfw voltage for button press seems to be a bit different. Lemme make a list. IIsi I have here: 3.4v @blusnowkitty 's IIsi: 4.4v IIci...

Quadra 650 for sure. The cases are pretty reasonable despite being ugly. They run at 33 MHz and are (usually) a full '040. There's no reason to pay the extra cost for something like an 840 for an extra 7 MHz.  As a bonus only the power supplies need recapped - the motherboards are solid caps...

To expand a bit, the LC is a different thing all together. Physically this particular board won't fit within the LC PSU shell. The LC also doesn't require a /pfw inversion (they don't support soft power) and it uses -5V rather than -12V. We've talked about it and even have some plans however...

Of course, if you're working with other people I'd recommend using KiKad There's Eagle can be a bit special when exporting to work with other programs and break silkscreen text placement and those kind of goodies. That, and you'll lose all the device footprints and just get holes in general...

A few days late, but the third version boards finally showed up. Built and working 100% no issues for me on my test systems, a IIci, IIcx and a Quadra 650. As some bonus fun, I can now load up the systems and stay (barely) within tolerance on the 5V rail using only poverty spec 1oz copper. +/-...

So if we were to switch to a board using a transistor rather than the inverter (smart move really) here's something along the lines of what it'd come out like. With rearranging of the big stuff, I'm able to clear up even more space which adds even more free plane space between the power supply...

More progress tonight! I don't have the IIsi stuff or Rev 3 boards in the mail yet but I do have a transistor test setup. I can confirm everything works fine using a 2SC3904 NPN transistor and a couple resistors. It's built on a piece of solder breadboard with some machine pins soldered on so I...

I had an SE with a CR2032 mod that worked for over 2 years until I sold it. Still working at the time. I'll have to see how low a Mac SE will go before losing PRAM\clock settings with a bench PSU. It'll be a lot quicker than waiting for batteries to run down.

And as an alternative to that, anyone in the Bay Area or Sacramento Area have a IIsi I can borrow for testing? I'll even recap it for ya if it's not yet recapped as long as I can get something to test with :)  .

I managed to get V2 boards a day early and really early. Like check tracking when I got up and "Delivered: 6:54 AM". Electrically they work 100% fine. No need for bodge wires to make them work! 680 ohm resistors have gotten the 7404 to work properly, no matter which variant you install.  You'll...

In general the 9600 would be significantly slower than a G3 at most tasks. Plus it's still got SCSI and EDO ram.  I'd personally look into the G4 "Sawtooth" machines myself. They can also run 8.6 and are pretty reliable. Disk I/O is plain IDE, so you can just throw in an IDE -> SATA...

But he's already building in disk emulation support - negating the need for a SCSI2SD. 

The good news is I think I've got the 74LS04 issue sorted out ahead of time. Using the earlier test board I hacked up a super professional test jig and managed to get the 7404 and 74F04 working. I'd imagine the 74LS04 should also work now.  Something I might also play with is using an NPN...

It'll depend on which card. Typically it's a switch to select whether it's AUI, thin net or thick net . 

Okay another update: I managed to find another bug and fixed that. It wasn't a critical issue - it'd just limit you to 74HCT04s instead of being able to use a 74(L)S04. Being as the HCTs are the easiest to get working, I'd prefer 'em anyway but someone might have some LSs kicking around. I've...

So here's the thing: Fitting something with higher power is complicated(tm) due to space constraints. Apple didn't leave a lot of room for a power supply and your standard PC size form factors aren't the smallest things. Overall to fit (and be able to plug a mains cord in) you'd need to be...