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Sit rep: CPU utilisation problem is under investigation. It appears to be a Catalina only problem and does not affect Mojave users.  Will report back here once I have more news. In the meantime, if someone here is interested in following the detailed analysis, you can check out this thread on...

Okay, so limiting the Basilisk task to 60% with AppPolice seems to fix the overheating issue. Mouse movement is perhaps not as smooth (still definitely tolerable for an old OS) but at least the CPU isn't cooking itself to death.

Sweet! What's your config? Mine has an i9 9980HK with 32GB of RAM and a 5500M with 8GB of VRAM.  Asking this because Basilisk might work better with the i7 model. I'll check how many cores it uses and perhaps limit it on mine. Let me know how Basilisk works on yours! I find that Apple did a...

I recently bought a 16" MBP and since it comes with Catalina, I had to start over with all of the Apple emulators. Here's a sit rep (as of December 7th): - vMac: OK The custom variations service is no longer free (you have to donate $10 or more per year to have access to it). If you need a...

Sorry for the late reply.  D3 is indeed not listed on the schematics but there are a few instances of DP3 and DC3, which are also diodes, and more importantly they're of the same type: 1N4148. I'd go with this one instead of the 1N4001, but I'm no electrical engineer. 

I completely forgot about the SWIM on the SE/30 not being socketed... In that case I'd test the connection between every leg and its corresponding pad on the bottom or with a VIA.  Alcohol can help getting rid of residues such as cap goo etc. Use a Q tip or an old toothbrush to clean the legs. ...

I know this’ll sound stupid, but have you tried pulling the swim out of the socket and putting it back in? I’ve had a similar problem with one of my SEs. I thought the swim was a goner until I swapped it back and fourth with a known good one, and the defective chip started working fine again...

1987/88 EDs (ie 512Kes for Education) sold in Germany and the Netherlands were indeed platinum with "Macintosh ED" branding on the front. There is evidence online of a 220V platinum 512Ke with no label on the front. But it could have very well started out in life as a normal "Macintosh ED" and...

You need the patched version. The vanilla one won't work with this HD.  https://macintoshgarden.org/apps/apple-hd-sc-setup-753-patch I hope you have a Floppy EMU or a bridge mac to create 800k disks...

I've noticed that heavy duty aux. PSUs are rather heavy. I had found a 35A 5V industrial PSU but it weighted about two pounds... What kind of amperages can your FlexATX deliver? For a IIsi, power isn't a problem. 

The main issue with modern PSUs is that they can't really output more than 20A on the 5V rail. The old 800 PSU could do 30A, and the Delta unit in the 9x0s could do 33A. I know they probably don't need all that power at all times except perhaps if you intend to use them as an old school server...

Hi I wouldn't get caps from ebay or aliexpress if I were you. Most of them are probably fakes with a shiny enclosure. I'm in Europe and shipping/handling fees from sites such as Mouser or Digikey can be prohibitive. I use Arrow because they offer worldwide shipping on orders above 50 bucks (I...

I'd remove the old caps by cutting the top with some pliers (safer as ripping them off or twisting them I think), then immerge in some hot soapy water, scrub with a toothbrush. Rinse with clear water when done and rinse again but this time with isopropanol (this will effectively make the board...

The vertical lines in the first picture are definitely cap related. One of my boards produced the same patten before it was recapped (oddly enough it worked great without the accelerator, it only did this with the 50MHz Powercache 030...).  Don't forget to clean the board REALLY well with...

Hi If you had faulty voltage regulators, you'd most likely have nothing at all on the 5V or the 12V rails.  As ever with those old machines, caps fail. Even if they're not swollen it doesn't mean they're fine. Low voltage typically suggests weak caps, so recap first and if it still doesn't...

I’d remove the screws that hold the analog board in place, disconnect the logic board and the CRT neck board. That way you’ll be able to swing the analog board out of place without disconnecting the yoke and the flyback... giving you plenty of space to remove the PSU.

I think they're there to add a little more pressure onto the block but they serve no other function. As for the screws, you can go ahead and tighten them by hand (with a screwdriver of course). Don't over do/torque them though! It's not necessary as it doesn't support that much weight and you...

More than two years have passed... But here's a small update.  I recapped the 512k and the Hyperdrive PSU (albeit a few months ago) because both had gone bad. I was able to test the second hard drive (again) before the Mac died (again). This time, I'm suspecting one of the diodes on the analog...

@dcr I feel your pain. I too lost data of sentimental value... namely all 2GBs worth of my youth that were stored on our Windows 98 PC. All documents, pictures from our digital camera, wallpapers, save games, the lot.  We too did backups, on 5 CDs to be exact. 4 were CD-Rs, and #5 was a CD-RW...

He's still active. Check your PMs.