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It's been a while since I last posted anything here but I haven't given up. Far from it actually. I've made some board mock ups, identified the old original parts (reverse engineering connectors isn't easy, plus some of those parts are old and not manufactured anymore... but I've found some...

Got it, thanks. So if I go with the sata connector for the monitor board switching system, it'd only run two DC traces over to the relay's position (3.3 or 5V and DC ground), no planes are required here. The relay itself should be long enough to place a few of those slots or a large one. But...

Thanks a lot! The separation between the AC and DC side is indeed worrying me. I planned on using one of the sata connectors for the relay's coil. That has the advantage of completely isolating the AC from the DC board. But how exactly am I going to prevent shorts between AC and DC on the...

FYI, you can test the PSU on its own by shorting the blue (5V stb) and the white (Power ON, PFW) wires together. Unplug it from the Quadra first of course... I'd use a surge protector and/or a power strip with a switch to prevent any further damage. If it doesn't explode, you can test the...

I blindly thought that DPST switches only came in the 'thick' style. Apparently they can be slim too. I ordered the C13 switch and will let you know as soon as I get it if it's a DPST or just a SPST... Shouldn't make that much of a difference to be honest, but the former is theoretically safer...

You're welcome. Just keep in mind that unlike the over voltage protection "extension cord" for the C64 PSUs, it won't do anything to protect it against sudden AC spikes. And I think that's what kills most of them. So I wouldn't use the Quadra when it snows, when it's windy etc... or do the mod...

This just proves my point. Those original PSUs are dropping like flies and can't be trusted anymore. I think I just barely understand how they fail now (I did some research on the AC side of the mod today, the schematic is almost finished). I've read a few stories online about people pulling the...

Okay, I've done a quick mock up of how things are going to look. Because I haven't taken mine apart (yet), I've stolen one of Geekdot's pictures... (I hope that's all right with you, Geekdot!).  There are basically two ways to go in order to mount the new PSU's PCB:  1/ Make a metal adapter...

Well according to the spec sheet, the Noctua NF-F12 iPPC-2000 has a maximum power consumption of 0.1A... (mine's only a 3 pin BTW) So I guess it'll be safer to put a resistor (or better, two in parallel) for the 12V rail... I've got 256Mb now. It's a good thing the fan will be close to the...

Making an ATX case adapter would require too much metal work IMO. My plan is to reuse the original case without too many modifications (for example, I'd like to mount the new PSU without having to drill new standoffs, get posts/connectors for the original power plugs etc). But the original...

Now that you mention it (and that I took a closer look at the spec sheet), I can indeed confirm that I won't need a resistor for the 5V rail. I didn't notice there wasn't a minimum output current required for 5V-Standby. I just blindly assumed that both regular 5V and Standby power came from the...

Ladies and Gentlemen,  Today, I would like to talk about the rapidly decreasing population of working Quadra 9x0 (900 and 950) specimens. If no action is taken within the next 5 or 10 years, the entire specie will soon disappear. Although the exact cause of death is still unknown, most...

I learned the hard way with @ArmorAlley when we tried to recap LC PSUs that you can't 100% trust PSU cap lists (Turns out there can be major variations within the same brand/model). For the Classic alone, there are two board revisions which may have different caps. If you take into account the...

Yeah, I'd use brake cleaner as well to get it off. Try it on a small surface first (on the bottom for example), just in case...

I know I'm late to the party, but have you tried HFS Disk Maker? That's what I use when I want to transfer plain files between macOS (Catalina on host machine) and Mac OS (any version really, on mini vMac).  Basically, you just need to select a folder containing the files you want to...

I have 7.5.1 on my SE/30. Works well enough, I never felt the need to update to .5 Apparently, the Secret about box game only works on 7.5 (ie only on .0 and does not work on subsequent versions)...

Hi I'm currently trying to troubleshoot a 512K that has a bad 120V analog board.  The display keeps cutting out every half a second or so and it makes the dreaded flup flup noise. It happened out of the blue and when it's starting to get hot. The dead Mac scrolls points to bad CR20 &amp...

First I‘d try to remove what’s left of the crystal. There should be a couple of solder joints on the back side (if they’re not corroded to hell that is). Then get some white vinegar and scrub with an old toothbrush until you can’t see any of the brown stuff. Be careful of the RTC chip, you...

What Bibilit said + If your other machine is a 128k, another 512k or a Plus, you can switch around the ROMs to troubleshoot. Be sure not to put them on backwards...

Ok, problem solved. Since I didn't import my old config file from my old machine, I started over and couldn't find an extensive parameter list, so I completely forgot about 'idlewait'. IT TURNS OUT IT'S 100% NECESSARY. Now BasiliskII is only using 7% of my CPU.  Also, someone started working...