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If you dive deeper into that CheckLoopBack function, it looks like it only does the VIA1 PA0 check on the following models: Anything with boxFlag <= boxMacLC that doesn't have an OSS/FMC/Normandy decoder This would be II, IIx, IIcx, SE/30, IIci, Classic, IIsi, LC, and a few unreleased variants...

Thanks! Unfortunately, I don't have things fully figured out yet to the point I'd be comfortable selling completed boards. I was able to eventually repair my power supply briefly, but it's dead again right now. Q101 and D104 had blown when I installed the faulty riser board. Q101 got really hot...

Very cool! I was wondering if someone was going to make a ROM DIMM PCB to test it out. Swapping in some flash chips onto an existing board was a cool idea! @stynx how far did you go with testing the in-system programming? Were you testing with the TNT Flasher app? My understanding is there's a...

Wow! Nicely done! I never expected to see someone actually do it. Mind blown! :D

Does the power button on the back successfully turn it off, or do you have to pull the plug? If the power button works for shutting it off, that narrows down the problem significantly. The signal for choosing Special -> Shut Down comes from pin 60 of UE9, then feeds into UB13. The power button...

Looks like the output of an unused NAND gate. I don't see any traces coming out of the pad, so I think you should be totally safe to leave it alone. Schematics (page 16) confirm. Unconnected pads like this one are definitely easier to accidentally lift during desoldering. I've done it many...

Haha, I know the exact feeling! Thank you! Here are a few more updates on this project. I built up seven more riser boards over the weekend. It was a nice excuse to pull out the toaster oven and Reflowster. Reflowster was a Kickstarter project I backed in 2014. It does the temperature control...

Here's a link to my final IIsi PSU daughterboard replica design on GitHub. Feel free to do whatever you want with it; most of the credit goes to Bomarc honestly. I just did some sleuthing to figure out a few things Bomarc didn't, and fixed a couple of errors in their reverse engineered...

Thank you! The Bomarc schematic (which is fantastic and I heavily relied on for this project) has a few mistakes so it will be nice to have a fully correct schematic available for it. Thanks! I remember seeing your pictures of the two revisions while I was doing all my research. Very...

Update: My IIsi power supply riser board recreation project is pretty much complete. I soldered up the first one today using a stencil, solder paste, and hot air. (Added the two big caps afterward by hand). All parts on it are brand new from Digi-Key except for the obsolete ones: M51977FP (eBay)...

Ahh I see, I misread their explanation and missed the part under 7.1P2 where they said: Control panels "exercised" (opened and closed) during Custom Mac process.

Volume 3 has a restore for the Quadra 610 DOS Compatible (694-0268-B). It only includes a DOS 6.2 image though, no Windows. I do like the little caption in the Get Info window: "DOS for the rest of us".

Very interesting! I had noticed that note about compression in the past, but didn't think about the consequences of it in terms of preservation. I'll have to play around with different OS versions. I restored the 7.1P2 version for the Performa 450 from Volume 1, but I didn't find that the...

Thank you for your incredible effort to preserve these rare CDs! You likely have one of the very few remaining copies of this series in your possession. And it's complete! Thank you so much for your generosity of sharing these images with the entire community! As an example of the things you...

I haven't had time to tinker further with troubleshooting, but I thought I'd share the progress I've made on a IIsi power supply riser board recreation. This is probably the weirdest PCB I've ever laid out. I took a picture of the original and then traced everything on top of it. The pad and...

Because I'm crazy, I cobbled together a IIsi power supply tester. Probably good to have anyway if I'm planning on designing a replica riser board. It'll help me test and calibrate a new riser board without potentially damaging a motherboard. I just used a 20-pin ATX extension cable and cut it...

I wonder if mine sometimes briefly powering on and right back off when I initially plug it into AC power is a clue? That seems like it could potentially point toward some interaction between /PFW and the standby power, since I would think the caps would be fully drained at that point. I...

Here's a closer look at /PFW and +5V when the "turn back on" happens. (They're both perfectly overlapped so you can't see the marker for +5V, but it's yellow). The turned-off 5V rail has only dropped to about 1.2V when it powers back on. /PFW has gradually crept its way right to about the same...

Awesome and congrats! That's a clever way to put on the 10k resistor, I like it! I just want to be clear that I have no idea whether this 10k resistor is a good long term mod to make, or if there might be any bad side effects. I was mostly just doing it for diagnostics to get a feel for where...