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    Macintosh 68060 Redux

    Wow! Nicely done! I never expected to see someone actually do it. Mind blown! :D
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    I have a quick video that shows off the four different death chime variations on my IIci...

    I have a quick video that shows off the four different death chime variations on my IIci: Sounds like yours is Error4Handler. Unfortunately the leaked SuperMario source code doesn't explain the difference between Error3Handler and Error4Handler, so we'd probably have to disassemble the ROM to...
    • dougg3
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    IIci shutdown issue (It is now safe to switch off... message)

    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...
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    IIci shutdown issue (It is now safe to switch off... message)

    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...
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    IIsi power supply won't turn off, I'm deep in schematic land

    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...
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    IIsi power supply won't turn off, I'm deep in schematic land

    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...
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    IIsi power supply won't turn off, I'm deep in schematic land

    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...
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    IIsi power supply won't turn off, I'm deep in schematic land

    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)...
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    Restoration CD for market software

    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.
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    Restoration CD for market software

    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".
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    Restoration CD for market software

    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...
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    Restoration CD for market software

    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...
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    IIsi power supply won't turn off, I'm deep in schematic land

    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...
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    IIsi power supply won't turn off, I'm deep in schematic land

    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...
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    IIsi power supply won't turn off, I'm deep in schematic land

    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...
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    IIsi power supply won't turn off, I'm deep in schematic land

    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...
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    IIsi power supply won't turn off, I'm deep in schematic land

    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...
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    IIsi power supply won't turn off, I'm deep in schematic land

    Had a chance to look at this further. Agreed that this section of the circuit involves audio. I see a lot of 12V and -12V rail triangles in the schematic at that point. I'm still at a loss here. The "45" transistor is only involved with turning the power supply on or off. When it's on, the power...
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    IIsi power supply won't turn off, I'm deep in schematic land

    Oh no! Sorry to hear that! I'm on a lunch break so I can't look in detail until later tonight, but I can't imagine that resistor would cause this problem. All that pulldown should do is tweak the value of the existing pulldown resistor built into the 45 transistor, effectively requiring /PFW to...
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    IIsi power supply won't turn off, I'm deep in schematic land

    Haha, not a solder blob! :D Yeah, it's a little variable resistor or pot or something like that. If I'm reading my notes correctly, mine measured as about 2.106 kohms out of circuit, but I'd need to double check that before saying it confidently. Bomarc's schematic says 2K which makes me wonder...
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