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I measured on the second line of pins starting from the rear of the machine. The rows are marked on the board, from 1 to 32, so I should have picked the right one. I was very surprised to see such a messy situation triggered by a simple voltage measurement, and I got very scared as at first the...

I wish you a smooth relocation, all the rest is now unimportant.

@JDW The meter is a Fluke, don’t remember by heart the model name, but it’s a recent one. By default, it works in auto range mode, so maybe this caused some fluctuation on the drained current which disturbed the CPU operations. However, I must admit it was very strange as the voltage rail...

So, I have tried the proposed hack (tapping +5V from PDS position A2 for feeding the BlueSCSI board and preventing the Wi-Fi crash), but strange (and scary!) things happened. At first, I just wanted to monitor the status of the A2 pin in different conditions (off, sleep, battery, PSU etc). So, I...

It’s a pack of 18650 cells. Doable, but not for everyone. https://davidigreen.com/blog/ibook-battery-rebuild

Yeah, not a very technical description, I must admit… I just go by heart, I must still have somewhere some diodes I bought for refurbishing a busted PSU rectifier. So, heavy duty, chunky ones. By the indications you shared, I should be able to source an appropriate component, hopefully on...

I see we're eventually converging, I also have collected evidence that an "always on" solution works (I used a bench PSU). Bar for the busted pico which is still a complete mystery to me, in the end we expereince the same issues. So, I will consider the proposed solution, however I only have PSU...

So, today I spent some time testing step by step different incremental configurations. System 6, System 7, with various HD drivers. Everything works fine, until the moment I add in to the picture the Wi-Fi thing. At that point the crash happens again (I guess the same situation already reported...

So, seems there’s light at the end of the tunnel… First off, if I use the same SCSI device on the external bus, everything works. So, it must be about the way the Portable is accessing the internal bus, which is likely managed by the software… and, bingo! When I use System 6.0.8, everything...

The Conner drive was specifically designed to be a SCSI 0 ID device, somehow hard locked. The internal connector on the Portable does not map the TPWR SCSI pin 26, I assume because there is no need. However, regular 50 pin SCSI devices do use this pin, including BlueSCSI. Now, the adapter I have...

I took my bench PSU and powered the BlueSCSI independently from the Portable. Issue gone: when the board is constantly powered up, there's no crash, I can put it on sleep and wake it up indefinitely. So, I'd conclude it's not just a matter of pull up resistors, but also about the way the Mac...

I don’t think the BlueSCSI board is damaged, it seems to work flawlessly. I just did some quick test measuring the voltage directly at the molex on the 5V rail. With the power supply connected, on wake up the voltage is restored only after the initial refresh of the desktop is completed (the...

Thanks for the clear explanation. I would like to have the time for deep diving into the complete documentation of Pico and BlueSCSI board, but indeed I don’t have any. I did the same check measuring 3V3 (OUT) pin. What happens is that it quickly goes to 3.3V on start up. When I put the Mac on...

Yes, I did measure GP19 and GP27 (video): aren’t those the two pins which should be kept up by the resistors?

I just did a quick check: first, I monitored the voltage at the GP19 pin. The voltage raises very quickly to 3.3V as soon as the Mac is trying to access the disk during boot sequence. It stays at 3.3V sharp all the time. When I put the Mac on sleep, it drops to 0V almost instantaneously. On wake...

Yes, correct. Data cable, tested working on other devices. Yes, out of the two I had (the plain Pico and the Pico W I successfully replaced like as soon as the Wi-Fi option became available), the plain one has the voltage regulator busted, the W one seems to output the correct voltage, but...

Good to know that. However, fact is that I could not program (not even mount) the Pico before desoldering it, cleaning the board, soldering it back, cleaning everything back again. By chance or not, it is now not missing a beat when I try to mount it on my Mac. Could have been something else...

So, I switch to this thread for sharing the latest updates about the issues I was having with the BlueSCSI v2 v2022.12a Wi Fi on my M5120 Portable. Brief recap: after attempting the pull up resistors mods for preventing the system from crashing upon wake up from sleep, my BlueSCSI unit just...

I also don’t think it’s an ESD issue. As for the 5-12V accidental swap, I also don’t think I did it, but - objectively - I noticed that it is *possible* to fit the power connector upside down, as there’s no connector casing, so to speak, just the four prongs, which of course are not offering any...

So, today the Pico W arrived. After updating the firmware I slotted it in the BS board. Now, when I try to boot the Portable off the BS board, the Pico flashes 5 times indicating that there‘s no (valid?) SD card. The images on the card are the same as before this little nightmare begun and they...