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That workaround “fix” solved the issue. I ran a jumper from pin 11 of the floppy cable to +5 on the BlueSCSI and now it wakes from sleep and drive activity works immediately. Not the best solution but it works!

It Looks like there's a pin on the floppy cable the provides +5v on wake up. If that would work without a current overload, I could make an adapter that the cable plugs into and then the adapter could plug into the floppy and supply +5 to the connector on the BlueSCSI.

What about tapping power from the board somewhere over to the BlueSCSI so power gets supplied to the BlueSCSI on wake up instead of hard drive spin up? I think that would fix it but I am not sure where the best place would be on the board to get the 5V from.

Right I saw what I could from the photo. My guess is that would be the same as my setup.

No luck here with a 10nf cap :( I noticed though a lot of the time after waking from sleep the BlueSCSI powers up AND the activity LED on on the main board flashes as well as the activity led on the pi pico once or twice and then it freezes. Heres the cap I tacked on to try it:

That’s sounds the same as ours then. Only difference is my power is supplied through the scsi cable

Thanks, I edited the last reply to you. Was wondering how you went about direct power to your BlueSCSI... did you tap directly into the battery? you have constant power to it even when you shut down?

Awesome thanks. I will put a .01uf cap on it and see how it goes.

Anyone know off hand which pins here are SEL and GND?

Ahh ok, that confirms why it is working for you. Are you tapped in directly to the battery?

Adding it to the 34pin to 50pin adapter would probably be best. Need to find a schematic.

ok I can try. I need to know which pin to add the cap (select pin) and find a gnd pin to connect to. This is the one I have: https://androda.work/product/bluescsi-v2-desktop/

Wow. almost seems like it could be voltage / current related...

Yeah, tested and confirmed. I am seeing the same results as you are. Do you think there's a way to fix and re-flash the pico?

I just powered the BlueSCSI with a micro USB to the Pi Pico and sure enough that solved the problem. So we've got a power up timing issue...

Ahh that makes sense. I was thinking earlier of powering the BlueSCSI externally. That won't work as a permanent fix of course since the battery would drain but I could try it here to see if it resolves the issue. Does it need both 5 and 12v?

I am using the HD0-OpenRetroSCSI-6.0.8-500M.hda pre made image found here: https://mega.nz/folder/8hA3AQCJ#pWUq92L70yDXlogy9lk5Dg/folder/ltAn0Y7Q Maybe put that on and SD card along with the Mac Plus ini here: https://ini.bluescsi.com/ and see if that causes a delay on your system?

Ok. Well it is socketed so I could try one of yours. Darn. Would love to get to the bottom of it.

hmm. I used one of the pre made images from the BlueSCSI GitHub page. Could possibly be the Hybrid board?

Interesting, so at least I know it's not an isolated issue to my machine only. But I am surprised no one else has mentioned this that I can find.