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You can trim the plugs on an ATX extension cable.

Congratulations!

Huh? I thought the traces on the reloaded board were routed differently?

I think the A/UX version of HD SC Setup has always been able to initialise any drive; the patch for the standard version simply disables a check which only passes on Apple drives.

The schematic should be inside the BOMARC IIsi schematics document

Try with PLI formatter first. HD SC Setup usually refuses to initialise non-Apple drives. Best copy the PLI formatter and the System Folder from a Disk Tools disk to a spare floppy and boot from it. Then initialise the hard disk and reinstall the system software. I hope this all fits onto a 800k...

Did you try to initialise (not just format/erase) the drive? There is even a dedicated tool for PLI drives. Try using a patched version of Apple HD SC Setup or PLI formatter.

I doubt small movements of the arm really do matter.. How would the drive memorise the stepper position when the power is suddenly disconnected? Isn‘t this warning not just to warn not to rotate the arm beyond the sensor or prevent the heads inside the drive from slipping off the platters?

It should usually spin up. You need to lubricate the stepper motor bearing on these.

IIRC the script worked without issues on my modern Mac

DeRez‘ing a resource file is probably the way to go. It‘s probably also the easiest way to allow diffs of your commits/source files. Btw. Rez and DeRez are still part of modern macOS 😉

I sometimes also had the feeling the heat from desoldering strongly accelerates a chemical reaction during which the capacitor juice dissolves the PCB and therefore weakens the bonding of the copper to the PCB.

+1 for the twist method! Feels horrible, but never pulled a pad off this way!

You really need to recap your LC logic board, there is already substantial corrosion visible. The sooner you do it, the easier it is. I recapped my LC just a few days ago and it had less corrosion, but there was already some trace damage preventing keyboard and mouse from working. Luckily, I...

I recently recapped a TDK unit using the Console5 kit. The big capacitor didn‘t (quite) fit (I kept the original which was still ok) but the rest was quite enjoyable.. I prefer to recap as long as the PSU is not beyond repair because finding and fitting a replacement in a safe way is much more...

Do you have another BlueSCSI on you network? You can check the MAC address in your BlueSCSI configuration file.

Could you maybe reverse-engineer the behaviour from a network of several Macs running AIR (which we can consider as reference implementation) Or reverse-engineer from the Mac OS X AppleTalk stack?

I don‘t think so, at least one signal is different (brightness control PWM). Maybe you can rewire an ATX extension cable..