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Maybe some form of era-appropriate PPC Linux? Tagging @demik. Yeah definitely since it's essentially just an earlier version of Mac OS X, based on OpenStep.

Those are inductors - for removing noise from the 5V rail.

Protection diode, very common failure part in these models - they short and prevent power-on. From what others have said on the forums, and my own experience, it’s safe to remove it and try powering on without it there (but plan to replace it soon). The exact value I’m sure has been stated here...

The RAM isn’t the main problem, it’s the architecture. Mac OS X needs Open Firmware, it’s fundamentally incompatible with anything Nubus/Slot Manager based.

It’s so weird that just that this one obscure model of the 5x00 AIOs was quietly specced as fixed frequency, when the rest of the series were multisync. Can we surmise that they were using up old monitor parts stock? To be honest, I run my Multisync 15AV display at 640x480 most of the time...

Open up the Monitors control panel and hit Options: You should get a dialog box like this.

It’s been highlighted that the 5260 is limited to 640x480 - a limitation of the analog board not the logic board.

Can you shed any light on the resolutions available? Are you limited to 640x480?

I've seen this with one of my 840AV boards, but I think it was a main RAM issue rather than VRAM - swapping modules/trying different slots made it go away. I don't recall if it was in Millions specifically.

Isn’t it Lupus - like the disease

Did you hack 9.2.2 onto it @frontein1 ?

You wouldn’t swap it out though, you’d piggy back two extra chips (with a flying wire for the chip select signal). The same technique is needed for the PowerMac 6500 boards to take them to 4MB. I might try this on a Rev. A iMac board that I’m not very precious about.

At the point it death chimes, the SE/30 exposes the Serial Test Manager over the modem port. If you hook up to another machine by serial cable and run a terminal emulator, the response code should tell you which 8-bit lane of the 32-bit memory bus is faulty, that way you can see which SIMM slot...

It was just during testing, it's all now buttoned up in a 540c chassis.

Appreciate the kudos! Tagging @jmacz @Callan @frontein1, as this mod may be of interest. Thanks also go to @terrier, who helped me work out which were the unused RAS lines.

Not at all, my pleasure. 48MB RAM mod writeup is now posted here: https://68kmla.org/bb/threads/48mb-in-a-powerbook-500-series-an-illustrated-guide.51585/

A few months ago, I worked out how to run 48MB in a PowerBook 500 Series. Inspiration was taken from Toyoki's 64MB mod for PPC upgraded 500-Series notebooks. The concept is similar – tap into unused RAS lines on the memory controller to bump maximum RAM above 36MB. You will need: A 32MB RAM...

@CC_333 OP has stolen your avatar!

https://68kmla.org/bb/members/zigzagjoe.25791/#profile-post-1326

Why not stick one on an accelerator and try for yourself?