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It’s surface mount on the 180

I don’t think anyone has tried this, you will have to experiment. As has been mentioned, the implementation of IDE on these Macs is very primitive and possibly non-compliant in a number of ways. Getting the cabling over to the 5.25” bay will be a big challenge, as has already been stated.

Yeah, I can't decide between the well-respected, trusted and experienced forum member, or the random website written by an unknown. Seriously, this person got a 68060 working in a Mac, which nobody else has been able to do. Listen to them. You're wasting everyone's time by asking the same...

Oh no wait it’s Lapis

Nothing is impossible if you believe.

How’s this going?

Thanks for correcting me, that makes sense. A monumental task, but not impossible - just improbable 😁

This part is the correct replacement, it’s significantly smaller in size than the original but can be made to fit: https://mou.sr/4ryPIXJ

Noted, and thanks :) You're right, the Reloaded name isn't quite correct for this project – don't want to be misleading, of course. OK! We should talk about the ROM side of things, curious to know how such a feature might work. In-system programmable?

There are three options that I see - 1/ Extend the footprint of the CPU card across the area usually reserved for the modem, and populate it with max RAM. 2/ Create a modern replacement RAM card that uses the standard footprint but with a readily available interconnect 3/ Harvest the original...

I want to bake in some improvements, like having 16MB (or even the full 48MB addressable) onboard, 550c ROMs in a smaller TSOP48 package, and possibly a programmable clock generator set with DIP switches (if there’s space left over). I'd make a few of these available with full 040 CPUs for sale...

Do you have a link or citation? Despite LEM's reputation for spreading misinformation, I searched the site and couldn't find anything.

It's common folklore that the connector for the CPU/Memory daughtercard of the PowerBook 500 Series was mysteriously discontinued back in the late 90's, preventing new upgrade cards from being manufactured. I've always just assumed it was true, given the many sources that cite this. Here are...

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.