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I am now making the GWORLD RAM. At the moment the 1MB SIMMs do work and I will have them available very soon. Looking at the documentation is is also possible to get 4MB versions, but as of now I can only get them to be recognised as 1MB so I may need more work.

It's not just eBay indeed, but all online platforms that have to comply. I think eBay is taking a no risk approach though, because you should not need to open a German VAT if you sell below €10k/year, but eBay does bar you if you don't provide them with the number regardless. As for the LUCID...

Howdy, there's a lot of red tape now enforced by eBay to sell in Germany, even if you're within the EU. First you need to register a VAT number in Germany, and then register to the LUCID Verpackungsgesetz and pay for a yearly fee based on the estimate of shipping material trash that will end up...

SE/30 RAM sockets have very bad plastic retention clip and SIMMs can sit loose in them. My SIMMs are slightly thinner (1.20mm) than normal (1.27mm) which does not help on making good contact. They do work in the SE/30.

Schematics would not be very complicated but it would be a lot of work to do the PCB layout, using flash chips of this density require 3.3v, so you'd also need 5V to 3.3V level shifters on the data and address bus.

Getting back to you since you reached out from eBay, it is indeed fairly unusual to have a board without ROM, maybe you have a very early one? Your best chance would be to find a battery bombed motherboard and transfer the ROM from it. I'm not sure there would be a lot of incentives to create a...

Oh that's interesting, yes I don't have the Royal Tech VRM in my machine, still have to move forward with tracing the problem in my design...

That's a sweet little adapter!

I have 3 different models here, they are all interchangeable but they have different power ratings. Note that 040 machines likely needed the higher power output, it also depends of the hard drive and PDS expansion you plan to use, in order not to overload the supply. The -5V rail is generated...

The RAM is actually 16k of cache (MT is cache and IDT is for TAG)

Got these two from a scrapper, so yay for cloning!!!

List can also add RAM for PowerBook 100, 140/145/170, and 160/180 My designs are available on Tindie and on eBay :)

No one is talking about running wires all over the board. The original portable power supply was not very well designed from the start, with instabilities that could send VBat straight to the +5V rail (especially with bad capacitors) and weak current handling which makes it impossible to run it...

You could try fixing the pin, it would be difficult to swap the entire socket without doing reflow soldering with solder paste, but that's also possible.

Yup I have one of these! I have to fix the backlight but it does work :-)

That's rad and very promizing!

So I wend deep into the details on how voltages are generated and learned a few things. - The main +5V is generated using a MOSFET and a feedback loop with an op amp to drive the gate with a PWM signal. This can go wrong and is the reason why I'm seeing the hiccups on the power supply. When...

Unplug the hard disk, and dial current down to 400-500mA. It should power when you press the keyboard and display the floppy icon. Pretty much all the portables I have seen (well, 3 so far) have had supper finicky power supplies, but with the 5V hardwired like that it powers on rock solid. So it...

I have one here to work on. You can tie +5V to the heatsink of Q16 and ground to the battery ground. Make sure you have a regulated power supply, and set current limiting to make sure that nothing release the magic smoke. Note that this will power the entire +5V rail but not some other rails...

It could fit in 1/4th the footprint, so certainly in the volume of the module. It could also bypass some of the old power components and capacitors that are around the module.