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Can I just buy a card that was designed for Mac, or is there some incompatibilities I should know ?

I believe this PSU output voltage is (slightly) adjustable. You can have it output the proper 28V. But the Cube should be fine with only 27V: It converts it internally to 12, 5 and 3.3V

Everything has been figured out, except for the startup sequence? That is very unfortunate!

An open frame PSU will be smaller. You don’t need the shielding, the Cube PSU shell will provide it. The Mean Well EPP-400-27 will fit inside, I think: https://www.meanwell.com/webapp/product/search.aspx?prod=EPP-400

I don’t recall seeing a write up, but you basically just need to figure a way to mount the new PSU inside the shell and wire the connector as follows: A = +28V B = +28V C = Common (or - side of supply) D = Common (or - side of supply) the outer shell of the connector is ground

Another (more expensive) option is to replace the innards of the Cube PSU with a modern open frame 28V 8A (convection cooled) power supply. It will easily fit inside the original shell, be more efficient and produce less heat.

Thinking out loud, maybe the Linux guys figured it out? At least on the software side? Is there a Linux distro for the Mac that properly handle this monitor? With a software that allows you to change all the settings? Looking into the code will then allow you to figure out the protocol and maybe...

Why not buy a base model PowerMac G4 with ADC? You may be able to find one for cheap, and it will help you tremendously in your reverse engineering effort. It’s not the first time I’ve seen someone willing to use this monitor on a non-ADC computer, and it seems to be very difficult (no one has...

It’s from the factory, later Cubes don’t have it, but the chip (a voltage regulator) has a slightly different reference (LM2679 vs LMJ2679).

This is a common issue with Apple slot-loading drives of that era. The drives in G3 iMacs have the same problem. See this thread on this very forum! I have a Cube that was given to me with the same problem. One of the symptoms was that the Cube took a very long time to boot. But looking at the...

The problem may be related to how the joystick position is measured, depending on the hardware. On an actual Apple II it’s measured by a timer circuit (based on a NE555), and that allow the capacitor hack. (same capacitor hack to use common potentiometers, instead of the impossible to find 150kΩ...

No need to smooth it out, I think, the thermal paste will fill the grooves.

If there’s a drop-in flat panel replacement it will work in both the TAM and 3400. But the TAM doesn’t have the same space constraint as a PowerBook, and the LCD isn’t driven directly by the motherboard, it is connected to a driver board that is itself connected to the motherboard. It’s why I...

I was talking about the TAM’s motherboard. And by the way, the TAM is not a 3400, it’s a 5500.

Aren’t the motherboard video signals just VGA?

You should check the wiring of the board against your DVIator. AFAIK, a DVI to ADC adapter is just straight wiring of the DVI, USB & power lines to the ADC connector. As to VGA to ADC, this one is (very) complicated. IIRC Apple cheaped out on the 17" Studio Display CRT by not implementing...

Enjoy your Cube! They’re awesome little machines.

I don’t think the ADC power goes through the DC-DC board. It goes through the short cable that goes from the motherboard to the AGP riser card. The connector for this short cable on the motherboard is directly wired to the power supply plug of the Cube. I think it may be a problem with the...

IIRC there’s a direct feed from the power supply plug on the cube to the power lines of the ADC connector on the video card. Meaning that the Cube doesn’t manage the ADC power at all.

Did you test it with another monitor? Maybe the issue is not with the Cube…