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I was talking about replacing only the electronic board (that’s what an open frame PSU is). You just have to figure out how to mount the new board inside the original case and rewire the cables. No issue with the connector! I had already looked into it (but not done it, my Cube PSUs work fine)...

Wouldn’t it be cheaper and easier to replace the PSU by a modern one? They are more efficient and produce less heat. They’re more compact too: a modern open frame PSU could fit inside the original case of the Cube PSU.

Nixies are filled with gas I think, so the glass just need to be sealed. There’s a vacuum inside a CRT, the glass needs to be much more stronger. You absolutely don’t want it to break! (CRTs were routinely tested during the manufacturing process by dropping big steel balls on them)

The logic board in a TAM is from a PM 6500 (with a few ports missing or replaced), it is not that rare. Better check regularly for signs of leakage, as access to the board for visual inspection is really easy. But I would not attempt any repairs with a hot iron near the very precious TAM case...

Thanks for the photo. Is the chip on this card one that is found in PowerBooks?

RGB2HDMI needs to tap into digital videos signals, and is only 9 bits (?) for RGB. It is absolutely not suited for VGA signals.

Nobody’s ever opened a TAM keyboard, to see how it is interfaced?

It should be fine. That was a popular upgrade back in the day. I had one with the stock heatsink in my Cube for several years, never had a problem.

The part number on a 6200/75 motherboard is different, you can see it on this page: https://www.pvsm.ru/staroe-zhelezo/205527/ You have a 820-0685-B mobo, the 6200/75 is 820-0616-A

I have the same board, but mine is water and bad recap job damaged beyond repair, so I removed the heat sink to have a look at the processor:

I very doubt that 25 years ago someone had the tools and skills to do a processor swap, especially doing such a complex task for such small a reward, on a very low end consumer computer. So I think it’s a stock 6300 motherboard with a 603e processor at 100MHz (rounded up from the actual...

On page 27 of this book, about the Atari ST it says "Some software requires a doggel"… A doggel? What is a doggel, some sort of doggo? :p

CR2032s are 3 volts, you don’t want to use 3 of them. One and a half are enough! In fact you can use just one and it will work just fine.

Make it a dongle? The PCB would only have the VGA connector directly soldered to it, the DB-15 being connected to the PCB with a small cable. The DB-15 can then be a regular plug that won’t have any clearance problems. You’ll just need a way to firmly secure the cable coming from the DB-15 to...

If that can help, here are some photos of an Apple MPEG Media System card (that I sold recently):

@bigmessowires I was thinking if you use a microcontroller in your adapter, would there be a way to detect what kind of signals the Mac is sending, and have the microcontroller configure itself, so the adapter wouldn’t need any configuration switches, it would be completely automatic!

So… What about a Cube version ?… :giggle:

IIRC it’s one trace to cut, and one bridge to solder. The soldering is the easy part! It does not require any precision. Cutting on the other hand: you don’t want to slip! But it’s not in any way delicate work. And don’t pay 80 dollars just for one programmed ROM chip. It must be more like $20...

I’m a Cube enthusiast! I’ve just discovered this thread. I’m very much interested! So, how one does such a CPU swap? I’m guessing you need specialized soldering equipment?

A ROM 4X is a great upgrade: http://apple2.guidero.us/doku.php?id=projects:rom_4x_and_5x