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Good to know that the differences are minimal. One day I’ll tear down my TAM just to see by myself how they Frankensteined the whole thing!

Ooh, that’s interesting! It’s even interesting the other way around: if we could document the differences between a 5500/6500 logic board and a TAM one, it would allow to replace it more easily in case of failure or even make a 300MHz TAM! I will have a 5500 LB in a few days, found one cheap. I...

Im curious, why are you interested in those particular resistors?

Should I get my TAM out of his box? I won’t tear it down! ;)

They’re on the underside!? Here’s a picture of the underside of a 6500: it seems to me that R273 is near the bottom right corner of the square TI chip. (couldn’t find the other ones)

FWIW, there’s a picture of a (dusty) TAM motherboard on iFixit. Where are those resistors located? I couldn’t find them!

I’m sure many of you know this, but blue LEDs aren’t accurate for 80s and early 90s computers. They didn’t exists back in the day. There even was an issue of the electronics magazine Elektor in the late eighties (IIRC) that was asking on the front page wether we would see blue LEDs in the...

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.