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For that sort of fault, my money is still on capacitors. Note that ESR testing is not 100% reliable! I work with CNC machines, some of them old, bad caps are fact of life for me. My typical approach when I suspect bad caps and have no schematic is just to brute force replace them all, but I...

I have a 16” Colour Display (currently dismantled in boxes waiting for a recap that has never happened) and a 17” Multiple Scan that I use as my daily driver on my Quadras. These two are almost identical form factors and both look great next to any Quadra or early powermac. The 16 is quite badly...

https://uk.rs-online.com/web/p/greases/7805284 That's what I have on the shelf right now, but only because I use ambersil products a lot at work. It's a pretty common product group that you should be able to find easily enough from a number of brands

I typically use some type of white silicon grease for such things as its generally kinder on plastics than lithium grease

Does this drive still work normally on another Mac? I corrupted at least one disk while messing with mine...

To answer the question directly (but not usefully), this is the kind of thing those RISC processor cards (I forget who made them or what silicon was onboard) would have been used for. Proprietary custom software of course, probably developed in-house by whoever had the need… I use my vintage...

i don‘t know, but that is very interesting because your board is now in the exact same state as my other wombat board, on which I have gone to quite significant lengths to get scsi working to no avail. This particular board was never battery bombed and I have never been near U63 on it, but it...

Great news, well done!

According to the Guide to Macintosh Family Hardware 2nd Edition, the RTC (at least on previous models) also contains the PRAM, so it makes sense that it would be accessed early in the boot process... On the other hand, the volume of the chime is stored in PRAM, so it must be reading that...

I don't think U63 has any direct connection to video, but it is presumably somehow instrumental in the early boot process as evidenced by my board with the same symptoms.

I'd remove the ram and vram simms while testing. Wombat has both onboard. After the chime, it does the memory test, then there should be a faint pop from the speaker, and then you should get video. I am curious if the behaviour changes if you remove U63 altogether. I have a wombat board on...

I know you were following my thread on TD about my wombat board dying in the ultrasonic cleaner and how I repaired it. If you reread, you’ll see those were the symptoms of mine too. Chime then nothing. If you are absolutely certain that U63 is working and that all it’s traces are connected...

I think the differences are trivial and easily "corrected". If you read the article that Unknown linked above they are detailed. There is another much older resource somewhere on the internet that details the differences too, but I forget where... Edit: Here...

Yes*, all you have to do is plug the led from a Q800 into the header that's in the corner of the board above the battery holder. It's a three pin header (IIRC) and two of them are jumpered on the plug for the LED. The boards are identical*, the rom/system software changes the gestalt value...

I must have missed that tidbit, thanks!

I wonder if the ability to cold boot from an unblessed volume is the different behaviour provided by a SM 4.3 host? Or does that come from the beta firmware? Do you know if the firmware be rolled back on these if updated?

Yes, that makes sense to me. Sir is correct, although as a Scot I don’t tend towards formality! I also don’t think any congratulations are in order as I didn’t do anything clever to achieve this. Lucky perhaps! The 700 is running 7.1.1, the 800 is running 8.1. Note I have only tried the...

I have some questions and thoughts about this. Contrary to most of what I have read about them, I have been successful in booting from both SE II and SE IV cards in my Quadras (700 and 800). In both cases there was no magic involved, just followed the instructions in the SEIV user manual and it...

Apologies for going a bit off-topic, but you two seem to know a bit about the FastCache Quadra and I haven't found much solid information about it before now. I have one, and installed in my Quadra 800 (modified 650 board, my original 800 board has dead SCSI right now so I can't test it in that...

Thanks for clearing that up, I assumed there were physical hardware differences beyond the gpu... I have a rev A G3 MT so was aware of the A-B differences, I didn't even know there was a rev C until now!