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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!

Apologies if I am preaching to the choir, but revision A of the beige G3 logic board can't use slave drives, while B can. So I guess there are significant differences to the IDE controller between them...

No problem! No trace and no via means it's not connected to anything. I did a bombed 650 board (same board as 800) recently and most of the N/C pads were gone, and a couple of the connected pads needed some repair. All worked fine when I soldered the IC back on (along with some other repairs...

That pad is N/C. You can safely ignore it.

Can anyone recommend a suitable one? I'm afraid that whatever generic led I buy will be way too bright. The original was very subtle and I really hate bright glary leds so I'd like the replacement to be similar... Thanks.

I just use one of the below units configured as a wireless bridge connected to the computers ethernet. Works on any mac with ethernet and avoids all messing around with drivers and wifi configurations. Got a quadra 700 sitting next to me right now connected to my home network via one of these...

Is it possible? I am having no luck doing so. It will boot and load extensions, but freezes on the loading screen after the extensions have loaded before going to the desktop. With extensions disabled, it freezes in the same place just with no extensions loaded. I have the Sonnet firmware...

I was watching it on ebay too, and had the exact same intention of using the 601 card in my 700 if the 950 was truly a gonner - decided I didn't need any more projects in the end! Good to see it's in capable hands!

Hi, yeah the problem appears to be independent of the VRM - same on both. If you didn't see my other thread, I got it working with a wireless bridge instead of direct connection to the router. I don't know why, but it works now. On the heatspreader, I left the foil on the heatsink side, I just...