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@nathall – thanks, I will be asking around the group too; but it's a little more advanced than what we usually deal with, so casting the net wider seemed prudent. @cheesestraws – I totally hear you on the fuse thing, I learned just last month that a fuse can blow but still conduct current if...

I have a Power Mac G5 dual-core 2.3 GHz. Alas, when I first turned it on, it went CLICK and the power supply is now utterly stone dead. (Not even the little wire that's used for soft power switching has any voltage on it.) I can't find anything apparently wrong with it, and deep repairs on a...

This isn't _completely_ accurate, in that Power Mac G5s (as of the final iteration) could physically support up to 16 GiB when 64-bit addressing is active (i.e., for command-line software under Tiger, or in general under Leopard). I don't know whether there were any software limitations...

That's very helpful, thank you! I did indeed see that marking but had no idea how to trigger it. I shall investigate further. Hopefully without excess lightning bolts.

I'm actually not 100% certain that the problem is even IN the power supply. All I know is that the machine made a "snap" noise and went stone dead when I tried to power it on. (I'm going to feel very silly indeed if it turns out the two hours and change I spent extracting the PSU - a process...

This is a shot of the power supply board, looking from the end with the air-intake fans towards the end with the power-intake socket.

Does anyone have any idea what to look for inside a 710-watt PS from a "Late 2005" dual-core 2.3 GHz? Nothing in here looks scorched, discoloured, bulgy, or leaking. I can't find anything that looks like @Builder68's daughterboard with caps on it - there's a daughterboard of some sort in the...

I distinctly recall a discussion to the effect that some Apple software failed to set -- um. Either the EtherType or the SNAP packet type, can't remember. It cleared it instead of using the AppleTalk identifier, so wifi routers tended to drop them as invalid, or something to that effect. The...

I had one of those "back in the day" and was initially baffled that it didn't seem to work. I eventually determined, with outraged disgust, that they had failed to cross over the wires internally to the switchbox, so I had to hand-build a straight-through cable before I could do anything with...

Reading the Wikipedia summary of that, it's pretty clear that /srv is the correct place - it's for files and other data that the machine serves. If the shared file store was to be externally writeable, well, that would run counter to the stated semantics of the /srv directory - but it would...

Nicely done! I know you've already got something actually working and the point is now moot, but I _believe_ (haven't tried it out in person) that pretty much any transformer with a relatively equal winding ratio would have worked. The goal isn't to do anything fancy with pulse shapes or...

I'd also like to clarify, the whole "absurdly bloated list of peripherals" thing was meant as _examples_ - I kind of got stuck on the minor question, "just what _could_ I want to have portably hooked up to my KM switch?" Despite what I now see were appearances, I didn't mean to imply anything...

Ah, I see. That many people telling me "you misread that!" is a pretty solid hint. :¬) I also hasten to agree, you're each entirely correct; it was always a KM, not a KVM. I absent-mindedly used the wrong initialism as shorthand for the "dingus that remotely operates several machines from one...

Summarized, your original goal was a cross between "the poor man's lots-of-monitors" - which enslaves external computers to run them, rather than hosting an implausible number of on-board video cards - and a normal KVM. The combination would allow you simultaneous control of many machines via a...

Further thoughts: - Your original "magnetoisolator" should work just fine for the power-on function; if it isn't broken don't fix it. - Why would you need to speak two different protocols at once on the Mac? It's not complicated to convert edges to levels; a simple set/reset flip-flop on each...

Well, _ground_ is always connected AFAIK. It's only the V+ supply that might be absent depending on the powered-on-ness of the Mac. Edit: On machines with soft (keyboard) power-on, the ground & power lines are always powered far enough to tell whether that button has been pressed. That...

I haven't sat down and analyzed your proposed circuit. I doubt I really know enough to check your work to any meaningful extent. That said, if I were to undertake a similar project, I'd probably have started with the technique used in LocalTalk & PhoneNet dongles: a tiny little transformer...

Bwahahahah! That is an AWESOME illustrative parallel. :¬)

A bunch of small random thoughts emerge in response to this thread. In no real order: First topic (annoyingly long): I vaguely recall that Apple released two different serial cables in the early-Macintosh era (by which, in this case, I more or less mean "the span when at least some...