I've tested LC PSUs with a multimeter under no load, though it was quite a long time ago.
As far as I remember, it worked fine - the voltages were a bit off relative to what it would be in circuit but I could at least check that it was producing about the right voltages.
This might help you get started:
You don't need the VIA thingy though, just press the debug switch early in boot to trigger death chimes. That should work.
As you've gathered already, the IIfx startup sequence is considerably more complicated than the 512k one :) .
The grey raster means that the first-stage initialisation code in the video card is running. This is also the same stage that on other graphics cards draws the vendor splash screen, so...
This is either the ImageWriter doing something a bit weird or the TashTalk transceiver doing something a bit weird; I hope you won't mind if I get out of the way and let you and @tashtari talk about this because at present my useful input in this conversation is going to be a bit limited!
There is, in retrocomputing hobby land, a slightly odd cachet attached to the SE/30 because it's the fastest compact, but it's not a deity the way some people seem to speak of it.
If you like the IIsi better, use the IIsi :)
I find my SE/30s interesting as hardware, partly because the...
Glad you're enjoying it!
That's really nifty. I enjoyed your blog post. Didn't know about the PocketCHIP before this, what a nice little thing.
The Err light on the LocalTalk side means either that a malformed packet has been received or that a lot of handshakes have been attempted in a...
This involves both precise timings and high voltages.
If you are not already intimately familiar with working with old CRTs, I would suggest not doing this. Destroying stuff on the AB is the best outcome you can reasonably expect if you just wade into it.
This is from memory, so bear with me and verify before absolutely trusting this information.
First of all, the display of the icon is under the control of the extension or control panel, not under the control of the OS. There's an agreed method for finding out where you should draw your icon...