Recent content by jameswood

Good point!! I ended up buying another SE/30, which I managed to repair. I used some parts from the one above to fix it, then put the project aside while I hyperfixated on some other hobbies for a while (home networking, laser cutting, redesigning my workshop, etc etc.) I very much look forward...

Voltages at the logic board look good, and C2 isn't shorted to the too-close trace. I watched the address lines at startup. A5, A8, A15 and A17-19 appear to start out normally, then about 250ms after the reset, they all go high and stay there. After that it's all just blah. Now I think the...

OH!! That’s fantastic info, thank you so much. I’ll check out all the other things you mentioned as well, but this really makes so much sense. Perhaps when I accidentally shorted two ROM pins, I allowed the machine to move past whatever was blocking the boot process (but obviously it couldn’t...

I've removed, cleaned, reinstalled and tested all of the video multiplexer chips, and the problems remain. Perhaps one of them is bad, BUT: I was checking the address and data lines on the ROM itself with my scope last night and I shorted something out. Suddenly I had a perfect Sad Mac screen...

Oh, I also removed and socketed UI6 to try to track down the clock weirdness. The wave is now much sharper so perhaps it was partly due to dry solder joints on that chip. It seems the PAL works, which is nice 👍🏻

Good plan! Although I think it needs to be four at a time on an se/30, which I’ve tried, and none produce a boot chime. However! I decided to remove all the video multiplexing chips and, surely surprising to no-one, discovered they were in a lot worse shape than I’d thought. Dry solder, a...

Thank you! I don't know how to check whether or not it works in the SE/30, but it definitely all works in other machines

Hi there, this is my first thread and I’m looking for help already! My SE/30 is… not so well. As this is my first thread, I thought I might as well be relatively thorough, and also introduce myself a bit. I'll put the relevant photos of the machine and scope captures at the end. My Background...