Hi All,
I post my lines here, just to avoid creating too many threads.
Issue: in one of those stupid moments which unfortunately are part of any tinkerer experience, today it just happened that I made a totally idiotic thing and apparently I busted something on my beloved SE/30 logic board.
Root cause: I connected an external “naked” floppy and didn’t notice the metal cage I used as stand up was actually shorting the floppy connector on the logic board side. Yes, very stupid. So, when I powered the Mac, after the first “boing” it instantly rebooted, because of the short. As I realized the issue, I immediately switched it off, but it was too late.
The floppy drive is still OK (tested working with some other Mac), but when I attach it to the SE/30 via the external connector, I get some weird error, like “Can’t format this disk, as it’s write protected”, even If the floppy is empty. So, something got busted. The good news, though, is that when I connect the floppy to the internal connector, everything works fine. So, I would guess it’s not the SWIM chip that got busted, but it shall be something upstream the internal floppy connector, which narrows down the possibilities to the filter circuits RP10.
Either way, I may have access to a donor board, but before starting pulling chips and stuff, I’d appreciate having the opinion of real experts about any other potential cause of failure.
Thanks in advance for your feedback!