Would this work to get ethernet connectivity under A/UX on an SE/30? I'm skeptical as I haven't been able to confirm that *any* of the existing SCSI to Ethernet adapters work under A/UX, but perhaps my information is incomplete.
Your problem sounds like something I also dealt with. It started with flashing and popping and changed into a completely black screen after a while. I also suspected a problem with the analog board. However it turns out that the analog board relies on the main board for a hsync/vsync signal, and...