I've been having issues with my SE/30 SCSI for awhile now. I've replaced F3 as that was bad and it didn't help the SCSI situation. I then replaced the SCSI chip with a modern Zilog one and made some progress. it would finally see SCSI devices, but would never boot to them. It would either hang on welcome to Macintosh, get a system bomb, or it says this disk was created with Minimal software and will not work on this Macintosh. Also I can't seem to get any floppy disks to boot from this as well as it just ejects them with the floppy X out on the screen. Im not sure what other areas to check on my board for bad traces etc. Any help appreciated.