Hi!
It's the DB2 line, between pin 39 on the 53C80 chip (the uppermost pin on the right side) and pin 6 on the IDC-50 internal SCSI connector. It's also connected to pin 22 on the DB-25 external SCSI port, but there's perfect contact between both SCSI connectors -- I had put with my bare fingers a jumper between the chip's pin and the corresponding line of the IDC connector, and the SE/30 was able to read and boot from a CD on the external port!
I've been very busy these weeks, but I'll try as soon as possible to reflow (with my recently acquired hot air station) the SCSI chip, in case it's just a bad solder problem...
It's the DB2 line, between pin 39 on the 53C80 chip (the uppermost pin on the right side) and pin 6 on the IDC-50 internal SCSI connector. It's also connected to pin 22 on the DB-25 external SCSI port, but there's perfect contact between both SCSI connectors -- I had put with my bare fingers a jumper between the chip's pin and the corresponding line of the IDC connector, and the SE/30 was able to read and boot from a CD on the external port!
I've been very busy these weeks, but I'll try as soon as possible to reflow (with my recently acquired hot air station) the SCSI chip, in case it's just a bad solder problem...