Trumpcard SCSI card from IVS

[Amiga4k]

The IVS Trumpcard does not have SCSI jumpers.
The IVS Trumpcard Professional does have jumpers. If that is your card, set S0,S1,S2 to OFF (ID7) , and F1 to OFF (SCSI drive abritration). (I have no data on S3 jumper). Also set the Boot jumper to YES. Configure the SCSI ID on the drive to 6.

[Amiga4k]

What writing is on the card. Is there a version number?
Suggestion: Set it to 1.3 (boot). Set the SCSI jumper to 6. Try it. Also verify what SCSI ID your physical drive has. All SCSI drives have a jumper pads for setting the ID.
Most SCSI cards default to ID7. So, drives are setup as ID 0 thru 6. The SCSI bus reads from 6 to 0, so 6 is preferred for physical hard drives.
There maybe a problem with the card set to 6 and the drive set to 6, as this would be technically wrong. It should cause all types of havoc, and lockup the bus with the symptoms you said.