Datasheet (from Romania!)
SCSI I/O Controller 4-1, FRU 31G9729
Interrupt levels 3, 4, 5, 7, 10, 11, 12, 14
J1 (also called P3) High Availability Jumper
SCSI HIGH-PERFORMANCE INTERNAL/EXTERNAL I/O CONTROLLER (#2828):
Stephan Goll says:
To make a summary: AIX has a database called ODM. In this database there are the definitions and suggestions for configuring all the cards not configured before IPL. Cards where AIX can boot from, well, shold be configured somehow, I believe by the ROS (or BIOS). Makes sense, because only the ROS knows from where the box can IPL. And remember, AIX uses a two stage boot process, first it boots in minimal mode, configures the cards using the ODM, and then it boots again with the system fully configured (so it is written in my AIX survivel guide).
Overload Protection and Terminator Power (Term Power)
The SCSI controller provides term power for the SCSI bus; connect devices to the bus so they do not provide term power. The controller uses a fuse that must be replaced after failure.
Do not connect or disconnect any SCSI device while power is on. Such “hot plugging” is forbidden because this practice may blow the controller fuse, corrupt data or permanently damage SCSI controller chips in controllers or devices.
The fuse on an SCSI controller protects the external and internal SCSI bus. The fuse may be blown by a defective cable, terminator, or device attached to the controller, but not by a defective controller.