8D77 (4-1) SCSI SE High Performance Internal/External I/O Controller FC
SCSI I/O Controller 4-1 FRU 31G9729
DL1,2 PE 23111 Delay Line
F1 1 A / 125 V Littelfuse (fast blow)
J1 High Availability Jumper
U1,5 Sony CXK58257AM-12L
U2 31G9727 SCSI BIOS?
U3 31G9725 SCSI BIOS?
U36 WDC WD33C93A
Y1 31.9500 MHz osc
Y2 39.95 MHz osc
Interrupt levels 3, 4, 5, 7, 10, 11, 12, 14
J1 (also called P3) High Availability Jumper
Must be out of the circuit for high availablity ("Y") configuration.
Put the jumpers over one row only so you don't loose them. There are 13
pairs of pins. You will need a 6 and 7 pair berg jumper (ganged jumper)
in order to use this for normal SCSI configuration..
SCSI HIGH-PERFORMANCE INTERNAL/EXTERNAL I/O CONTROLLER (#2828):
OK, what do we got?
o Accepts multiple commands per device SCSI chain
o SCSI burst 4.0MB per second (synchronous) SCSI-1
o SCSI initiator (command issuer)
o SCSI parity support
o One adapter per system
o Micro Channel Interface
- 4-byte (32-bit) Bus Master
Look at the MCA connector...
- Streaming data support
Good for a SCSI-1 adapter.
- Address and data parity support
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
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.