I/O+ Boards; Figure B-12 Clock+ Board; Figure D-1 Board Slots And Ac Power Supply - Sun Microsystems Enterprise 3500 System Reference Manual

In most respects, all five board slots in the card cage are equivalent. However, slot 1
is the only slot that is physically connected in the card cage to the SCSI bus on the
centerplane. Slot 1 is therefore normally reserved for an I/O+ board, since the CPU/
Memory+ board does not have a SCSI bus controller.
D.2

I/O+ Boards

1. Requirement — Reserve slot 1 for an I/O+ board (
slot that allows direct access to the internal SCSI devices.
2. Maximum — Up to four graphics (UPA) cards are supported in a system.
3. Requirement — The SCSI bus on the I/O+ board in slot 1 must be terminated
because it connects to the internal system SCSI bus.
4. An I/O+ board in a slot other than slot 1 does not require termination if no
devices connect to the SCSI bus on that board.
Interface board (IB)
PPS/AC
FIGURE D-1
D-2 Sun Enterprise 3500 System Reference Manual • August 2001
Rear view
9 7
Board Slots and AC Power Supply
FIGURE D-1
5 3 1
). This is the only
Clock+ board
Five slots for I/O+ boards
and
CPU/Memory+ boards