The SBus+ I/O board with 100 MB/sec Fibre Channel (Figure B-7) includes two SYSIO ASICs that provide two SBuses:
One for two plug-in SBus cards and two GBIC (100 MB/sec Fibre Channel) interfaces
One for one plug-in SBus card and the onboard devices (10/100 Mbit TPE and Single-ended Fast/Wide SCSI)
SBus connector slots 1 and 2 on the SBus+ I/O board can accommodate a double-wide SBus card.