Initio INI-9100UW - Manual (Page 22)

2-2
Getting Started
Host adapter and the SCSI bus
The INI-9100U/9100UW is a bus mastering host adapter which works with the
host computer to provide a means of control for the SCSI bus. By daisy
chaining peripheral devices together, up to seven devices can be linked with the
INI-9100U and up to fifteen devices can be linked with the INI-9100UW on the
SCSI bus. The host adapter can be placed in any physical position on the bus.
SCSI devices communicate on the bus using bus arbitration. Bus arbitration
gives each device an opportunity to use the bus based on the device priority on
the bus. This is determined by the device ID and not the device’s physical
location. The INI-9100U/9100UW’s ID is set at the factory with ID 7. This ID
positions the host adapter in an ideal position for single adapter environment
on the SCSI bus.
SCSI bus preparation
Each peripheral device that will be attached to the SCSI bus is either an
internal or external device. Each peripheral will have a specific device ID,
commonly referred to as a SCSI ID, which is set at the factory. Please refer to
your peripheral documentation to determine switch or jumper settings for SCSI
ID’s. A key point to remember is, no two devices can have the same ID. The
device ID uniquely defines the device to the SCSI bus.
When assigning a SCSI ID it is recommended to have the host adapter ID set at
ID 7, this is the factory default setting for the INI-9100U/9100UW. The exact
physical location of the device on the bus has no relationship to the SCSI ID of
the device. If you plan to boot your system from a SCSI disk drive, set that boot
drive at ID 0 for best operation with most operating systems. A second drive, if
used, can be set to ID 1 with additional devices using sequentially higher ID
numbers.