Specifications

52 CHAPTER 4
THE ULTRA WIDE SCSI CONTROLLER
ADJUSTMENT OF THE SCSI-ID OF THE CONNECTED UNITS
For the distinction of different units, which are connected to the SCSI bus, SCSI units have a
so-called SCSI ID which can represent a value from 0-7 for Fast SCSI units and 0-15 for
WIDE SCSI units. The integrated SCSI controller on the CYBERSTORM PPC Accelerator
itself has the ID 7. This means that to one CYBERSTORM PPC SCSI up to 7 Fast SCSI
units with IDs 0-6 or up to 15 WIDE SCSI units with IDs 0-6 and 8-15 can be connected.
If multiple SCSI units shall be connected to the CYBERSTORM PPC SCSI, the SCSI IDs of
all these units have to be adjusted so that no unit has the same ID. The SCSI ID for external
SCSI units is generally adjustable with a small switch by the user. Herefore please consult
the documentation of the corresponding SCSI unit.
ATTENTION!
If two units are connected to the CYBERSTORM PPC SCSI with the same SCSI
ID, this could damage one of the SCSI units. In any case, only one unit is
recognized by the CYBERSTORM PPC SCSI software. Vice versa, if after the
connection of e.g. a new hard disk this unit is not recognized by the
CYBERSTORM PPC SCSI software, this may be a hint that possibly a SCSI ID is
adjusted at this unit, which is already occupied by another unit. The same is of
course also valid, if a new disk appears, but suddenly a earlier connected unit
can no longer be accesed. To avoid operation of two SCSI units with the same ID
in any case, you should check before the connection of a new SCSI unit with the
CYBERSTORM PPC SCSI software (e.g. the Program UnitControl) which SCSI
IDs are already assigned/occupied.
ADVICE
The sequence in which the SCSI IDs are assigned can principally be freely
chosen, i.e. neither must the SCSI IDs be assigned continuously, nor does the
selectable SCSI ID depend on the position of the unit in e.g. a series of
connected disks. Nevertheless it is recommended to assign the ID 0 to the first
connected unit, and to assign later connected units with the following IDs in
ascending sequence, as this can considerably shorten the system startup-time.
Exception to this rule is the connection of WIDE SCSI units for system that have
both Fast SCSI and WIDE SCSI units attached to the CYBERSTORM PPC SCSI.
To keep the SCSI IDs free for Fast SCSI units, which can only be set to 0-6, it is
recommended to assign IDs starting from 8 in ascending order for WIDE SCSI
units.
ATTENTION!
With some hard disks it could happen that they do not function properly on the
SCSI ID 0. In this special case, please change the SCSI ID on to any other ID.
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