48
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 on the CYBERSTORM MKIII Accelerator itself has the
ID 7. This means that to one CYBERSTORM MKIII 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 MKIII 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 docu-
mentation of the corresponding SCSI unit.
ATTENTION!
If two units are connected to the CYBERSTORM MKIII SCSI with the same SCSI ID, this
could damage one of the SCSI units. In any case, only one unit is recognized by the CYBER-
STORM MKIII SCSI software. Vice versa, if after the connection of e.g. a new hard disk this
unit is not recognized by the CYBERSTORM MKIII SCSI software, this may be a hint that pos-
sibly 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 lon-
ger 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 MKIII SCSI software
(e.g. the Program Unit Control) which SCSI IDs are already assigned/occupied.
ADVICE
The sequence in which the SCSI IDs are assigned can principally be freely chosen, i.e. neit-
her 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 follo-
wing 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 MKIII 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.
THE SCSI SOFTWARE
Summary of Contents for CYBERSTORM MKIII
Page 1: ...ANWENDERHANDBUCH USERS MANUAL PAGES 29 55...
Page 29: ...NOTIZEN 27...
Page 57: ...55 NOTES...
