Scsi Bus Differences - HP Visualize b132L Owner's Manual

C_scsi.doc 171 Thu Jul 11 10:49:09 1996
CAUTION:
Table 18
Transfer Rate
Single-Ended
Up to 5 Mbytes
per second
Fast, Wide
Up to 20 Mbytes
per second
* Address 7 is reserved for host controller use on both buses.

SCSI Bus Differences

A Small Computer Systems Interface (SCSI) bus is an IEEE standard bus for
connecting your workstation to internal and external SCSI devices running
at different speeds, singly or in combination. Examples of these SCSI
devices are 4-mm DDS-format tape drives, CD-ROM drives, and Winches-
ter hard disk drives.
There are two types of SCSI buses available with this workstation - a single-
ended SCSI (SE SCSI) bus, and a fast, wide SCSI (FW SCSI) bus. Table 18
shows the specification differences between these SCSI buses, and Table 19
shows the SCSI addresses, ID numbers, and arbitration priorities for each.
Do not mix single-ended and fast, wide devices on any one bus type. Doing this will
cause a system failure.

SCSI Bus Differences

Data Bus Maximum
Width Addresses*
8 bits 8
16 bits 16
Device
Maximum
Physical
Cable Length
Location
6.0 meters Internal and
(19.6 feet) external
25 meters Internal
(82 feet) and
external
SCSI Connections
SCSI Bus Differences
Controller
Embedded
or Optional
Embedded
Optional
171