OTARI RADAR II, Operation Manual, Page: 220 / 261

A.4.6 External SCSI Device Installation
RADAR uses the SCSI interface standard both for internal operation and for
utilizing external resources, such as external hard disk drives. This paragraph
describes hookup instructions for both types of device.
A.4.6.1 SCSI Basics
SCSI (Small Computer System Interface) is a specification used for transmitting
data between a main computer host and various peripherals, allowing all the parts of
a computer system to communicate with one another. In our case, RADAR is the
computer host and the peripherals are hard disk drives, or a tape backup unit.
The external SCSI port on RADAR consists of a 50 pin connector to which you
may connect a SCSI cable to communicate with external SCSI devices.
The SCSI specification allows the host (RADAR’s CPU) to address up to 7 separate
devices. Remember that RADAR claims one SCSI device for each of its hard disks
or tape drive, and one for its internal SCSI controller (the CPU).
Each SCSI device has an identification number assigned to it that falls between 0
and 7. On stand alone SCSI devices this is usually set using a hardware switch.
RADAR's internal SCSI number assignments are set at the factory - SCSI ID7 is
reserved for RADAR’s CPU.
SCSI peripheral devices generally have two 50 pin connectors: an in and a thru.
This is done to allow chain connection of multiple devices. RADAR is the host and
as such needs only one connector.
Connected to the last device in a SCSI chain is a terminator plug. Physically, it
looks like a SCSI connector without a cable and electrically, it completes the loop
connection between all the devices in the chain.
IMPORTANT!
The SCSI terminator's importance cannot be overstated
- this must be connected for SCSI communication
between RADAR and any external devices to occur. If it
is left unconnected, there is the danger of losing audio
files or corrupting RADAR's file system.
H A R D W A R E / S O F T W A R E I N S T A L L A T I O N A-13
Edition 1