Yamaha CD Recordable/Rewritable Drive CRW-F1SX Owner's Manual page 23

Termination
A terminator prevents the reflection of SCSI signals at the ends of a SCSI chain.
The terminators of the devices at the end of the SCSI chain are required to be set
to ON. If the CRW-F1SX drive is not at the end of the SCSI chain, the
TERMINATOR (SW 4) of the dip switch is required to be set to OFF.
External SCSI Device
CRW-F1SX
(Termination ON)
Termination ON (default)
Set to ON if the CRW-F1SX drive
is at the end of the SCSI chain
Note
The TERMINATOR (SW 4) of the dip switch is set at ON by default.
(Termination OFF)
Termination OFF
OFF
ON
Set to OFF if the CRW-F1SX drive
is not at the end of the SCSI chain
Computer
SCSI card
(terminated)
OFF
ON
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