Adaptec 2100S - SCSI RAID Controller, Quick Start Manual, Page: 13 / 40

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High Only termination is available only for devices on Bus 0. Devices
on the second bus (Bus 1) must use 16-bit termination. By using a
68-pin to 50-pin SCSI cable adapter, an 8-bit SCSI device can be
attached to a Wide SCSI cable along with Wide SCSI devices. However,
the device at the end of the cable must be a Wide SCSI device so that all
SCSI signals are terminated. For internal and external cables where one
cable is an 8-bit (Narrow) SCSI cable, set the controller termination to
High Only .
The following illustration shows various SCSI cabling examples.
Terminate your SCSI devices as shown in the following examples,
ensuring that only the devices at the ends of the cables are terminated.