Channel A Scsi Bus Termination; Channel B Scsi Bus Termination - NEC POWERMATE PROFESSIONAL 9000 Service Manual

1-34 Technical Information

Channel A SCSI Bus Termination

Terminate the extreme ends of the SCSI bus (cable), typically by connecting a terminated
device to the end connectors of the cable:
T
On the last connector of the internal cable (farthest from the system board), attach
either a terminated 16-bit device or some other type of 16-bit termination.
T
If the internal cable ends at the system board, enable system board termination in
the SCSI BIOS (on bootup, press
T
If the internal cable does not end at the system board, but continues on to the
external termination card, disable system board termination in the SCSI BIOS
(using the SCSISelect utility).
T
If an external SCSI cable is attached to the terminator card, the terminator card's
termination is disabled automatically. On the last connector of the external cable,
attach either a terminated 16-bit device or some other type of 16-bit termination.
When using 16-bit SCSI devices on channel A:
T
Use the onboard 68-pin Wide connector for cabling to 16-bit devices.
T
Enable termination only on the last device on the SCSI cable (internal and/or
external).
T
Remove or disable termination on all other devices.

Channel B SCSI Bus Termination

Terminate the extreme ends of the SCSI bus (cable), typically by connecting a terminated
device to the end connectors of the cable:
T
On the last connector of the internal cable (farthest from the system board), attach
either a terminated 16-bit device or some other type of 16-bit termination.
T
If the internal cable ends at the system board, enable system board termination in
the SCSI BIOS (on bootup, press
T
If the internal cable does not end at the system board, but continues on to the
external termination card, disable system board termination in the SCSI BIOS
(using the SCSISelect utility).
T
If an external SCSI cable is attached to the terminator card, the termination card's
termination is disabled automatically. On the last connector of the external cable,
attach either a terminated 16-bit device or some other type of 16-bit termination.
to enter the SCSISelect utility).
Ctrl A
Ctrl A to enter the SCSISelect utility).