Configuration and Jumper Options
SCSI ID Selection
Jumpers at ID0 (J2 pins 1 and 2), ID1 (J2 pins 3 and 4), and ID2 (J2 pins 5 and 6) select the SCSI address. Each SCSI device on one Host Adapter must have a unique address. ID selection is binary, as shown here.
SCSI ID ID2 ID1 ID0
0 (default) out out out
1 out out in
2 out in out
3 out in in
4 in out out
5 in out in
6 in in out
7 in in in
Interface Terminators at RN1, RN7, and RN8 provide termination for the SCSI interface lines. Default is the terminators installed. SCSI terminators are installed only in the end devices on the SCSI cable; remove them from each of the other devices.
Jumpers W1 and W2 select the source of terminator power (+5V) for the interface terminator. If a jumper is installed at W1 and no jumper is installed at W2 (the factory default configuration), the drive provides terminator power. This configuration is used for PC/AT applications.
If no jumper is installed at W1 but a jumper is installed at W2, terminator power must be supplied by the host computer system via interface connector J1, pin 26.
A jumper at W3 (J2 pins 7 and 8) controls the spindle option.
No Jumper The drive starts the spindle motor at power-on. This is
the Default configuration and is used for PC/AT
Jumper The drive waits for a Start Unit SCSI command to
start the motor.
Bus Parity Check
A jumper at W18 (J2 pins 9 an 10) selects the bus parity check option. The drive always generates
parity regardless of this option. Note that W18 is labeled "W9" on some 1370 boards.
Jumper SCSI interface parity checking disabled.
No Jumper SCSI interface parity checking on. This is the Default
configuration and is usually used for PC/AT applications;
verify the correct configuration required by your