Configuration and Jumper Options
The drive's circuit board will look like one of these drawings. Refer to the drawing that looks most like your board.
SCSI ID Selection
Jumpers at ID0, ID1, and ID2 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 out out out (factory default)
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 Terminator packs RN202, RN203, and RN204 provide termination for the SCSI interface lines. Default is RN202, RN203, and RN204 installed. SCSI terminators are installed only in the end devices on the SCSI cable; remove them from each of the other devices.
W201 positions 1-2 and 2-3 (or W1 and W2, respectively, on the lower board) select the source of terminator power (+5V) for the interface terminators. If a jumper is installed at W201 position 1-2 (W1) and no jumper is installed at position W201 2-3 (W2) (the factory default configuration), the drive provides terminator power. This configuration is used for PC/AT applications.
If no jumper is installed at W201 position 1-2 (W1) but a jumper is installed at W201 position 2-3 (W2), terminator power must be supplied by the host computer system via interface connector J1, pin 26.
W11 (only implemented on Rev C and later boards of the type in the lower drawing) allows the drive to supply interface termination power to the SCSI bus.
If W11 is not installed and W1 is installed (the factory default configuration), the drive does not supply SCSI bus interface termination power. W11 should not be installed for PC/AT applications.
A jumper at W5 controls the spindle option.
No Jumper The drive starts the spindle motor at power-on. (Default)
Jumper The drive waits for a Start Unit SCSI command to
start the motor.
Bus Parity Check
A jumper at W4 selects the bus parity check option. The drive always generates
parity regardless of this option.
Jumper SCSI interface parity checking disabled.
No Jumper SCSI interface parity checking on. (Default)
Frame Ground Option
A jumper at W21 (only implemented on Rev C and later boards of the type in the lower drawing) is used to connect the drive's logic ground to its frame ground. The factory default configuration, which should be used for PC/AT applications, is a jumper installed at W21.
Jumper Frame ground connected to logic ground.
No Jumper Frame ground not connected to logic ground. (Default)