202 MB SCSI Hard Drive  (25-4164)     Settings         Faxback Doc. # 5427

PREPARING THE HARD DRIVE

Carefully remove the drive from the protective packaging.  Store the
packaging in a safe place for future use.

Jumpers and pairs of jumper pins are near the connectors at the rear of the
drive.

A jumper is a clip that contains metal contacts.  To install a jumper,
  place it over two adjacent pins to connect or bypass a circuit.  You can
  install, remove, or park a jumper.

Before installing the drive, configure it for proper operation with your
computer.  To configure the drive, set the jumpers and terminators on the
drive to enable the features you want to use.  The following table lists
the jumper pin pairs and their functions.

If your SCSI host adapter has an external device connector, then your
system has two SCSI buses.  The SCSI drive you are installing will send and
receive data through the internal SCSI bus.  If you have an external SCSI
device connected, it sends and receives data through the external SCSI bus.
For proper SCSI operation, terminate the last device on each bus.

The 202 MB SCSI hard disk drive contains three resistor networks, or
terminators, that terminate the bus.  Be sure only the last device on the
SCSI bus contains the terminators.  Remove the terminators from the sockets
on the drive if this disk drive will not be the last SCSI device on the
bus.

The following diagram illustrates the jumper pin and terminator locations
on the SCSI drive:

JUMPER LOCATIONS

Four jumpers are shipped with the drive.  Three of these jumpers are parked
on pins 1, 3, and 5 of connector J5.  The fourth jumper is installed on
pins 7 and 8 of connector J5. The following diagram illustrates the
locations of all four jumpers.

              Enable Parity Jumper
        ┌────────────────────────────────┐
        │            ┌─┐                 │
        │   o    o   │o│   o    o    o   │
        │            │ │  ┌─┐  ┌─┐  ┌─┐  │
        │   o    o   │o│  │o│  │o│  │o│  │
        │            └─┘  │ │  │ │  │ │  │
        └─────────────────┴┬┴──┴┬┴──┴┬┴──┘
                           └────┼────┘
                                │
                                │
                          Parked Jumpers

DC POWER CONNECTOR (J3) PIN ASSIGNMENTS

PIN           POWER                     ┌─┐
                                        │1│
 1            +12 VDC                   │2│
 2            +12 VOLTS RETURN          │3│
 3            +5 VOLTS RETURN           │4│
 4            +5 VDC                    └─┘

TERMINATOR POWER SOURCE (J6) SELECTION SETTINGS
                                                 ───┬───────┬─── ┌───┬───┐
JUMPER        TERMINATION POWER                     │ o   o │    │ D │ C │
                                                    │       │    ├───┼───┤
A-B           Power from Power Connector            │ o   o │    │ B │ A │
A-C           Power from SCSI Bus                   └───────┘    └───┴───┘
A-B & B-D     Power from Power Connector
              and Provide to SCSI Bus
B-D           Only Provide to SCSI Bus

SCSI ID ADDRESS JUMPER (J5) SETTINGS

                   12 10  8  6  4  2
                   11  9  7  5  3  1   Pins 1-6 SCSI ID

SCSI ID - 0         o  o  o  o  o  o   1-2: Least Significant Bit
                    o  o  o  o  o  o

                                  ┌─┐
SCSI ID - 1         o  o  o  o  o │o│  3-4: Next Significant Bit
                    o  o  o  o  o │o│
                                  └─┘
                               ┌─┐
SCSI ID - 2         o  o  o  o │o│ o   5-6: Most Significant Bit
                    o  o  o  o │o│ o
                               └─┘
                               ┌─┐┌─┐
SCSI ID - 3         o  o  o  o │o││o│
                    o  o  o  o │o││o│
                               └─┘└─┘
                            ┌─┐
SCSI ID - 4         o  o  o │o│ o  o
                    o  o  o │o│ o  o
                            └─┘
                            ┌─┐   ┌─┐
SCSI ID - 5         o  o  o │o│ o │o│
                    o  o  o │o│ o │o│
                            └─┘   └─┘
                            ┌─┐┌─┐
SCSI ID - 6         o  o  o │o││o│ o
                    o  o  o │o││o│ o
                            └─┘└─┘
                            ┌─┐┌─┐┌─┐
SCSI ID - 7         o  o  o │o││o││o│
                    o  o  o │o││o││o│
                            └─┘└─┘└─┘
                         ┌─┐
Enable Parity       o  o │o│ o  o  o
                    o  o │o│ o  o  o
                         └─┘

Start/Stop          o  o  o  o  o  o
                    o  o  o  o  o  o


Ext. Spindle Syn.   o  o  o  o  o  o
                    o  o  o  o  o  o

(dkh/BKL-01/16/96)