Micropolis 1908-Models


Configuration and Jumper Options

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.
0 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 (Default) in in in

Interface Termination Interface terminator RN6 provides termination for the SCSI interface lines. Default is RN6 installed. SCSI terminators are installed only in the end devices on the SCSI cable; remove them from each of the other devices.
Terminator Power W1 and W2 select the source of power (+5V) for terminator RN6; W12 controls the drive supplying +5V to the bus.
   W1   W2   W12
Y N - Drive provides terminator power. (Default) N Y - Host provides terminator pwr via J1 pin 26 to RN4 and RN5.
Y - Y Drive supplies +5V to RN6 and to the bus via J1 pin 26.

Spindle Control A jumper at J2 pins 7 and 8 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.

Write Protect Option A jumper at J2 pins 11 and 12 selects the Write Protect Option.
    Jumper	The drive is Write Protected.
    No Jumper	The drive is not Write Protected. (Default)

Bus Parity Check A jumper at J2 pins 13 and 14 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)

Spindle Sync Termination Jumpers at W8 and W9 control spindle sync termination. This depends on system configuration; i.e., Master Mode or Master Controller Mode. This function is not used for PC/AT applications.
    W8    W9
    Yes   Yes    Slave and Master Sync are terminated.
    No    No     Spindle sync not terminated. (Default)

Frame Ground Option A jumper at W11 selects the frame ground option.
    Jumper	Frame ground connected to logic ground.
    No Jumper	Frame ground not connected to logic ground. (Default)