Micropolis 1991AV-Models


Configuration and Jumper Options

SCSI ID Selection The SCSI ID (drive address) jumpers are identified as ID0, ID1, and ID2. 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 If terminators are installed at RN1 and RN2 (default), the drive provides termination for the SCSI interface. If the terminators are not installed, the drive does not provide interface termination. SCSI terminators are installed only in the end devices on the SCSI cable; remove the terminators from each of the other devices. The SCSI Host Adapter card and the last drive in the chain should have terminators.
Terminator Power W1 and W2 select the source of power (+5V) for terminators RN1 and RN2; W3 controls the drive supplying +5V to the bus.
   W1    W2    W3
Y N - Drive provides terminator power. (Default) N Y - Host provides terminator pwr via J1 pin 26 to RN1 and RN2
- - Y Drive supplies +5V to the bus via J1 pin 26. (Default)

Frame Ground Option A jumper at W9 selects the frame ground option.
    Jumper	Frame ground connected to logic ground.
    No Jumper	Frame ground not connected to logic ground. (Default)

Spindle Options Jumpers at SP0 (J2 pins 7 and 8) and SP1 (J2 pins 9 and 10) control the spindle options.
   SP0    SP1
     N      N     The drive starts the spindle motor at power-on. 
     Y      N     The drive waits for a Start Unit SCSI command
                       to start the spindle motor.
     N      Y     Spindle start-up is delayed based on SCSI ID 
                       address (12 seconds per ID)

Write Protect A jumper at WP (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)

Parity A jumper at PAR (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 Signals SSYNC (Pin 20) is the spindle sync output signal pin when the drive is mode selected to be the master drive. Pin 20 is the spindle sync input when the drive is mode selected to slave mode. MSYNC (Pin 18) is the spindle sync output when the drive is mode selected to master control mode. The odd-numbered pins opposite SSYNC and MSYNC are ground return lines for the corresponding signals.
Remote LED A user-supplied LED may be connected to Remote LED (J2 pin 21).