User guide

SC35 User Guide Ver 4.8 August 30, 2002 Page 23 of 25
6.2 SCSI ID Selection
6.2.1 The SC35 can use any of the 8 SCSI IDs available on the SCSI bus,
although the highest priority device, SCSI ID 7, is usually reserved for the
initiator. Switch selection for each SCSI ID is shown below. For a setting
to be off, BOTH the switch and jumper must be off.
ID2 or E3 ID1 or E2 ID0 or E1 SCSI ID SELECTED
ON ON ON SCSI ID 0
ON ON OFF SCSI ID 1
ON OFF ON SCSI ID 2
ON OFF OFF SCSI ID 3
OFF ON ON SCSI ID 4
OFF ON OFF SCSI ID 5
OFF OFF ON SCSI ID 6
OFF OFF OFF SCSI ID 7
6.3 Write Protection
The WP switch of jumper is used to write protect the SC35. When the host
processor sends a write command, the condition of this switch is checked.
If the switch is on writes are disabled, and an error message will be
returned to the SCSI controller. Moving the switch to the off position will
enable writes on the board, allowing full read/write access to the memory
array.
6.4 Termination
Unlike previous versions of the SC35, Memtech now employs active
termination on SCSI drives. Termination is normally disabled on the drive.
To enable termination, install the jumper located at E5.
6.5 Jumper Definitions
Jumpers E6, E7 and E8 are used during initial testing at the factory and
should NOT be installed under normal operating conditions.
6.6 Memory Size
Memory size is determined when the SC35 is built and preformatted at the
factory. With some SCSI adapter cards the memory size is displayed when
the BIOS message is returned at power up. If that memory size changes,
contact Memtech factory repair. Memory capacity can only be upgraded at
the factory.