240 MB IDE Smartdrive (250-4126) Settings Faxback Doc. # 2168 Note: Refer to Faxback Doc. # 2172 for Board Layout. The SmartDrive has three pairs of jumper pins 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. This installation connects or bypasses a circuit, enabling or disabling a function. Drive Select (DS) Jumper: If the DS jumper is installed, the CS jumper must be removed. A jumper must be installed at the DS pins to configure the drive as a master. Cable Select (CS) Jumper: The CS pins should not be jumpered when installing this drive on your Tandy computer. Slave Present (SP) Jumper: The SP pins implement one of two possible configurations: * If the drive is configured as the master (DS pins are jumpered) and the SP pins are jumpered, this indicates a slave or secondary drive is installed. * If the drive is configured as the slave (DS pins are not jumpered) and the SP pins are jumpered, this enables the drive's self-seek test. The self- seek test executes seeks in a butterfly pattern to test the drive. The test will terminate if an error is encountered during self-seek testing. Note: The SP pins should NOT be jumpered if the secondary drive uses the Drive Active Slave Present (DASP) signal to indicate its presence to the master drive. Normally the SP pins should not be jumpered on the master drive. The following table summarizes the jumper settings: Jumper Function Setting DS Indicates that this drive is the master drive. Installed* Indicates that this drive is a slave drive Removed CS Not needed on Tandy computers. SP If DS is installed, then the drive is a master Installed and a second drive is present which does not use the DASP signal. If DS is removed, the drive is a slave and the drive's self-seek is enabled. The drive is a slave and self-seek is disabled. Removed* * Indicates default setting (dkh/jej-05/11/94)