Note: There are four versions of the SX4030 expansion module: SX4030W/1, SX4030UW/1,
SX4030W/2 and SX4030UW/2. The first two modules have a single SCSI connector (J5). This
adds one bus, supporting fifteen additional devices. Expansion modules SX4030W/2 and
SX4030UW/2 have two SCSI connectors (J5 and J6), supporting an 30 additional devices.