HP StorageWorks Ultrium 230 User's And Service Manual page 12

The 1/8 Tape Autoloader is NOT compatible with a standard differential (Diff) or High-Voltage
Differential (HVD) SCSI bus. The autoloader is compatible with a narrow (50-pin) SCSI bus using a
68-pin to 50-pin adapter that terminates the unused 18 pins (NOT included with the autoloader).
These adapters are sometimes labeled high-byte termination.
NOTE: HP does not recommend connecting any of the Ultrium or SDLT 320 Tape Autoloaders to a
50-pin adapter as this will degrade performance.
12 Installing the autoloader