HP C240 - Manual (Page 176)

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SCSI Connections
SCSI Restrictions
Connectors and Terminators
Any narrow, SE SCSI device connecting to the system must use a 50-pin
high-density thumb screw connector on the end connecting to the system
board.
Any fast, wide differential or ultra, wide-SE SCSI device connecting to the
system must use a 68-pin high-density thumb screw connector on both ends.
NOTICE The terminators for fast, wide differential SCSI and ultra, wide-SE SCSI
are different and not compatible, even though the connectors are identical.
It is necessary to put a terminator on empty SCSI connectors on the back
panel of the system. Also, a SCSI device attached to the SCSI bus or the last
external device connected to the SCSI bus must be terminated with a SCSI
terminator. If you do not already have a SCSI terminator, you must order ter-
minator C2904A (for 50-pin connectors) or C2905A (for 68-pin fast, wide
differential connectors) or C2972A (for 68-pin ultra, wide-SE connectors)
from Hewlett-Packard.