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SCSI Connections
SCSI Restrictions
CAUTION: Do not mix Narrow, Single-Ended SCSI, Fast, Wide Differential SCSI and Ultra,
Wide Single-Ended peripherals on the same bus.
Fast Wide Differential SCSI Bus Configuration Constraints
FWD SCSI devices do not work with NSE SCSI devices.
Table 20 shows the configuration constraints for each FWD SCSI device
type.
Table 19 Narrow-SE SCSI Bus Configuration Constraints
NSE SCSI Devices
Maximum Number of Each
Type of Device Allowed
Hard Disk Drives (two internal) 7
CD-ROM Drives (one internal) 1
4-mm DDS Tape Drives (one internal) 2
9-track Tape Drives 2
650-MB Magneto-Optical Drives 1
Magneto-Optical Autochangers (see notice below) 1
Maximum Number of NSE SCSI Devices 7
NOTICE: Magneto-Optical Autochangers use three NSE SCSI drive address. Each ad-
dress must be accounted for in the maximum number of SE SCSI devices al-
lowed.
Table 20 Fast, Wide Differential SCSI Bus Configuration Constraints
FWD SCSI Devices
Maximum Number of Each Type
of Device Allowed
FWD SCSI Disk Drive (two internal) 15
FWD SCSI Disk Arrays (addressed as single
drive)
7