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1.2.1.5 Embedded DSSI Adapter
Your system has a Digital Storage System Interconnect (DSSI) adapter built
into the CPU. The DSSI adapter provides a DSSI bus through which the
CPU can communicate with the RF-series ISEs. A DSSI bus can support
seven RF-series ISEs.
1.2.1.6 Embedded SCSI Adapter
Your system has a Small Computer System Interface (SCSI) adapter built
into the CPU. The SCSI adapter provides a SCSI bus through which the
CPU can communicate with the RZ-series ISEs, TLZ04 tape drive, or
RRD40 compact disk drive. A SCSI bus can support up to seven devices.
1.2.2 Optional Components
System options can include multiples of components that are part of the
base system (for example, additional memory modules or ISEs) and the
following kinds of options:
•
Mass storage devices and controllers
•
Mass storage subsystems
•
Mass storage expanders
•
Communications controllers and adapters
•
Printer interfaces
1.2.2.1 Mass Storage Devices and Controllers
Mass storage devices record data on magnetic media. The data recorded is
not lost when you turn off the system, but can be altered or erased if you
record over the data. Use mass storage devices to store data and software
permanently. When the data or software is needed, the CPU transfers it
from the mass storage device into main memory. The two primary types of
mass storage devices are the RF-series or RZ-series ISEs, and devices with
removable media, such as tape cartridges and compact disks.
RF-Series Integrated Storage Elements (DSSI)
Up to four DSSI RF-series ISEs can be installed in your system. An ISE
is an intelligent storage device that contains its own controller. Special
mounting hardware allows the device to plug directly into the BA400-series
backplane.
RZ-Series Integrated Storage Elements (SCSI)
Up to four SCSI RZ-series ISEs can be installed in your system. RZ-series
ISEs deliver the capacity, speed, and dependability required by DECsystem
1–20 DECsystem 5500 Operation
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