input devices when you install software or copy data to your system. You
use tape cartridges and tapes as output devices when you copy software or
data from your system. You can copy individual files or programs or you
can copy (back up) the contents of an entire fixed disk. Tapes are commonly
used to archive data.
Mass Storage Controllers and Adapters
All mass storage devices require a controller, a device that controls activity
between the CPU and the mass storage devices. While the controller for a
DSSI device is built into the storage element, other storage options require
a controller module located in your system’s card cage. The controller for
the TK70 tape drive is the TQK70; the KDA50 is a controller for RA-series
disk drives. Each KDA50 controller supports up to four RA-series disk
drives.
The KZQSA adapter allows the CPU to communicate with the TLZ04 tape
drive or an RRD40-series compact disc drive. Each KZQSA adapter can
support up to two drives.
The CPU communicates with the ISEs through a Digital Storage Systems
Interconnect (DSSI) adapter, which is built into the CPU. A DSSI bus is
capable of supporting seven DSSI devices. A second and third DSSI bus can
be added to your system by using up to two KFQSA DSSI storage adapter
modules. Each KFQSA storage adapter can support up to seven RF-series
ISEs.
NOTE:
As of this printing, the KFQSA storage adapter does not yet support
the TF85 tape drive.
1.2.2.2 Mass Storage Subsystems
Several optional mass storage subsystems are available for VAX 4000
systems.
Such subsystems include RRD40-series Compact Disc Drive
Subsystems, the RV20 Optical Disk Subsystem, TSZ07, TSV05, and TU81E
tape drives, and the SA600 Storage Array (with up to eight RA90 disk
drives). If your system includes an optional mass storage subsystem, refer
to the user’s guide or owner’s manual for that subsystem for instructions
on how to operate the device.
1.2.2.3 Mass Storage Expanders
You can expand the mass storage and Q-bus capacity of your VAX 4000
system by using the following:
•
The R400X mass storage expander provides space for up to seven
additional RF-series ISEs or up to six RF-series ISEs and a tape drive
(TF85 or TLZ04).
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VAX 4000 Model 200 (BA430) Operation