HP 3000 Manuals

Performing System Management Tasks

Components of the Series 920 Through Series 958 Systems 

The Series 920 through Series 958 systems are housed in a small cabinet.
The small rack-mount cabinet contains the system processor unit (SPU),
the CIO expander, and the battery backup unit (BBU). The cabinet can also
contain various peripherals.  If you are working with a Series 922 or a
Series 932 system, including the LX and RX models, please refer to HP 
3000 Series 922 Family Computer Systems/Operator Hand book (A1027-90019).


          Figure 12-3.  Series 920 Through Series 958 Systems 

Brief descriptions of the components of Series 920 through Series 958
systems are as follows:

   *   The SPU houses system cards (memory, peripheral, processor) and
       the power supply.

   *   A channel adapter or precision bus adapter (PBA) connects CIO
       devices.  The Series 948 and 958 systems also connect CIO devices
       through the Precision Bus Adapter (PBA).

   *   The battery backup unit (BBU) supplies power to memory cards in
       the event of a power failure.

   *   The operating system resides on the system disk once it has been
       installed.

   *   The system console is the device designated to send and receive
       system messages.

   *   One to four disk drives can be contained in the cabinetry.

   *   One digital data storage (DDS) cassette tape drive is contained in
       the cabinetry.

   *   Several types of page printers and line printers can connected to
       these systems.

MPE/iX 5.0 Documentation