Introduction
Major Components
The Series 900
computer
system
consists
of
modular
units
that
are installed
in
a stacked arrangement. These
modules
are
designed
to interconnect
with
a
vertical latching mechanism. The
maximum
number
of
modules
in
a single
stack is five. This can be:
0 a combination of
the
CPU
Module
and
one to three VME Expansion
Modules
and
one
to four SCSI Device Expansion Modules,
or
0
up
to five stand-alone SCSI Device Expansion modules.
There
are
three categories of modules:
0
CPUModule
where
the Applications Processor resides;
0 VME Expansion
Module
add-on
VME options
are
installed
in
this module;
0 SCSI Device Expansion
Module
contains fixed
and
removable
disk
drives.
CPU Module
The
CPU
Module
contains the single
board
computer, the
I/0
Distribution
board,
and
the
optional
modem.
This
module
has
four slots. The
top
or
first
slot
is reserved for the
I/0
Distribution board. The single
board
computer
is
normally
installed
in
the
second slot. The
remaining
slots
may
be
used
for
memory
expansion
or
VME options.
VME Expansion Module
The
VME Expansion
Module
houses
additional VME options
such
as
the
Serial
I/0
Controller, SCSI-2 controller, Ethernet LAN controller,
and
SNA, BSC,
X.25
Communications controllers. Each VME Expansion
Module
contains
four
VME expansion slots.
SCSI Device Expansion Module
1-2
The SCSI Device Expansion
Module
contains
four
half-height
peripheral
bays.
Two
bays
accommodate 3.5-inch
hard
disk drives
and
two
bays accommodate
either 3.5-inch
hard
disk
drives
or
half-height removable
media
devices.
Reference
Guide
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