For
HP
Internal Use Only
Multifunction 1/0
The
1v1ultifunction
Input/Output
(IviFIO)
card provides most of
the
core
I/0
functionality.
Different
MFIO cards are used
in
the
HP
3000
and
HP
9000 system configurations.
With
the
HP
3000,
the
SCSI, LAN
(ThinLan
and
AUI
ports),
Local Console, Remote Console, and UPS
connection
(through
the
CPU
card) functions are provided.
With
the
HP
9000,
the
SCSI,
Centronics, Local Console, Remote Console, UPS connection,
and
up
to
13
other
MUX
port
functions are provided. Refer
to
the
block
diagram
for
appropriate
path
addressing.
Embedded Peripherals
Several devices are
supported
in
the
SPU enclosure.
There
is room for two half-height
removable-media devices
and
two 3.5 inch fixed disk drives. Refer
to
the
appropriate
HP
3000
or
HP
9000 system configuration guide for a list
of
currently
supported
devices.
The
internal
devices are interconnected via
an
internal
SCSI
I/0
bus
that
is driven by
the
MFIO card.
The
last
device on
the
internal
bus (usually
the
primary
disk
if
present,
at
address six) must
terminate
that
end of
the
bus.
This
is usually provided by
the
installation
of
termination
resistor packs or
the
setting
of
a
jumper
to
enable termination.
The
SCSI bus also extends
outside
the
SPU via a connector on
the
MFIO card. This connector should also have a
terminator
installed unless
external
devices are connected providing
termination
at
the
LAST
device in
the
chain.
Power Subsystem
The
power supply
internal
to
the
SPU
provides DC power
to
all circuit boards
and
peripherals
installed
in
the
SPU.
It
accepts AC
input
(autoranging
to
110
or
230 V.A.C. levels)
and
provides
the
+5,
+12,
and
-12 DC voltages needed within
the
system.
There
are no
test
points
or
adjustments
on
the
power supply. A System Power Control Module
(SPCM)
board
located
within
the
supply provides control and monitoring
of
the
supply.
The
SPCM
informs
the
CPU
that
power is
in
or
out
of spec
and
signals
temperature
or impending power-loss
problems.
Uninterruptible Power System
These computers can use
an
optional Uninterruptible Power System
(UPS)
to
supply power
in
the
event of a power outage.
The
UPS is a standalone
product
that
is connected
to
the
AC
input
line source.
The
SPU
is
then
connected
to
the
UPS with
an
AC convenience cord
and
a serial
data
cable. If
an
AC power loss occurs,
the
UPS will continue
to
supply AC
to
the
SPU
for a minimum
of
15
minutes. In addition,
an
audible
alarm
tone
sounds, a LED lights
on
the
UPS front panel,
and
notification
of
the
power loss will
be
sent
to
the
SPU.
The
SPU
can
then
continue
to
run
and
monitor
the
UPS for
the
return
of main AC
input
power.
The
SPU
Operating
System software can be configured
to
gracefully shutdown
the
system within a
predetermined
time
if
the
UPS has not signaled
the
return
of power. Refer
to
the
appropriate
Operating
System
administration
manuals for details on how
to
control this feature.
9-4 Functional Description
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