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General
Information
Description
The computer
is
a 32-bit system with integral processor stack, power supply,
and
1/0 backplane
with seven
HP-CIO card slots. Other system assemblies include
an
ac power module, motherboard,
user-accessible service panel with switches
and
LEOs,
and
system control module. The system
control module contains the real-time clock
and
the operating system loader read-only memory
(ROM).
The computer has a
UNIX
operating system which
is
random-access memory
(RAM)
based
and
loaded from an external disc.
The computer processor consists of an
NMOS-III-based processor stack that at a minimum contains
a central processor unit
(CPU), an
I/O
processor (lOP),
and
memory assemblies. The CPU, lOP,
and
memory consist of NMOS-III chips.
All
cards reside
in
the stack
and
communicate via the
common memory processor bus
(MPB).
Cooling air
is
drawn through the stack between the boards to dissipate heat from the chips. The
boards are accessible from the front of the computer.
The
CPU chip
is
a microprogrammed 32-bit processor. The lOP chip interfaces to the system 1/0
bus. Each lOP supports eight select codes. Up to three lOPs can be included
in
the cornputer,
enabling a total of
24
select codes. The
RAM
chips are addressed by a memory controller chip that
corrects
all
single-bit errors. User memory ranges from 190K bytes to 10M bytes.
The
I/O cards are accessible from the rear of the computer.
The computer
is
housed
in
an 8.7S-inch System
II
rack enclosure (HP 9030)
or
in
a stand-alone
cabinet
(HP 9040). Directional references
in
the following paragraph to left
and
right refer to the
HP
9030; references to bottom
and
top refer to the HP 9040.
Three dc box fans provide cooling for the computer. The fans draw air through the left side (or
bottom)
and
exhaust the air
out
the right side (or top).
One
fan
is
integral to the processor stack
and
is
mounted at the left side (or bottom). The other fans are mounted to the chassis at the right side
(or top),
one
in
the power supply area
and
one
in
the
I/O
card cage area. The I/O card cage fan
operates at a constant speed. The other two fans are variable, increasing
in
speed
as the tempera-
ture increases. The computer shuts down
if the temperature rises to
100
c
C
in
the stack or to
97
c
C
in
the power supply.
Standard features include
CPU
and
lOP,
SOOK
bytes of
RAM,
seven HP-CIO slots, the internal
real-time clock,
an
operating system loader
ROM,
and
a customer-accessible fault diagnostic dis-
play (service panel).
Options include
one
or two additional CPUs,
one
or
two additional lOPs which
connect to
97098A I/O Expanders,
and
RAM
expansion to a maximum of 10M bytes (including
system
and
user memory). Refer to Appendix A (the Technical Data section) for additional informa-
tion
on
options.
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