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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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