1-2
General
Information
Table 1-1.
Computer
Service Documentation
Manual Title
Part Number
98770A Color Graphics Display Service Manual 98770-90031
98780A
Monochromatic Display Service Manual
98780-90030
9130K
Flexible
Disc
Drive Service Manual
09130-90030
Note
If you are unfamiliar with the computer, read the Installation
and
Test
Manual contained
in
Appendix B of this manual.
Description
The computer
is
a 32-bit system with integral processor stack, power supply, ac module, keyboard,
display, printer, mass memory, and input/output
(I/O)
backplane. The printer and mass memory
are optional assemblies.
The computer has
one
of two operating systems: BASIC or
UNIX.
Both systems are random-access
memory
(RAM)
based and loaded from
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 boards reside
in
the stack and communicate via the common memory
processor bus
(MPB).
The boards may
be
finstrates or polystrates. Finstrates are copper cored boards with the NMOS
chips
bonded
to them. They provide the combined functions of cooling
fins
and ceramic substrates.
Cooling air
is
drawn through the stack between the boards to dissipate heat from the chips. The
boards are accessible from the left side of the computer.
Polystrates (from polyimide and finstrate) are polyimide boards without the copper core. However,
copper heat sinks are mounted on the circuit side of the boards, to dissipate heat from the chips.
The
CPU chip
is
a microprogrammed 32-bit processor. The lOP chip interfaces to the system I/O
bus. Each lOP supports eight select codes.
Up
to three lOPs can
be
included
in
the computer. The
RAM
chips are addressed by a memory controller chip that corrects
all
single-bit errors. Memory
can
be
made up of 256K, 512K, or 1 Megabyte
RAM
memory boards
(1M
byte
RAM
boards must
be
used
in
pairs).
The mainframe includes the motherboard,
I/O
backplane, interconnecting cables, power supply,
and three cooling fans. The top covers, side covers, and keyboard bezel are also part of the basic
computer.
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