RAM is 32 bits wide.
The
cache fills
at
22
Mbytes
per
second.
The
architecture comprises
separate
system bus (memory)
and
I/O
busses. RAM is a
dual-port
design so
the
CPU
and
the
I/O
subsystem access RAM very nearly simultaneously,
without
contending for bus control.
System performance
is
enhanced by
the
MC68020 executing program code with minimal conflict
from
I/O
traffic
to
and
from
the
disc drive.
Board size for
the
processor, RAM
and
system interface
board
is
the
"System Board" size
of
the
Model 320. RAM
boards
provide
up
to
16
Mbytes
per
system slot. Two slots are available
for a
total
supported
physical RAM capacity of 32 Mbytes on
the
Model 350.
Computer
Packaging
Each is packaged in a Series 300 chassis like
t~e
Models 310
and
320. For most applications,
an
expander is not necessary due
to
higher integration of components.
The
computer
has four system slots for
the
processor, RAM board, system interface board,
and
video board. Each system slot is
part
of
the
new DIO-II 32-bit backplane. DIO-II is
made
up
of a two-connector system.
The
first is identical
to
the
Series 200/300 DIO connector. A
second,
or
DIO-II connector adds eight address lines, sixteen
data
lines
and
more control lines.
When used with
the
signals on
the
DIO connector, they allow 32-bit address
and
data
transfers.
DIO-II is designed
to
be compatible with DIO in two ways:
• DIO bus masters, like
the
DOS Co-processor,
can
talk
to
DIO-II boards.
• DIO-II bus masters like
the
processor
and
DMA on
the
systenl interface board, can
talk
to
DIO accessory
and
video cards.
System" Implementation
Figure 3-3 is a diagram
of
a typical configuration.
Processor
Board
• Model 330 -
16
MHz MC68020,
16
MHz MC68881 coprocessor, MC68851 PMMU, 4
Mbytes RAM.
• Model 350 -
25
MHz MC68020, 20 MHz MC68881 coprocessor,
custom
25
MHz MMU,
32-
KByte
cache.
RAM
Boards
The
following RAM boards are
supported
ONLY
in
the
computer:
•
HP
98258A 4 Mbyte RAM Controller Board (Model 330
or
350).
•
HP
98258B 4 Mbyte RAM Add-On Board (installed on
the
4 Mbyte RAM controller
board
in a Model 350 only).
•
HP
98258C
12
Mbyte RAM Add-On Board (installed on
the
4 Mbyte RAM controller
board
in a Model 350 only).
• Model 350 - Includes one 2-board 8 Mbyte assembly: one 4 Mbyte RAM Controller Board
with a 4 Mbyte
Add-On.
54
Functional Description
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