Unsupported Accessories
The
following accessories are
not
supported
in Models 330/350
computer
systems:
•
HP
98254A 64
Kbyte
RAM Card.
•
HP
98256A 256
Kbyte
RAM Card.
•
HP
98257 A 1 Mbyte RAM Card.
•
HP
98603A ROM BASIC 4.0.
•
HP
98603C ROM BASIC 5.0.
•
HP
98620A Two-Channel DMA Interface.
•
HP
98635A Floating-Point
Math
Card.
•
98561-66531
Human
Interface Card.
Model 350 Processor Board
A new high-performance processor
board
is used in
the
Model 350.
This
board
uses
the
25
MHz
MC68020 processor
and
the
20 MHz MC68881 floating point co-processor.
It
also contains a 32
Kbyte high-speed
instruction/data
cache, a memory management unit, a MC6840 timer,
and
two Boot ROMs.
Model 330 Processor Board
On this processor board,
the
MC68020
CPU
and
MC68881 co-CPU are clocked
at
16
MHz.
Although no cache is used,
the
MC68851 memory management unit
is.
On-board
RAM of 4
Mbytes makes
the
Model 330 processor
board
powerful in its own right. RAM control
and
byte
parity is sinlilar
to
the
4 Mbyte RAM Controller Board.
Timer, Boot
ROMs,
and
self-test LEDs are
the
same as
the
Model 350, as well as
the
same
DIO-II
and
DIO bus capability. A system bus
cannot
used on
the
Model 330, therefore memory
cycles will be slower
than
the
Model 350.
Model 350 System Bus
On
the
Model 350 back panel, you will notice
the
cover
plate
over
the
processor
and
memory
boards has a connector
board
mounted inside. This connector provides a high-speed memory
bus between
the
Model 350 processor
board
and
one
or
two RAM controller boards.
This
"connectorized" cover
plate
is called
the
system bus.
Model 350 RAM is tightly coupled
to
the
Model 350 processor
through
the
system bus.
This
allows much faster memory cycles
and
larger memory boards.
It
supports
both
32-bit address
and
data.
It
also
supports
16
byte cache line sustained read cycles
at
over
22
Mbytes/second.
Single write-cycle sustained transfer
rate
on
the
system
bus
is 14.3 Mbytes/second.
Memory Boards
Each 4 M[byte RAM Controller Board,
and
optional 4
or
12
Mbyte add-on board, uses one
system slot.
With
this arrangement,
4,
8,
or
16
Mbyte RAM assemblies are provided.
The
maximum
amount
of RAM in
the
system is limited
to
32 Mbytes in a Model 350
and
8 Mbytes
in
the
Model
3:30,
Configuration is set by switches on
the
RAM controller
board
and
Model 330
processor board.
Functional Description
57
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