98561-66512
Processor
Board
General
Description
The
98561-66512 processor
board
has
the
following features:
• MC6840 Systenl Timer.
•
10
MHz MC68010 microprocessor.
•
Boot
ROM.
•
Eight Self-Test LEDs
• 1 M-byte of RA11,
• MCA2800ALS
RAM Controller.
• Memory
Management
Unit.
•
HP
-IB Interface.
• RS-232 Interface.
•
Bit-Mapped
Monochromatic Video
Output.
• HP-HIL
Keyboard
Electronics with
battery
backed-up Real
Time
Clock.
•
Miscellaneous
other
components
needed by
HP
Operating
Systems (HP-UX, Pascal, BA-
SIC).
Figure 3-9
is
a block
diagram
of
the
98561-66512 processor board. Refer
to
this
diagram
for
functional descriptions.
This
processor
is
the
same as
the
98561-66511 except for
the
amount
of
RAM.
RAM
One
M-byte
of
RAM
is contained
on
the
98561-66512
board.
This
RAM
has
optional
parity
and
is auto-locating
to
1 M-byte boundaries in
the
computer's
memory map. Auto-locating
means
the
processor's RAM will respond
to
1 M addresses
that
exists immediately below blocks
of addresses
the
accessory RAM
cards
are configured for.
This
block
of
addresses may also
be
between
the
addresses accessory RAM
cards
are configured for providing exactly 1 M addresses
exist.
If
accessory
RAM
cards are configured such
to
have
an
empty
section
of
RAM
of less
than
1 M addresses,
an
error
will occur during
the
turn-on
memory
test.
Functional Description
53
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