SECTION
8. NUMERIC
COPROCESSOR
HP45977A
is
the Intel 80287 numeric coprocessor chip
that
enables
HP
Vedra
PC
to
perform high-speed mathematical
functions
with
seven
numeric data types. This section will provide
an
overview
to
the 80287.
For
detailed information on this chip
refer
to
the bibliography
for
source material.
The coprocessor works
in
parallel
with
the 80286 microprocessor.
The parallel operation increases execution speed by allowing the
coprocessor
to
do mathematical calculations while the
microprocessor continues
to
do other routines. Similar
to
the
80286, the 80287
has
two
operating modes.
Real-Address Operating
Mode
The system
is
in
real-address mode at power-up. An
I/O
write
to
port
OF1
H
with
D7
through
DO
equal
to
0 will reset the 80287,
and
also
place it
in
real-address mode. Real-address mode
of
the
80287
is
compatible
with
the 8087 numeric coprocessor
used
in
many industry standard personal computers.
Numeric Coprocessor 99
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