Alternate
use
of both switches
Both
the hardware and the software switches
may be
used
alternatively, but this
is
not
advised
because
you
may
become confused about the mode
of
operation.
When using both
switches
alternatively,
the
Turbo
LED
will
be
the
only
accurate
indicator
of
the actual
mode:
the
LED
will
be on
in
Turbo mode
and
off in
Normal mode.
Turbo
LED
and
hardware switch
Most
8088—type
computer
cases
do not
have a
Turbo
LED
or
a
Turbo
hardware
switch. However, both
of
these
items
are
very useful
as
you probably
can already
see.
Therefore,
it
is highly
recommended that
you install both
in
your
system
if
you do not
already
have them. For more
information, refer
to
the
Panel
indicators
and
switches
section.
Using
software
in Turbo
made
Most
software, such
as
Lotus 1-2-3®,
dBase
lll®
and
many
other applications
run flawlessly
in
Turbo
mode.
However, you may
find
that
certain kinds
of
software,
like
Copy Writer®, runs
only
in
Normal mode.
20
Technical information
The system board
is
a double-sided printed
circuit
board using direct current. The power supply
is
connected
to
the
board
by
a
12—pin
connector. Other connectors are
for
a
control
panel, a speaker and a keyboard.
Eight 62-
pin
expansion slots are also mounted
on
the board.
The
l/O
channel'
Is
bussed across these
eight
l/O
slots.
An
eight-
-switch
Dual—
In- Line
Package
(DlP) switch
(SW1)
is
mounted
on
the board and can
be
read under
program control. The
DIP
switch provides
the system
soft-
ware
with
information
about the installed options,
how
much
storage
the system has, what type
of
display
adapter
is
installed,
what
operation modes are desired
when power
is
switched on
(c
color or black
and
white, 80-
or
40-character
lines)
and the number
of
diskette drives
anached.
The system board had
five
functions: the processor
subsystem and
its
support
elements, the Read
Only Mem-
ory (ROM)
subsystem, the
ReadNVrite
(RNV)
Memory sub-
system, the
integrated
l/O
adapters
and
the
l/O
channel.
The
heart
of
the
10MHz Turbo
system board
is
the
Intel® 8088-1
microprocessor.
This
processor
is
an
8—bit
external
bus
version
of
Intel®'s 16-bit 8086
processor and
is
software-compatible
with
the
8086. Thus,
the
8088 sup-
ports 16-bit
operations
including
multiply
and
divide
and
supports
20 bits
of
addressable
memory
(1
megabyte
of
storage).
21