Epson Apex 386SX/16 Canadian Product User Manual - Page 108

PPM-1630C 16MHz mini-80386SX main, 16MHz., PPM-1630C, 16MHz, 16MHz., <-&gt

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6-3 Entering 16MHz Turbo Mode The main advantage of the PPM-1630C 16MHz mini-80386SX mainboard over ordinary PC/AT mainboards is its dual clock system. This innovation makes it possible for your computer to operate at either of two clock speeds: 8MHz or 16MHz. Entering 16MHz Turbo Mode The PPM-1630C supports both a software and hardware switch to toggle between 8MHz and 16MHz (Turbo) modes. The two switches are set up using jumper J3 and are mutually exclusive. You must choose either software or hardware if you are setting up the board yourself. Software Turbo Switch When jumper J3 is covered with a jumper cap or is connected to a closed hardware Turbo switch, the speed can be toggled between Turbo and Normal from the keyboard. The clock speed when you turn the system on will be 8MHz (or 16MHz). To switch the speed to 16MHz (or 8MHz), do the following: press and hold down the control and alternate keys on the keyboard while you press the minus key. The Turbo LED on your panel, if you have one, will light. For more information on the Turbo LED, refer to the Connectors section. Hardware Turbo Switch If your hardware Turbo switch is connected to pins one and two of jumper J3, pushing the switch on and off will toggle between 8MHz Normal mode and 16MHz Turbo mode. 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. 10 Chapter 6: Appendix

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6-3
Entering
16MHz
Turbo
Mode
The
main
advantage
of
the
PPM-1630C 16MHz mini-80386SX main-
board
over
ordinary
PC/AT
mainboards
is
its
dual
clock
system.
This
innovation
makes
it
possible
for
your
computer
to
operate
at
either
of
two
clock
speeds:
8MHz
or
16MHz.
Entering
16MHz
Turbo
Mode
The
PPM-1630C
supports
both
a
software
and
hardware
switch
to
toggle
between
8MHz
and
16MHz
(Turbo)
modes.
The
two
switches
are
set
up
using
jumper
J3
and
are
mutually
exclusive.
You
must
choose
either
software
or
hardware
if
you
are
setting
up
the
board
yourself.
Software
Turbo
Switch
When
jumper
J3
is
covered
with
a
jumper
cap
or
is
connected
to
a
closed
hardware
Turbo
switch,
the
speed
can
be
toggled
between
Turbo
and
Normal
from
the
keyboard.
The
clock
speed
when
you
turn
the
system
on
will
be
8MHz
(or
16MHz).
To
switch
the
speed
to
16MHz
(or
8MHz),
do
the
following:
press
and
hold
down
the
control
<Ctrl>
and
alternate
<Alt>
keys
on
the
keyboard
while
you
press
the
minus
<->
key.
The
Turbo
LED
on
your
panel,
if
you
have
one,
will
light.
For
more
information
on
the
Turbo
LED,
refer
to
the
Connectors
section.
Hardware
Turbo
Switch
If
your
hardware
Turbo
switch
is
connected
to
pins
one
and
two
of
jumper
J3,
pushing
the
switch
on
and
off
will
toggle
between
8MHz
Normal
mode
and
16MHz
Turbo
mode.
Alternate
Use
of
Both
Switches
Both
the
hardware
and
the
software
switches
may
be
used
alternative-
ly,
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.
10
Chapter
6:
Appendix