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AS1020C-3 User's Manual
ATX PS/2 Keyboard and
PS/2 Mouse Ports
The ATX PS/2 keyboard and the
PS/2 mouse ports are located on the
backplane. The mouse is the green
port. See the table on the right for
pin defi nitions.
PS/2 Keyboard and
Mouse Port Pin
Defi nitions
Pin# Defi nition
1 Data
2NC
3 Ground
4 VCC
5 Clock
6NC
PS_SMBUS
The PS_SMBUS header is for I
2
C,
which may be used to monitor the
status of the power supply, fans and
system temperature. See the table on
the right for pin defi nitions.
I
2
C Header
Pin Defi nitions
(PS_SMBUS)
Pin# Defi nition
1 Clock
2 Data
3 PWR Fail
4Gnd
5 +3.3V
Overheat LED
Connect an LED to the JOH1 header
to provide warning of chassis over-
heating. See the table on the right for
pin defi nitions.
Overheat LED
Pin Defi nitions (JOH1)
Pin# Defi nition
1 3.3V
2 OH Active
Power LED/Speaker
On JD1, pins 1, 2, and 3 are for the
power LED and pins 4 through 7 are
for the speaker. See the tables on the
right for pin defi nitions.
Note: The speaker connector pins are
for use with an external speaker. If
you wish to use the onboard speaker,
you should close pins 6 and 7 with a
jumper.
Speaker Connector
Pin Defi nitions (JD1)
Pin# Defi nition
4 Red wire, +5V
5 No connection
6 Buzzer signal
7 Speaker data
PWR LED Connector
Pin Defi nitions (JD1)
Pin# Defi nition
1 +Vcc
2 Control
3 Control