INSTALLATIONS
18 MB896 User’s Manual
J2: Digital I/O
Signal Name Pin
Pin Signal Name
GND 1 2 VCC
OUT3 3 4 OUT1
OUT2 5 6 OUT0
IN3 7 8 IN1
IN2 9 10 IN0
J3: System Function Connector
J3 provides connectors for system indicators that provide light indication
of the computer activities and switches to change the computer status. J3
is a 20-pin header that provides interfaces for the following functions.
Hard Disk Drive LED
Reset Switch
Not Defined
ATX Power On Switch
Not Defined
Power LED
Speaker
Speaker: Pins 1 - 4
This connector provides an interface to a speaker for audio
tone generation. An 8-ohm speaker is recommended.
Pin # Signal Name
1 Speaker out
2 No connect
3 Ground
4 +5V
Power LED: Pins 11 - 15
Pin # Signal Name
11 Power LED
12 No connect
13 Ground
14 No connect
15 Ground