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A+ Workstation 4021A-T2 User's Manual
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.
ATX PS/2 Keyboard and PS/2
Mouse Ports
The ATX PS/2 keyboard and the
PS/2 mouse ports are located on the
IO backplane. The mouse is the top
(green) port. See the table on the right
for pin defi nitions.
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.
CD1 Header
The 4-pin CD1 header allows you to
use the onboard sound for audio CD
playback. Connect the audio cable
from your CC drive to this header.
See the table on the right for pin
defi nitions.
PWR LED Connector
Pin Defi nitions (JD1)
Pin#
Defi nition
1
+Vcc
2
Control
3
Control
Speaker Connector
Pin Defi nitions (JD1)
Pin#
Defi nition
4
Red wire, +5V
5
No connection
6
Buzzer signal
7
Speaker data
PS/2 Keyboard and
Mouse Port Pin
Defi nitions
Pin#
Defi nition
1
Data
2
NC
3
Ground
4
VCC
5
Clock
6
NC
Overheat LED
Pin Defi nitions (JOH1)
Pin#
Defi nition
1
3.3V
2
OH Active
Pin Defi nitions
Pin#
Defi nition
1
Right Signal
2
Ground
3
Ground
4
Left Signal
5-16
CD1
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