Installing and Replacing Desktop Board Components
45
Pin
Standard Signal Name
ECP Signal Name
EPP Signal Name
23 PERROR
PE,
ACKREVERSE#
PE
24
GROUND GROUND GROUND
25
SELECT SELECT SELECT
26
KEY (no pin)
KEY (no pin)
KEY (no pin)
Alternate Front Panel Power LED Header
Figure 20, E shows the location of the alternate front panel power LED header. Pins 1
and 3 of this header duplicate the signals on pins 2 and 4 of the front panel header. If
your chassis has a three-pin power LED cable, connect it to this header. Table 9
shows the pin assignments for the alternate front panel header.
Table 9. Alternate Front Panel Power LED Header Signal Names
Pin Signal
Name
In/Out
1
Front panel LED+
Out
2 No
pin
3
Front panel LED-
Out
Front Panel Header
Figure 20, F shows the location of the front panel header. Table 10 shows the pin
assignments and signal names for the front panel header.
Table 10. Front Panel Header Signal Names
Pin Description
In/Out Pin Description
In/Out
Hard Drive Activity LED
Power LED
1
Hard disk LED pull-up to +5 V Out
2
Front panel LED+
Out
3
Hard disk active LED
Out
4
Front panel LED-
Out
Reset Switch
On/Off Switch
5 Ground
6 Power
switch
In
7 Reset
switch
In
8 Ground
Power
Not Connected
9 Power
Out 10
No
pin
NOTE
When connecting individual wires from your chassis front panel to the front panel
header, be sure to observe the connection polarity. Positive wires are usually
solid color and negative wires are usually white or striped.