User`s guide

Installations

•

u CN4: Miscellaneous Connector

The Miscellaneous connector is a 20-pin header that provides interfaces

for the following functions.

Power LED

PC Speaker

Keylock

Reset Switch

ATX Power Input

Hard Disk LED

1 11

10 20

ATX Power On Switch

l Speaker: Pins 11 - 14

This connector provides an interface to a speaker for audio tone

generation. An 8-ohm speaker is recommended.

Pin #

Signal Name

11 Speaker out

12 No connect

13 No connect

11 14

14 +5V

l Power LED and Keylock: Pins 11 - 15

The power LED indicates the status of the main power switch. The keylock

switch, when closed, will disable the keyboard function.

Pin #

Signal Name

1 +5V

2 No connect

3 Power LED#

4 Keylock#

1 4 5 Ground