J21 Chassis Intrusion Connector; J38 Speaker Connector - American Megatrends MegaPlex II System Manual

Step 7 Attach Connectors,
J35 Keyboard Lock J35 is a five-pin single-inline berg that is attached via a cable to the
keyboard lock connector. The computer chassis may not include the keyboard
lock and Power LED on a single connector. The keyboard lock allows you to
lock the keyboard.
J4 Keyboard Frontside Header J4 is an extension of the keyboard/mouse connector and can be
used for additional frontside keyboard and mouse sockets. The pinout is:
Pin Signal Description
1 Keyboard Data
2 Keyboard Clk
3 Keyboard GND
4 +5 V
5 Keyboard GND-2
J38 Speaker Connector J38 is a four-pin single-inline berg attached via a cable to a standard
system speaker. AMIBIOS signals hardware problems through the speaker.
J21 Chassis Intrusion Connector J21 is a 2-pin berg which should be connected by a cable to a
NC (Normally Closed) switch on the chassis. The internal circuitry, when
activated, monitors the state of the chassis, and informs the administrator if the
chassis is opened.
38 Megaplex Quad Pentium II Xeon PCI ISA System Guide
Continued
Pin Description
1 LED power
2 LED power
3 GND
4 Keyboard Lock
5 GND
Pin Signal Description
6 Mouse Data
7 Mouse Clock
8 Keyboard GND
9 +5 V
10 Keyboard GND-2
Pin Description
1 Data Out
2 GND
3 N/C
4 GND
Cont'd