Microsoft P4X4-ALH manual Speaker and Power LED Connectors, External Connectors

Hardware Installation

2.7. Speaker and Power LED Connectors

2.7.1. Speaker Connector (SPKR)

Connect your chassis speaker to this four-pin connector. It allows you to hear systems beeps and warnings sound.

PIN 1

2.7.2.Front Panel Power LED PIN 1

(PWRLED)

The chassis power LED connector can be connected to the four-pin connector. When you turn your system on, this LED will also be turned on.

SPKR

Speaker	Speaker	Speaker
+5V DC Signal	Signal	Signal

+5V DC Ground Ground NC

PWRLED

Top View of the Speaker and Power LED Connectors

2.8. External Connectors

2.8.1. PS/2 Keyboard Connector

Connector:	CN1 (K/B)
Type:	6 pin female

This connector only supports a PS/2 keyboard plug. If you have a standard AT size (large DIN) keyboard plug, you need to use a mini DIN adapter.

2.8.2. PS/2 Mouse Connector

Connector:	CN2 (M/S)
Type:	6 pin female

This connector only supports a PS/2 mouse plug. If a PS/2 mouse is de- tected then IRQ 12 will be directed to CN2.

2.8.3. Serial Port Connectors

Connector: CN3 (COM 1)/CN4 (COM2)

Type: 9 pin male

One serial port is available for a mouse and other serial devices. (I/O addresses used are 3F8H/2F8H/3E8H/2E8H and IRQ3/IRQ4, selected by CMOS setup.)

The P4X4-ALH Mainboard

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