3.ATX power connectors (24-pin EATXPWR, 4-pin ATX12V)

These connectors are for an ATX power supply. The plugs from the power supply are designed to fit these connectors in only one orientation. Find the proper orientation and push down firmly until the connectors completely fit.

AM1I-A

ATX12V EATXPWR

 

DC DC

 

 

+3 Volts

 

 

 

 

GND

 

+12V +12V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+12

Volts

 

 

 

 

+5 Volts

 

 

 

 

 

 

 

 

 

+12

Volts

 

 

 

 

+5 Volts

 

 

 

 

 

 

 

 

+5V Standby

 

 

 

 

+5 Volts

 

 

 

 

 

 

 

 

 

Power OK

 

 

 

 

-5 Volts

 

 

 

 

 

 

 

PIN 1

 

GND

 

 

 

 

GND

GND GND

+5 Volts

 

 

 

 

GND

 

 

 

 

 

 

 

 

 

GND

 

 

 

 

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+5 Volts

 

 

 

 

PSON#

 

 

 

 

 

 

 

 

 

 

GND

 

 

 

 

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+3

Volts

 

 

 

 

-12 Volts

 

 

 

 

 

 

 

 

 

+3

Volts

 

 

 

 

+3 Volts

 

 

 

 

 

 

 

 

 

 

PIN 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AM1I-A ATX power connectors

•We recommend that you use an ATX 12V Specification 2.0‑compliant power supply

unit (PSU) with a minimum of 300W power rating. This PSU type has 24-pin and 4-pin power plugs.

•If you intend to use a PSU with 20-pin and 4-pin power plugs, ensure that the 20-pin power plug can provide at least 15 A on +12 V and that the PSU has a minimum power rating of 300W. The system may become unstable or may not boot up if the power is inadequate.

•DO NOT forget to connect the 4-pin ATX +12V power plug. Otherwise, the system will not boot up.

•We recommend that you use a PSU with higher power output when configuring a system with more power-consuming devices or when you intend to install additional devices. The system may become unstable or may not boot up if the power is inadequate.

•If you are uncertain about the minimum power supply requirement for your system, refer to the Recommended Power Supply Wattage Calculator at http://support.asus. com/PowerSupplyCalculator/PSCalculator.aspx?SLanguage=en-us for details.

4.LPT connector (26-1 pin LPT)

The LPT (Line Printing Terminal) connector supports devices such as a printer. LPT standardizes as IEEE 1284, which is the parallel port interface on IBM PC-compatible computers.

 

LPT

AM1I-A

AFD ERR# INIT# SLIN# GND GND GND GND GND GND GND GND

 

PIN 1

 

STB# PD0 PD1 PD2 PD3 PD4 PD5 PD6 PD7 ACK# BUSY PE SLCT

AM1I-A Parallel Port Connector

1-16

Chapter 1: Product introduction