Updated: Tuesday, December 31, 1996

Contents

• Motherboard Connectors
• Front Panel Connections
• Back Panel Connections

Motherboard Connectors
The AP440FX motherboard has onboard connectors supporting the following feature areas:

• Front panel features.
• Memory (SIMM) and expansion (PCI/ISA riser) sockets.
• Video features.
• Serial header.
• Audio features.
• Power connectors.
• Floppy and PCI IDE connectors.

Front Panel Connections
The motherboard provides connectors to support functions typically located on the chassis bezel. In addition, connectors are provided that support a cooling fan and a keyboard interlock. Front panel features supported include:

• Soft Power-On
• Sleep/Resume
• Infrared (IrDA) port
• Hard Drive activity LED
• Power LED
• Reset
• Speaker
• Keyboard lock

• Soft Power-On (SW_ON)
  This 2-pin header connects to a front panel power switch. When the switch is closed, the power supply turns ON. If a mechanical switch is connected to this header, it must apply a momentary ground to the SW_ON header pin in order to signal the supply to turn ON or OFF. Because of the motherboard’s internal debounce circuitry, the ground must be applied for at least 50ms. At least 2 seconds must pass before the power supply will recognize another ON/OFF signal (to prevent "double clicking").

• Sleep / Resume
  When Advanced Power Management (APM) is activated in the system BIOS and the Operating System’s APM driver is loaded, Sleep mode (Standby) can be entered in one of three ways: an optional front panel "Sleep/Resume" button, a user defined keyboard hot key, or prolonged system inactivity. The Sleep/Resume button is supported by a 2-pin header located on the front panel I/O connector. Closing the "Sleep" switch generates an SMI (System Management Interrupt) to the processor which immediately goes into System Management Mode (SMM).

  The front panel "Sleep mode" switch must be a momentary two pin SPST type that is normally open. The function of the Sleep/Resume button can also be achieved by using a keyboard hot-key sequence, or by a time-out of the system inactivity timer. Both the keyboard hot key and the inactivity timer are programmable in the BIOS Setup (timer is set to 10 minutes by default). To reactivate the system, or "Resume", the user must simply press the sleep/resume button again, or use the keyboard or PS/2 mouse. Mouse activity only "wakes up" the system if a mouse driver is loaded. While the system is in Standby or "sleep" mode, it is fully capable of responding to and servicing external interrupts (such as in-coming FAX) even though the monitor only turns on if a user interrupt (keyboard/mouse) occurs as mentioned above.

• Infra-Red (IRDa) Connector
  Serial port 2 can be configured to support an IrDA module with a 5 pin header connector. Once configured for IrDA, the user can transfer files to or from portable devices such as laptops, PDAs and printers using application software such as LapLink. The IrDA specification provides for data transfers at 115 Kbps from a distance of 1 meter. Consumer IR is also supported by the same connector.

• Hard Drive LED
  This 3-pin , keyed header can be connected to a front panel LED to indicate when hard drive activity is taking place. When hard drive activity is happening, the HDACTIVE pin (J2A1-15) goes low.

• Power-ON LED
  This 2-pin header can be connected to a front panel LED to indicate when power is applied to the motherboard. When the motherboard is powered up, power is applied to the PWRDRV pin (J2A1-20) to light the front panel LED.

• Reset
  This 2-pin header can be connected to a momentary SPST type switch that is normally open. When the switch is closed, the system performs a hard reset and runs POST.

• Speaker
  The speaker provides error beep code information during the Power-On Self Test (POST), if the system cannot use the video interface. Jumpering pins 26-27 (the last two pins of J2A1) enables the onboard speaker. To disable the onboard speaker (and allow use of the chassis speaker), remove the jumper from these pins. You can also disable the onboard speaker using a CMOS Setup option.

• Keylock Connector (J3A1)
  The Keylock connector pinout is listed below.

  		Pin	Signal Name
  		1	Ground
  		2	KB_LOCK
  		3	Ground
  

• Fan Connector (J4A1)
  The auxiliary fan connector (J4A1) is a 1-by-3 header that can accept either two-position (power and ground) or three-position (power, ground, and fan sense) fan plugs, as shown below.

Back Panel Connections
The back panel provides external access to PS/2 style keyboard and mouse connectors as well as one serial port, one parallel port, the video connector, and the audio I/O jacks, which are integrated on the motherboard. On the standard configurations, two USB connectors take the place of the COM2 serial connector. The drawing below shows the general location of the I/O connectors for the standard configuration.

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