Updated: Tuesday, February 18, 1997

Contents

• Motherboard Connectors
• Front Panel Connections
• Audio Connectors
• Back Panel Connections

Motherboard Connectors

Power Supply Connectors
When used with a power supply that supports remote power on/off, the motherboard can turn off the computer power via software control. The Powerman utility supplied for Windows 3.1x allows for soft-off as does the shutdown icon in Windows 95 Start menu. The BIOS will turn the computer power off when it receives the proper APM command from the OS. For example, Windows 95 will issue this APM command when the user selects "Shutdown the computer" option. APM must be enabled in the BIOS and OS in order for the soft-off feature to work correctly. If power to the computer is interrupted due to a power outage or the power cord being unplugged, when power is reapplied, the computer will return to the state it was in when the power was disconnected. If the computer was turned on when power was disconnected, the computer will turn back on when power is reapplied.

Front Panel Connections (J3A1, J2A1)
The TC430HX motherboard provides header connectors to support functions typically located on the chassis bezel.

Front panel features supported include:

• Speaker
• System Reset
• Sleep LED
• Hard Drive activity LED
• Infra-Red (IrDA) connector
• Sleep/Resume
• Power On

• Speaker
  The external speaker provides error beep code information during the Power-On Self Test, if the computer cannot use the video interface. Please note that the Yamaha OPL3 audio output, normally used with speakers plugged into the backpanel, cannot be redirected to this external speaker.

• Reset
  This header can be connected to a momentary SPST type switch that is normally open. When the switch is closed, the computer will hard reset and run POST.

• Sleep LED
  This header can be connected to an LED to provide a visual indicator for when the system power is turned on or when the system is in sleep mode. When the system is powered on, the LED will be continuously lit. When the system is in sleep mode, the LED will blink at 1 HZ.

• Hard Drive activity LED
  This header can be connected to an LED to provide a visual indicator for when an IDE hard drive connected to the onboard IDE controller is being read or written.

• Infra-Red (IRDa) Connector
  Serial port 2 can be configured to support an IrDA or Consumer Ir module via a front panel header connector. Once configured for IrDA, the user can transfer files to or from portable devices such as laptops, PDA's, 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 typically used for remote control of telephony and multimedia functions.

• Sleep / Resume
  When Advanced Power Management (APM) is activated in the BIOS and the Operating System's APM driver is loaded, Sleep mode (Stand-By) can be entered in one of three ways: an optional front panel "Sleep/Resume" button, a user defined keyboard hot key, or prolonged inactivity. The Sleep/Resume button is supported by a 2-pin header located on the front panel I/O connector. Closing the "Sleep" switch will generate an SMI (System Management Interrupt) to the processor which immediately goes into System Management Mode (SMM), the so called "Sleep" mode. 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 via a keyboard hot-key sequence, or by a time-out of the 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 re-activate the computer, or "Resume", the user must press the sleep/resume button again, or use the keyboard or mouse. Mouse activity will only "wake up" the computer if a mouse driver is loaded. While the computer is in Stand-By or "sleep" mode it is fully capable of responding to and servicing external interrupts (such as incoming FAX) even though the monitor will only turn on if a user interrupt (keyboard/mouse) occurs as mentioned above.

• Power On
  This header can be connected to a momentary SPST type switch that is normally open. When the switch is closed, the computer will power up and run POST. If the system is already powered up, closing the switch will power off the system.

Audio Connectors

CD-ROM Audio Input
A four pin connector is provided for interfacing the audio output stream from a CD-ROM reader into the audio subsystem mixer. This connector is compatible with the typical cable that is supplied with CD-ROM readers for interfacing to audio add-in cards.

Wave Table Upgrade
There are two different ways to provide hardware wavetable on this motherboard. The first is a manufacturing option to include the Yamaha OPL4 on the motherboard. The second is to use the 8-pin wavetable upgrade connector on the motherboard and install an ISA based wavetable upgrade card. This card fits into an ISA slot, and cables to the header such that it only uses the power pins of the ISA connector.

Telephony Connector (J1F3)

	Pin	Signal Name
	1	Ground
	2	Mono Out
	3	MIC In
	4	Key

Back Panel Connections
The back panel provides external access to PS/2 style keyboard and mouse connectors, two Universal Serial Bus (USB) connectors (if so equipped), one serial port connector, one parallel port connector, a VGA connector (if equipped with optional on-board graphics), a MIDI/game port connector, and the external audio jacks.

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