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Utility Connector (J7)
KEYBOARD/MOUSE INTERFACE
A standard PS/2 keyboard and mouse interface is accessible through connector J7.
This device is protected against ESD damage by IC
PROGRAMMABLE LED
The
The 5V supply for this feature is protected by a self resetting fuse. This 1 Amp fuse is used to protect KB, mouse, speaker, and LED.
The programmable LED is controlled by the PIO24 pin on the ÉlanSC520 microcontroller. It can be turned on and off by writing the word 0100h to MMCR offsets 0C3Ah and 0C36h, respectively.
The MMCR base address defaults to DF00:0 (segment : offset address).
The external LED is duplicated with an
Note: The LED is turned on by the BIOS during system startup. This causes the light to function as a "power on" indicator if it is not otherwise controlled by user code.
EXTERNAL SPEAKER
A miniature 8 ohm speaker can be connected between J7[49] and J7[50].
The 5V supply for this feature is protected by a self resetting fuse. This 1 Amp fuse is used to protect KB, mouse, speaker, and LED.
A normally open, momentary action
Two flexible
Reference – 30 |