C.1.13 SuperIO

The SuperIO is a commercial, off-the-shelf component that controls the keyboard, diskette, and parallel port interfaces. It contains a DMA-driven diskette controller, two serial port controllers, an IEEE 1284 parallel port interface, and an IDE disk interface (not currently used). The SuperIO drives the various ports directly with some EMI filtering on the keyboard and parallel port signals. Support for mixed voltage modes and power management features for low power operation are also included. Features of the SuperIO include:

• Two independent serial ports used for keyboard and mouse

• N82077 diskette drive interface

• IEEE 1284 parallel port interface