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The system board provides two IDE ports:
a fast IDE port (the primary channel)
a standard IDE port (the secondary channel).
Each port supports two devices for a total of four IDE devices. The system board allows the connection of an
IDE CD-ROM reader for system configuration flexibility without the addition of a controller.
The fast IDE port features an enhanced IDE interface which supports up to 10 MB per second 32-bit wide
data transfers on the high-performance PCI local bus. (Standard IDE supports 2 MB to 3 MB per second on
the ISA bus.) The standard hard disk is connected to the fast IDE port (primary channel) for high
performance. The CD-ROM reader is attached to the standard IDE port (secondary channel).
I/O Ports
The system board features an enhanced parallel port, one buffered high-speed serial port, and two Universal
Serial Bus (USB) ports.
The enhanced parallel port supports Enhanced Capabilities Port (ECP) and Enhanced Parallel Port (EPP)
modes for devices that require ECP or EPP protocols. These protocols allow high-speed bi-directional
transfer over a parallel port and increase parallel port functionality by supporting more devices.
The one buffered high-speed serial port uses a fast 16550 UART which supports transfer rates up to 19.2
kilobytes (KB) per second. This port allows the installation of high-speed serial devices for faster data transfer
rates.
The two USB ports allow additional new plug and play serial devices without removing the system cover.
Simply plug the USB device into the port. The speed varies between 12 megabits per second (Mbps) for
printers and 1.5 Mbps for mice and keyboards. Up to 127 USB devices can be connected to the computer.
The combination of the enhanced parallel port, buffered serial port, and USB ports ensure optimum
performance for future peripheral devices and operating systems.
Sound System
Ethernet models have audio integrated on the system board based on the Yamaha OPL3-SA (YMF701) and
OPL4-ML (YMF704) hardware wavetable. The chip provides the following features.
®
Compatible with Sound Blaster Pro™, Sound Blaster™ 2.0, Ad Lib™, MPU-401, and Microsoft
Windows
Sound System™ for PC sound applications
Stereo jacks — microphone in, line in, line out
Built-in 16-bit sigma-delta stereo CODEC
Dual DMA channel and built-in FIFOs for full duplex simultaneous playback and record in 16-bit stereo
Programmable sample rate from 5.5 KHz to 48 KHz for recording and playback
6-bit (64 steps) master volume control
IMA-compatible adaptive differential pulse code modulation (ADPCM), A-Law, and u-Law
compression/decompression
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