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Desktop Board Features
13
Input/Output (I/O) Controller
The SMSC LPC47M102 I/O controller features the following:
• Two serial ports
• One parallel port with Extended Capabilities Port (ECP) and Enhanced Parallel Port (EPP)
support
• Mouse and keyboard controller
• Diskette drive controller
• MIDI/Game port
• Fan control
Real-Time Clock
The desktop board has a time-of-day clock and 100-year calendar. A battery on the desktop board
keeps the clock current when the computer is turned off.
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NOTE
The recommended method of accessing the date in systems with Intel desktop boards is indirectly
from the Real-Time Clock (RTC) via the BIOS. The BIOS on Intel desktop boards contains a
century checking and maintenance feature that checks the least two significant digits of the year
stored in the RTC during each BIOS request (INT 1Ah). This reads the date and, if less than 80
(i.e., 1980 is the first year supported by the PC), updates the century byte to 20. This feature
enables operating systems and applications using the BIOS date/time services to reliably
manipulate the year as a four-digit value.
USB Support
The desktop board has two rear panel USB ports. Front panel USB support is available as an
option to provide an additional two USB ports. You can connect two USB peripheral devices
directly to the computer without an external hub. To attach more than two devices, connect an
external hub to either of the built-in ports. The desktop board supports the universal host
controller interface (UHCI) and takes advantage of standard software drivers written to be
compatible with UHCI.
✏
NOTE
Computer systems that have an unshielded cable attached to a USB port might not meet FCC
Class B requirements even if no device or a low-speed USB device is attached to the cable. Use a
shielded cable that meets the requirements for a full-speed USB device.