Intel ® 82802Ab Firmware Hub (Fwh); Input/Output (I/O) Controller; Real-Time Clock - Lenovo Aptiva Product Manual

Aptiva S Series 1G Product Guide


Support for USB


General purpose I/O


Power management logic


Support for the System Management Bus

Real-Time Clock

Support for AC '97 audio devices and modems
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Intel 82802AB Firmware Hub (FWH)
The FWH has these features:


System BIOS


System security and manageability logic that enables protection for storing and updating of
platform information


Random Number Generator (RNG) for use in security applications

Input/Output (I/O) Controller

The SMSC LPC47M102 ultra I/O controller handles the exchange of information between the
processor and external devices, such as a mouse, keyboard, or printer that are connected to the
computer. The 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 with support for one drive


MIDI/Game port


Fan control
Real-Time Clock
The desktop board has a time-of-day clock and 100-year calendar that will rollover to 2000 at the
turn of the century. A battery on the desktop board keeps the clock current when the computer is
turned off.
✏
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) to read 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.
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