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AN430TX SPECIFICATION UPDATE
23
14. Revision of Video Memory Address
In Table 34, Memory Map, the address ranges for Video memory and BIOS will be changed to 640K-812K
(decimal) and A0000-CAFFF (hex). This will also change the ranges for Available High DOS memory to
812K-896K (decimal) and CB000-DFFFF (hex). The following note will be added applicable to Video Memory
and BIOS:
Note: Applies only to boards with onboard video. Video memory usage for other boards is determined by the
add-in video card.
15. Change to Description of Manufacturing Options
The following will be added as the first paragraph of Section 1.2, Motherboard Manufacturing Options:
The following are manufacturing options. Not all manufacturing options are available in all marketing
channels. Please contact your Intel representative to determine what manufacturing options are available to
you.
16. Addition of Section Describing Real Time Clock
The following will be added as Section 1.8.5. Following sections will be renumbered as necessary:
1.8.5 Real-Time Clock, CMOS SRAM, and Battery
The real-time clock is compatible with DS1287 and MC146818 components. The clock provides a time-of-
day clock and a multicentury calendar with alarm features and century rollover. The real-time clock supports
256 bytes of battery-backed CMOS SRAM in two banks that are reserved for BIOS use.
The time, date, and CMOS values can be specified in the Setup program. The CMOS values can be returned
to their defaults by using the Setup program.
An external coin-cell battery powers the real-time clock and CMOS memory. When the computer is not
plugged into a wall socket, the battery has an estimated life of three years. When the computer is plugged in,
the 3.3 V standby current from the power supply extends the life of the battery. The clock is accurate to ± 13
minutes/year at 25 ºC with 3.3 V applied.