Intel D2550MUD2 Technical product specification - Page 23
Real-Time Clock Subsystem, Legacy I/O Controller - driver
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Product Description For information about Obtaining AHCI driver The location of the SATA connectors Refer to Section 1.2, page 16 Figure 11, page 43 1.6 Real-Time Clock Subsystem A coin-cell battery (CR2032) 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 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 VSB applied. NOTE If the battery and AC power fail, custom defaults, if previously saved, will be loaded into CMOS RAM at power-on. When the voltage drops below a certain level, the BIOS Setup program settings stored in CMOS RAM (for example, the date and time) might not be accurate. Replace the battery with an equivalent one. Figure 1 on page 13 shows the location of the battery. 1.7 Legacy I/O Controller The Legacy I/O Controller provides the following features: • Two serial port headers • One parallel port connector with Enhanced Parallel Port (EPP) support • Serial IRQ interface compatible with serialized IRQ support for Conventional PCI bus systems • PS/2-style keyboard and mouse ports • Intelligent power management, including a programmable wake-up event interface • Conventional PCI bus power management support The BIOS Setup program provides configuration options for the Legacy I/O controller. For information about The location of the headers The serial port headers signal mapping Refer to Figure 11, page 43 Table 12, on page 45 23