Specifications

The motherboard also supports laser servo (LS-120) drives. LS-120 technology allows

the user to perform read/write operations to LS-120 (120 MB) and conventional 1.44

MB and 720 KB diskettes. An optical servo system is used to precisely position a dual-

gap head to access the diskette’s 2,490 tracks per inch (tpi) containing up to 120 MB of

data storage. A conventional diskette uses 135 tpi for 1.44 MB of data storage.

LS-120 drives are ATAPI-compatible and connect to the motherboard’s IDE interface.

(LS-120 drives are also available with SCSI and parallel port interfaces.) Some versions

of Windows 95 and Windows NT operating systems recognize the LS-120 drive as a

bootable device in both 120 MB and 1.44 MB mode.

Connection of an LS-120 drive and a standard 3.5-inch diskette drive is allowed. The

LS-120 drive can be configured as a boot device if selected in the Setup program.

Real-Time Clock, CMOS RAM and Battery

The real-time clock is compatible with DS1287 and MC146818 components. The clock

provides a time-of-day clock and a multi-century 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 content. 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.

Super I/O Controller

The motherboard uses the NSC PC87351 controller which features:

• Single diskette drive interface

• ISA Plug-and-Play compatible register set

• Two serial ports

• FIFO support on both serial and diskette interfaces

• One parallel port with ECP and EPP support

• PS/2 style mouse and keyboard interfaces

• Intelligent auto power management, including:

Shadowed write-only registers for ACPI compliance

Programmable wake-up event interface

The Setup program provides configuration options for the I/O controller.