V1.0 Vig625M Motherboard Manual
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USB device is attached to the cable. Use shielded cable that meets the requirements for
high-speed (fully rated) devices.
IDE Support
The motherboard has one independent bus-mastering PCI IDE interfaces. These
interfaces support PIO Mode 3, PIO Mode 4, ATAPI devices (e.g., CD-ROM), Ultra
DMA/66 & Ultra DMA/100 synchronous-DMA mode transfers. The BIOS supports logical
block addressing (LBA) and extended cylinder head sector (ECHS) translation modes.
The BIOS automatically detects the IDE device transfer rate and translation mode.
Programmed I/O operations usually require a substantial amount of processor
bandwidth. However, in multitasking operating systems, the bandwidth freed by bus
mastering IDE can be devoted to other tasks while disk transfers are occurring.
LS-120 Support
LS-120 MB Diskette technology enables you to store 120MB of data on a si
ngle, 3.5”
removable diskette. LS-120 technology is backward (both read and write) compatible
with 1.44MB and 720KB DOS-formatted diskette and is supported by Windows 95 and
Windows NT operating system.
The Vig625M board allows connection of an LS-120 compatible drive and a standard
3½” floppy drive. The LS-120 drive can be configured as a boot device before a floppy
drive, if selected in the BIOS setup utility.
NOTE
:
If you connect an LS-
120 drive to an IDE connector and configure it as the “A”
drive and configure a standard 3.5” floppy as “B” drive, the standard floppy must be
connected to the floppy drive cable’s “A” connector (the connector at the end of the
cable).
The BIOS setup utility can be configured to boot firstly from either the LS120 or standard
3½
” floppy drive.
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 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 (CR 2032) 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.
