Vig550B Motherboard Manual – Ver 1.0
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Note:
Computer systems that have an unshielded cable attached to a USB port may not
meet FCC Class B requirements, even if no device or a low-speed (sub-channel)
USB device is attached to the cable. Use shielded cable that meets the
requirements for high-speed (fully rated) devices.
IDE Support
The Vig550B Motherboard has two independent bus-mastering PCI IDE interfaces.
These interfaces support PIO Mode 3, PIO Mode 4, ATAPI devices (e.g., CD-ROM),
Ultra DMA/33, Ultra DMA/66, Ultra DMA/100 & Ultra DMA/133 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 single, 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 Vig550B 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
