System information

System RAM

VSBC-6 Reference Manual Reference – 27

System RAM

OMPATIBLE

EMORY

ODULES

The VSBC-6 will accept one 168-pin DIMM memory module with the following characteristics:

• Size 8 to 256 MB

• Voltage 3.3 Volt

• Error Detection Parity or Non-Parity

• Error Correction ECC or Non-ECC

• Type EDO, 60 ns (all VSBC-6 revisions)

EDO, 60 ns or SDRAM, PC-66 or PC-100 (VSBC-6 rev 4.00 or later)

Note: Parity and ECC features are not supported in the BIOS.

CMOS RAM

LEARING

CMOS RAM

Jumper V4[2-3] is normally inserted to provide battery power to the CMOS RAM circuits. The

jumper can be briefly moved to position V4[1-2] to erase the contents of the CMOS RAM should

it become necessary to do so. Do not operate the board with the jumper in the erase position.

Note! The jumper should remain in position V4[1-2] for a full minute to properly erase

the CMOS RAM contents.

Real Time Clock

The VSBC features a year 2000 compliant, battery-backed 146818 compatible real time

clock/calendar chip. Under normal battery conditions, the clock will maintain accurate

timekeeping functions during periods when the board is powered off.

ETTING THE

LOCK

The CMOS Setup utility (accessed by pressing the [DEL] key during a system boot) can be used

to set the time/date of the real time clock.

Disk on Chip

Socket U22 will accept an M-Systems DiskOnChip (DOC) Flash Disk for non-volatile,

read/write data storage. The DOC can be configured as a boot device

NABLE

/ D

ISABLE

The DOC can be enabled or disabled through CMOS Setup by going into the Custom screen and

setting "64 K memory page at E000 "DOC" or "Disabled". When enabled, the DOC appears in

the upper memory region as an 64 K page frame from E0000h to EFFFFh.