CMOS RAM
CMOS RAM
C
LEARING
CMOS RAM
Jumper VS1 can be moved to position [1-2] for 30 seconds to erase the contents of the CMOS
RAM. Be sure to move the jumper back to position [2-3] for normal operation.
Note
Operation with the jumper in the erase position [1-2] will cut-off all battery power
to the CMOS RAM and Real Time Clock chip. The board will operate in this
condition, however, this will force the board to use the factory default parameters
as shown on page 7. For custom programming of the Factory Default Parameters,
please contact the Customization Department at VersaLogic.
CMOS Setup Defaults
The EPM-CPU-10 features the ability for users to modify the CMOS Setup defaults. This allows
the system to boot up with user defined settings from cleared or corrupted CMOS RAM, battery
failure, or battery-less operation. All CMOS setup defaults can be changed except the time and
date.
Warning -
If the CMOS Setup defaults are set in a way that makes the system unbootable and
unable for the user to enter CMOS Setup, the EPM-CPU-10 will need to be
serviced by the factory.
Real Time Clock
The
EPM-CPU-10
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.
S
ETTING THE
C
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.
EPM-CPU-10 Reference Manual
Reference – 23