Installation guide
Appendix E – Setting BIOS Entries on the Duo Units 113
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What is the BIOS?
The Duo CPU Module is essentially a computer, and like any computer, it has a BIOS. The BIOS is section of
battery backed up memory which holds all the settings which determine how a computer should function.
When would I need to set the BIOS defaults?
You should not normally have to change any BIOS defaults for normal operation. However, sometimes, after a
number of years the small battery that holds this BIOS memory can go flat. If this happens, when a computer is
turned on after being off for a period of time, it will no longer know what settings it should use to operate.
If this happens, then first replace the battery with a new one of the same type, and then re-enter the BIOS
defaults. The battery model number is CR2032 3Volt Lithium.
Setting BIOS Defaults in the Duo Hardware Modules
If a Duo CPU Module loses battery power, it may be necessary to re-set the BIOS defaults before normal
operation can continue. In order to do this perform the following operation:
1. Plug in a keyboard into the one of the USB ports on the CPU module.
2. Re-boot the Duo CPU Module and press the DEL key when the message appears at the beginning of the boot
process.
3. This will display the System CMOS Setup screen as shown below.
4. Using the Arrow keys and the Page Up & Page Down keys, change the BIOS settings to be the same as the
screens below. The Optimized Defaults should be all the settings that are needed, however, the settings required
for normal operation are fully listed below. Review each screen and verify that the settings are specified as
below.
5. Once finished, press the F10 button to save the changes and re-boot the Duo Unit.
Note: If this problem re-occurs the next time that the Duo unit is turned off
overnight, then you will need to return the unit to your Computer Score
representative so that the battery can be replaced.
DO NOT attempt to replace the battery yourself. It cannot be replaced by
the end user and attempting to do so will void your warrantee.