MAGNUM ETX
Precautions
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BIOS & CMOS Memory
Please be aware that with personal computer products, it is possible to create configurations within the BIOS
make booting impossible. Unlike most personal computer products, the MAGNUM ETX stores the BIOS
settings in Flash memory rather than CMOS which allows these settings to be remembered even if there is no
battery present.
If settings are used which make the MAGNUM ETX unstable, then clearing the CMOS as in other personal
computers to return to defaults will not work. The only way to reset default BIOS settings is to enter BIOS at
boot time and Load Default Settings.
WARNING: If you are uncertain as to consequences of making specific changes to BIOS settings, then consult
Blue Chip Technology Technical Support for advice
Electromagnetic Compatibility
This product has been assessed operating in representative, standard configurations. As with any PC product,
however, final installation & configuration can vary significantly, and so the following guidelines are offered to
help ensure that compatibility is maintained.
All components added to a system should either carry appropriate equivalent levels of compliance, or
be tested for compliance as part of the final system, and should be installed in accordance with supplier
recommendations.
The external enclosure should be securely fastened (with standard lids and covers in place) to ensure
good metal-to-metal contact around the internal electronics
Any metal back plate must be securely screwed to the chassis of the computer to ensure good metal-to-
metal (i.e. earth) contact.
Metal, screened, connector bodies should be securely connected to the enclosure.
The external cabling to boards causes most EMC problems. It is recommended that any external
cabling to the board be totally screened, and that the screen of the cable connects to the metal end
bracket of the board or the enclosure and hence to earth. Round, screened cables with a braided wire
screen are used in preference to those with a foil screen and drain wire. Wherever possible, use metal
connector shells that connect around the full circumference of the cable screen: they are far superior to
those that earth the screen by a simple “pig-tail”.
The keyboard and mouse will play an important part in the compatibility of the processor card since
they are ports into the board. Similarly, they will affect the compatibility of the complete system. Fully
compatible peripherals must be used otherwise the complete system could be degraded. They may
radiate or behave as if keys/buttons are pressed when subject to interference. Under these
circumstances it may be beneficial to add a ferrite clamp on the leads as close as possible to the
connector. A suitable type is the Chomerics type H8FE-1004-AS.
USB cables should be high quality screened types.
Ensure that the screens of any external cables are bonded to a good RF earth at the remote end of the
cable.
Failure to observe these recommendations may invalidate the EMC compliance.
