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Traditional motherboard stores BIOS code in EPROM. EPROM can only be erased by ultra-violet
(UV) light. If BIOS has to be upgraded, you need to remove EPROM from motherboard, clear by
UV light, re-program, and then insert back.
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The DoC is component certification standard of FCC EMI regulations. This standard allows DIY
component (such as motherboard) to apply DoC label separately without a shielding of housing.
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Flash ROM can be re-programmed by electronic signals. It is easier for BIOS to upgrade by a flash
utility, but it is also easier to be infected by virus. Because of increase of new functions, BIOS size
is increased from 64KB to 256KB (2M bit). AOpen AX5T is the first board to implement 256KB
(2Mbit) Flash ROM. Now flash ROM size is moving to 4M bit on AX6C (Intel 820) and MX3W (Intel
810) motherboard.
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FSB Clock means CPU external bus clock.
CPU internal clock = CPU FSB Clock x CPU Clock Ratio
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