A technique used to increase a computer's
speed by using high-speed RAM memory
in place of slower ROM
memory (RAM is about three times as fast as ROM). On PCs
, for example, all code
to control hardware devices
, such as keyboards
, is normally executed
in a special ROM chip
called the BIOS ROM
. However, this chip is slower than the general-purpose RAM that comprises main memory
. Many PC manufacturers, therefore, configure their PCs to copy
the BIOS code into RAM when the computer boots
. The RAM used to hold the BIOS code is called shadow RAM.
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