Older operating systems usually included this particular feature as a means of copying the BIOS for easy retrieval when the system was turned on, and sometimes even when specific tasks were being performed during the session. The purse of shadow memory is to protect the system from possible damage to the read-only memory (ROM) that is a part of the overall system configuration. Other operating systems do not require the use of this type of memory, and may even often users the option of shutting down the duplicate memory as a means of allocating resources elsewhere. Depending on the type of operating system used, the shadow memory may be used at startup and at certain times during the operation of the device. This duplicate or shadow memory reserve is then housed in a protected area of the systems random access memory or RAM, making it easy to retrieve the copy when and as needed.
Also known as shadow RAM, shadow memory is the essentially a duplication of the routines inherent in the basic input/output operating system or BIOS of a computer system.
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