The term BIOS shadow is the copying of ROM contents to the RAM, where the information may be accessed more quickly by the CPU. This copy process is also known as Shadow BIOS ROM, Shadow Memory, and Shadow RAM.
BIOS shadowing is a technique used to improve the performance of a computer's BIOS (Basic Input/Output System). The purpose of BIOS shadowing is to copy the contents of the read-only memory (ROM) containing the BIOS code to a faster and more accessible RAM (Random Access Memory).
By copying the BIOS code from the slower ROM to the faster RAM, the computer can access the BIOS much more quickly, resulting in faster boot times and overall system performance. This technique was especially useful in older computers with slower ROM and limited RAM.
