The working principle of the virtual chip is to manufacture the circuit on the surface of the semiconductor chip for calculation and processing.
The BIOS program is burned by the chip factory using a special method, the contents of the previous BIOS chip can only be read and can not be changed, and the user can only verify that the data written is correct and can not make any modifications.
Later, the chip slowly from PROM (Programmable ROM, Programmable ROM), EPROM (Erasable Programmable ROM, Erasable Programmable ROM), EEPROM (electric-eiasable programmable Read-Only Memory), all the way to System Home today's FLASHROM (fast erasable memory chip), We can already modify the data for FLASHROM in many ways, and even many motherboard manufacturers also provide BIOS upgrade programs and websites.