Answer by Dmytro Sirenko for What is the need for BIOS ROM to be present on...
DOS and other real-mode operating systems used BIOS services heavily. Since real-mode of x86 processors is bound into 2^20 = 1Mb address space, vendors of i8086 systems decided that BIOS must be mapped...
View ArticleAnswer by Sam for What is the need for BIOS ROM to be present on the address...
AFAIK, this has mostly historical reasons. The program is stored on chip, but to run it, the code is loaded into RAM (BIOS shadow), where the CPU can directly fetch the instructions. This is especially...
View ArticleWhat is the need for BIOS ROM to be present on the address space on PC?
When an x86 PC boots, it starts executing a program called the BIOS, which isstored in non-volatile memory on the motherboard. The BIOS’s job is to prepare thehardware and then transfer control to the...
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