A bootstrap program is the small program that is executed by the BIOS when the computer powers on. All it does is find the kernel for an OS and loads it into memory, thereby starting the computer's operating system.
bootstrap
The OS is installed on the HD, just like any other program. The bootstrap process loads the OS from HD to main memory, where it is executed.
On most computer systems, a small piece of code known as the bootstrap program or bootstrap loader locates the kernel loads it into main memory and startsits execution. Some computer systems, such as PCs, use a two-step process in which a simple bootstrap loader fetches a more complex boot program from disk, which in turn loads the kernel. The bootstrap program can perform a variety of tasks. Usually, one task is to run diagnostics to determine with the booting steps. It can also initialize all aspects of the system, from CPU registers to device controllers and the contents of main memory. Sooner or later, it starts the operating system.
By first loading a small bootstrap program. The bootstrap program then loaded the OS.It is still done this way, except the bootstrap programon most modern computers is preloaded on ROM so it needs no special action on the part of the operator/user to load it as was needed on the early computers.Some early computers used a 2 stage bootstrap to simplify thing for the operator/user: the small bootstrap program loaded a larger more powerful bootstrap program, which then loaded the OS. This is not necessary with the bootstrap program in ROM, the large bootstrap program would be the one in ROM.
RAM - Random-Access Memory
The computer term bootstrap began as a metaphor in the 1950s. In computers, pressing a bootstrap button caused a hardwired program to read a bootstrap program from an input unit and then execute the bootstrap program which read more program instructions and became a self-sustaining process that proceeded without external help from manually entered instructions. As a computing term, bootstrap has been used since at least 1958 - now usually abbreviated to boot.
The bootstrap program should automatically load the operating system after a power outage or reset. The operating system would then load the remaining software.
The program file Emm386.exe
ROM Read Only Memory
Memory
Whenever the assembly program is to be executed, it has to be assembled again; Programs ...loads the first program to be run by the computer -- usually an operating system ...