While DOS does rely on the BIOS for low-level operations (especially in real mode), it is still an independent operating system. The BIOS provides essential ser

While DOS does rely on the BIOS for low-level operations (especially in real mode), it is still an independent operating system. The BIOS provides essential services such as disk access, keyboard input, and screen output, but DOS has its own file system, command interpreter, and APIs. The big missing feature preventing the UEFI shell from being a modern DOS is the lack of multitasking. DOS didn't support this very well, but it did have the concept of TSRs. The UEFI shell has no equivalent.