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Bootloader

Code

IO.SYS

Posted on 5 September 202421 February 2026 by Peter Jones

IO.SYS is a hidden, system file that is loaded early in the boot process of DOS-based systems. It is essential for the operating system to function. This article looks at its structure and work towards reconstruction.

Posted in CodeTagged assembly, Bootloader, C, Code, DOS, MBR, MSDOS, refactor

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