MS-DOS / PC DOS and some related disk operating systems use the files mentioned here. System Files: IO.SYS (or IBMBIO.COM): This contains the system initialization code and builtin device drivers; MSDOS.SYS (or IBMDOS.COM): This contains the DOS kernel.
MS-DOS / PC DOS and some related disk operating systems use the files mentioned here. System Files: IO.SYS (or IBMBIO.COM): This contains the system initialization code and builtin device drivers; MSDOS.SYS (or IBMDOS.COM): This contains the DOS kernel.
Source: Wikipedia "List of DOS system files" · CC BY-SA 4.0
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