MS-DOS File and Filetypes
A computer file created by an application running under the DOS operating system. is called an MS-DOS file. There are three main files of DOS. During the Booting process, the computer loads the operating system into its memory. DOS booting involves reading the following files into memory namely
- IO. SYS: A hidden executable binary file that processes instructions that tell the operating system (OS) how the computer is set up when it is booted or started. It contains the default MS-DOS device drivers (hardware interfacing routines) and the DOS initialization program.
- MSDOS. SYS: The MSDOS.SYS file is a hidden, system, read-only file created on the root of the boot drive. There are several configurations that can be changed using this file. Most values in the MSDOS.SYS are either 0 or 1, which is off or on.
- COMMAND.COM: COMMAND.COM is the default command-line interpreter for MS-DOS. It is the default user interface as well.COMMAND.COM is the command shell on MS-DOS and PC-DOS, as well as versions of Windows that depend on DOS. Gives users a command line interface to DOS as well as a way to run scripts called “batch files” with the .BAT file extension.
MS-DOS Operating System
IBM was looking for an operating system for their new line of personal computers. Bill Gates’s mother Marry M Gates served on the national board of United Way alongside the CEO of IBM. IBM got in touch with Bill Gates through his mother when he convinced IBM that his company Microsoft could deliver the new software for IBM’s personal computer. Bill Gates then bought an existing OS called 86-DOS also known as QDOS for Quick and Dirty Operating System. He then adapted QDOS to run on the new IBM computers and called the particular product as “Microsoft Disk Operating System”.