(via What is Dos Operating System? (DOS) Definition and Types)
MS-Dos is commonly known as disk operating system. Dos comes in two types msdos and pc-dos which was primarily developed for IBM.

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(via What is Dos Operating System? (DOS) Definition and Types)
MS-Dos is commonly known as disk operating system. Dos comes in two types msdos and pc-dos which was primarily developed for IBM.