When did IBM released the first version of its disk operating system DOS version 1.0 ?
A. 1981
B. 1982
C. 1983
D. 1984
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The answer is A. 1981
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'IBM' released the 'first version of its disk operating system' DOS version 1.0 in the year 1981.
Option (A)
Explanation:
- A DOS short for the 'disk operating system' is a 'computer operating system' which can use a disk storage unit, such as a hard disk, floppy disk, or optical disc.
- DOS is a 'platform-independent system' which later became general shorthand for 'disk-based operating systems' on 'IBM PC' compatibles.
- DOS mainly consists of 'Microsoft's MS-DOS' and a re-branded 'IBM version' under the name 'PC DOS', both of which were brought in the year 1981.
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