The first IBM PCs used ____ as an operating system.
A) MS-DOS
B) PC-DOS
C) Windows
D) IBM-DOS

Question

Quizplus · Accepted Answer

The first IBM PCs used PC-DOS (Personal Computer Disk Operating System) as an operating system. MS-DOS is also correct as it was a nearly identical operating system developed by Microsoft for other personal computers, but PC-DOS was specifically developed for the IBM PC. Windows did not come out until later and IBM-DOS is not a valid option.

The First IBM PCs Used ____ as an Operating System