This description provides an overview of the history of the IBM PC, which was first released in 1981. It was the first commercially available personal computer, and it was revolutionary for its time. It featured an Intel 8088 processor, 16KB of RAM, and a 5.25 inch floppy disk
IBM PC DOS, also known as IBM DOS or PC DOS, is a discontinued disk operating system for the IBM Personal Computer, its successors, and IBM PC compatibles. It was sold by IBM from the early 1980s into the 2000s. Developed by Microsoft, it was also sold by that company to the open market as MS-DOS. Both operating systems were identical or almost identical until 1993, when IBM began selling PC DOS 6.1 with its own new features. The collective shorthand for PC DOS and MS-DOS was DOS, which is also the generic term for disk operating system, and is shared with dozens of disk operating systems called DOS.