IBM PC-DOS was a Disk
Operating System for the IBM Personal Computer. The original 1981 arrangement between
IBM and
Microsoft was that Microsoft would provide the base product and that both firms would work on developing different parts of it into a more powerful and robust system, and then share the resultant code.
MS-DOS and PC-DOS were to be marketed separately: IBM selling to itself for the
IBM PC, and Microsoft selling to the open market. However, at no time did IBM acquire the ownership of the
source code of the
operating system for its own
PCs.
ThinkPad products currently have a copy of the latest version of PC-DOS in their Rescue and Recovery partition. The final release, PC-DOS 2000, found its niche in the
embedded software market and elsewhere. It was released to correct issues with the
Year 2000 problem. Versions 7 and 2000 supported a
diskette format known as
XDF, which allowed for more data to be written to a standard floppy disk than usual.
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PERSONAL COMPUTER - DISK OPERATING SYSTEM [IBM]. PC-DOS
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