PC-DOS

IBM PC DOS (full name: The IBM Personal Computer Disk Operating System) is a DOS system for the IBM Personal Computer and compatibles, manufactured and sold by IBM from the 1980s to the 2000s. The DOS INT 21h function 30h get DOS version returns OEM code 00h for IBM instead of FFh for Microsoft. This is relevant for DOS 7, because various features introduced in MS DOS 7 (a part of Windows 95) are not supported in PC DOS 7, and vice versa, e.g., M... More

IBM PC DOS (full name: The IBM Personal Computer Disk Operating System) is a DOS system for the IBM Personal Computer and compatibles, manufactured and sold by IBM from the 1980s to the 2000s. The DOS INT 21h function 30h get DOS version returns OEM code 00h for IBM instead of FFh for Microsoft. This is relevant for DOS 7, because various features introduced in MS DOS 7 (a part of Windows 95) are not supported in PC DOS 7, and vice versa, e.g., MS DOS 7 does not support REXX, and PC DOS 7 does not support FAT32. The IBM task force assembled to develop the PC decided that critical components of the machine, including the operating system, would come from outside vendors. This radical break from company tradition of in-house development was the key decision that made the IBM PC an industry standard. But it was done out of necessity, to save time. Microsoft was selected for the operating system. IBM wanted Microsoft to retain ownership of whatever software it developed, and wanted...

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