History of The DOS API
The original DOS API in 86-DOS and MS-DOS 1.0 was designed to be functionally compatible with CP/M. Files were accessed using file control blocks (FCBs). The DOS API was greatly extended in MS-DOS 2.0 with several Unix concepts including file access using file handles, hierarchical directories and device I/O control. In DOS 3.1 network redirector support was added. In MS-DOS 3.31 the INT 25h/26h functions were enhanced to support hard disks greater than 32 MB. MS-DOS 5 added support for using upper memory blocks (UMBs). After MS-DOS 5 the DOS API was unchanged for the successive standalone releases of DOS.
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