MS DOS API Wikipedia. The MS DOS API is an API which originated with 8. DOS and is used in MS DOSPC DOS and other DOS compatible operating systems. Most calls to the DOS API are invoked using software interrupt 2. INT 2. 1h. By calling INT 2. AH processor register and other parameters in other registers, one invokes various DOS services. DOS services include keyboard input, video output, disk file access, executing programs, memory allocation, and various other things. In the late 1. 98. DOS extenders along with the DOS Protected Mode Interface DPMI allow the programs to run in either 1.
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