Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

   ◄INT 21H Summary►  ◄Contents►  ◄Index►  ◄INT Instruction►
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You can perform all the functions below more easily with DOS2 functions.
The services below are documented so you can analyze code written for DOS1.
 
Hex #  Dec #     Name
0FH     15       Open File
10H     16       Close File
11H     17       Find First File
12H     18       Find Next File
13H     19       Delete File
16H     22       Create File
17H     23       Rename File
23H     35       Get File Size
29H     41       Parse Filename
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