INT 21h -List Viiew Link

Possible Functions of INT 21h

The first column contains the high-order nibble in Hex.
The first row contains the Low-order nibble in Hex.

  0 1 2 3 4 5 6 7 8 9 A B C D E F
0 Program Termination Keyboard Input Display Output       Direct Console I/O Character Output Unfiltered Character Input Without Echo Character Input Without Echo Display ASCIIZ String Buffered Keyboard Input   Flush Input Buffer   Set Current Disk  
1                   Get Current Disk Set Data Transfer Address          
2           Set Interrupt Vector         Get Date   Get Time      
3 Get MS DOS Version Number Terminate and Stay Resident       Get Interrupt Vector       Create Directory Remove a Directory Set Current Directory Create A File Open File Close A File Read File or Device
4 Write File or Device Delete A File Set File Pointer         Get Current Directory Allocate Memory Release Memory Modify Allocated Memory Block   Terminate with Output Code   Find First Matching File Find Next Matching File
5   Get PSP Address         Rename A File                  
6                                
7                                
8                                
9                                
A                                
B                                
C                                
D                                
E                                
F                                

INT 21h Function 4Ch. Click the Cell above to learn more about that function.