8.2.12 System-Management Functions

MS-DOS also provides Interrupt 21h functions for such system-management tasks as setting and examining the system time and date, the state of the Verify flag, and the state of the CTRL+C check flag. The Verify and CTRL+C check flags control how MS-DOS responds to input from programs and users.

Following are the MS-DOS system-management functions:

Function Description Version

25h Set Interrupt Vector 1.0
2Ah Get Date 1.0
2Bh Set Date 1.0
2Ch Get Time 1.0
2Dh Set Time 1.0
2Eh Set/Reset Verify Flag 1.0
30h Get Version Number 2.0
3300h Get CTRL+C Check Flag 2.0
3301h Set CTRL+C Check Flag 2.0
3306h Get MS-DOS Version 5.0
35h Get Interrupt Vector 2.0
54h Get Verify State 2.0