Interrupt Vectors Used By DOS
| Interrupt vector | Description | Version | Notes |
|---|---|---|---|
20h |
Terminate program | 1.0+ | Implemented in DOS kernel |
21h |
Main DOS API | 1.0+ | Implemented in DOS kernel |
22h |
Program terminate address | 1.0+ | Return address in calling program |
23h |
Control-C handler address | 1.0+ | Default handler is in the command shell (usually COMMAND.COM) |
24h |
Critical error handler address | 1.0+ | Default handler is in the command shell (usually COMMAND.COM) |
25h |
Absolute disk read | 1.0+ | Implemented in DOS kernel, enhanced in DOS 3.31 to support up to 2 GB partitions |
26h |
Absolute disk write | 1.0+ | Implemented in DOS kernel, enhanced in DOS 3.31 to support up to 2 GB partitions |
27h |
Terminate and stay resident | 1.0+ | Implemented in COMMAND.COM in DOS 1.0, DOS kernel in DOS 2.0+ |
28h |
Idle callout | 2.0+ | Called by DOS kernel when waiting for input |
29h |
Fast console output | 2.0+ | Implemented by the builtin console device driver or a replacement driver like ANSI.SYS |
2Ah |
Networking and critical section | 3.0+ | Called by DOS kernel to interface with networking software |
2Bh |
Unused | ||
2Ch |
Unused | ||
2Dh |
Unused | ||
2Eh |
Reload transient | 2.0+ | Implemented in COMMAND.COM |
2Fh |
Multiplex | 3.0+ | Implemented in DOS kernel and various programs (PRINT, MSCDEX, DOSKEY, APPEND, etc.) depending on subfunction number |
Read more about this topic: MS-DOS API
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