MS-DOS API - Interrupt Vectors Used By DOS

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

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