Table of Contents
Note: This API call is for DOS personality only. Use Family API for portability.
Int 21H, AH=31H
Version
2 and higher
Brief
TERMINATE AND STAY RESIDENT
Family API
Input
AH = 31h AL = return code DX = number of paragraphs to keep resident
Return
never returns
Notes
the value in DX only affects the memory block containing the PSP; additional memory allocated via AH=48h is not affected the minimum number of paragraphs which will remain resident is 11h for DOS 2.x and 06h for DOS 3.0+ most TSRs can save some memory by releasing their environment block before terminating (see #01378 at AH=26h,AH=49h) any open files remain open, so one should close any files which will not be used before going resident; to access a file which is left open from the TSR, one must switch PSP segments first (see AH=50h)
See also
AH=00h,AH=4Ch,AH=4Dh,INT 20,INT 22,INT 27
Note
Text based on Ralf Brown Interrupt List Release 61
DOS API | |
---|---|
Process manager | INT 20H, INT 21H: 00H, 25H, 26H, 31H, 34H, 35H, 4CH, INT 22H, INT 27H, INT 28H |
File manager | INT 25H, INT 26H, INT 21H: 0DH, 0EH, 0FH, 10H, 11H, 12H, 13H, 14H, 15H, 16H, 17H, 19H, 1AH, 1BH, 1CH, 21H, 22H, 23H, 24H, 27H, 28H, 29H, 2EH, 2FH, 32H, 3305H, 36H, 39H, 3AH, 3BH |
Character Device I/O | INT 29H, INT 21H: 01H, 02H, 03H, 04H, 05H, 06H, 07H, 08H, 09H, 0AH, 0BH, 0AH, 0CH |
Signals | INT 23H, INT 24H, INT 21H: 3300H, 3301H, 3302H |
Memory manager | |
Date and Time | INT 21H: 2AH, 2BH, 2CH, 2DH |
Misc | INT 21H: 30H, 3306H, 3700H, 3701H, 3702H, 3703H |
NLS | INT 21H: 3303H, 3304H, 3800H, 3801H |