Note: This API call is for DOS personality only. Use Family API for portability.

2018/09/07 07:04 · prokushev

Int 21H, AH=0AH


1 and higher



Family API


AH = 0Ah
DS:DX -> buffer (see #01344)


buffer filled with user input


^C/^Break are checked, and INT 23 is called if either detected reads from standard input, which may be redirected under DOS 2+

if the maximum buffer size is set to 00h, this call returns immediately without reading any input

Format of DOS input buffer:

Offset Size Description
00h BYTE maximum characters buffer can hold
01h BYTE (call) number of chars from last input which may be recalled (ret) number of characters actually read, excluding CR
02h N BYTEs actual characters read, including the final carriage return

See also

AH=0Ch,INT 2F/AX=4810h


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
2018/09/04 19:23 · prokushev

en/docs/dos/api/int21/0a.txt · Last modified: 2020/12/07 08:25 by prokushev