en:docs:dos:api:int21:37:02

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

2018/09/07 07:04 · prokushev

Int 21H, AH=37H, AL=02H

Version

2.x and 3.3+ only

Brief

get availdev flag

Family API

Input

      AH = 37h
      AL = 02h get availdev flag

Return

AL = status

          00h successful
          FFh unsupported subfunction

DL = 00h \DEV\ must precede character device names

                         = nonzero \DEV\ is optional

Macro

Notes

all versions of DOS from 2.00 allow \DEV\ to be prepended to device
        names without generating an error even if the directory \DEV does
        not actually exist (other paths generate an error if they do not
        exist); DOS 2.x has an AVAILDEV= option in CONFIG.SYS to make \DEV
        mandatory
      although MS-DOS 3.3+, DR DOS 3.41+, and Novell DOS 7 accept these
        calls, they have no effect, and AL=02h always returns DL=FFh (except
        for Novell DOS 7, which leaves AX unchanged for both subfunctions)

See also

AX=3701h

Note

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
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
2018/09/04 19:23 · prokushev

en/docs/dos/api/int21/37/02.txt · Last modified: 2020/12/14 11:03 by prokushev