en:docs:dos:api:int21:33:05

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

2018/09/07 07:04 · prokushev

Int 21H, AH=33H, AL=05H

Version

4.0 and higher

Brief

GET BOOT DRIVE

Family API

Input

    AX = 3305h

Return

DL = boot drive (1=A:,…)

Macro

Notes

This function does not use any of the DOS-internal stacks and may
         thus be called at any time.  It is directly dispatched from
         the INT 21h entry point with interrupts disabled.
      NEC 9800-series PCs always call the boot drive A: and assign the other
        drive letters sequentially to the other drives in the system
      this call is supported by OS/2 Warp 3.0, but not earlier versions of
        OS/2; it is also supported by Novell DOS 7

See also

Note


en/docs/dos/api/int21/33/05.txt · Last modified: 2020/12/09 07:31 by prokushev