Table of Contents

Note: This API call is for DOS and Win16 personality only. Use Family API for portability.

2018/09/07 05:04 · prokushev · 0 Comments

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

Text based on Ralf Brown Interrupt List Release 61

2018/09/04 17:23 · prokushev · 0 Comments