en:docs:dos:api:int21:33:05
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—en:docs:dos:api:int21:33:05 [2020/12/09 06:31] (current) – created prokushev
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 +{{page>en:templates:dosint}}
 +
 +====== 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 [[http://www.cs.cmu.edu/~ralf/files.html|Ralf Brown Interrupt List Release 61]]
 +
 +{{page>en:templates:int}}
 +
 +{{page>en:templates:fapi}}
 +