Table of Contents
Note: This API call is for DOS and Win16 personality only. Use Family API for portability.
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
| osFree Macro Library | |
|---|---|
| Video I/O | @SetMode @SetCurSz @SetCurPos @GetCur @SetPage @ScrollUp @ScrollDn @Scroll @GetChAtr @PutChAtr @PutCh @SetPalet @SetColor @SetDot @GetDot @WrtTTY @VideoState @GetMode @GetDisplay @GetVideoState @GetEGAInfo @Cls |
| Hardware info | @Equipment @MemSize |
| Serial I/O | @AuxInit @AuxSendChar @AuxRecieveChar @AuxStatus |
| Tape I/O | @TapeOn @TapeOff @TapeRead @TapeWrite |
| Keyboard I/O | @KbdStatus @CharIn @CharPeek |
| Printer I/O | @PrnPrint @PrnInit @PrnStatus |
| Disk I/O | @DskReset @DskStatus @DskRead @DskWrite @DskVerify @DskFormat |
| Date and Time | @SetTime @GetTime |
| Mouse | @MouInit @MouShowPointer @MouStatus @MouSetPos @MouSetMickey @MouRegion |
| Memory manager | @ModBlok SET_BLOCK |