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AX = 3305h
Return:
DL = boot drive (1=A:,...)
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
Category: DOS Kernel - Int 21h - D
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