DOS Fn 3305H: Get Boot Drive

                                                         Compatibility: 4.0+ 
 Expects: AX    3305H
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 Returns: DL    boot drive (1=A, 2=B, etc.)
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    Info: Returns with DL containing the number of the drive which was used
          to boot the system.

          You can use this to help locate CONFIG.SYS or AUTOEXEC.BAT or
          DBLSPACE.BIN, etc. (files that live in the root of the boot
          disk).

See Also: System Information Functions
          DOS Functions
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