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Function 0Eh (14) Select Default Drive
Sets the default drive and returns the number of logical drives in the
system.
On entry: AH 0Eh
DL Drive number (0=A, 1=B, etc.)
Returns: AL Number of logical drives in system
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Notes: The floppy disk on a single floppy system is counted
as two logical drives, A: and B:.
DOS 3 and later versions report a minimum of 5
logical drives, unless the CONFIG.SYS file contains
a LASTDRIVE statement.
To determine the number of physical floppy drives on
the system, use Interrupt 11h (17). To determine the
number of physical hard drives, use Interrupt 13h,
Function 8.