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INT 21 - DOS - SELECT DISK
        AH = 0Eh
        DL = new default drive number (0 = A, 1 = B, etc.)
Return: AL = number of logical drives
Notes:  under Novell NetWare, the return value is always 32, the number of
          drives that NetWare supports
        under DOS 3+, the return value is the greatest of 5, the value of
          LASTDRIVE= in CONFIG.SYS, and the number of drives actually present
        otherwise, the return value is the highest drive actually present
SeeAlso: AH=19h, AH=DBh