INT 7F - Alloy NTNX, MW386 - GET LIST OF SHARED DRIVES
        AH = 07h
Return: ES:DI -> shared drive list (see below)
Note:   MW386 considers all fixed disks to be shared drives; only C and D will
          be returned as shared

Format of shared drive list:
Offset  Size    Description
 00h    BYTE    string length
 01h    BYTE    number of shared drives
 02h  N BYTEs   one byte per shared drive

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