Int 2F Fn 0601  U - DOS 3+ Assign - Get Drive Assignment Table             [U]

   AX = 0601h

Return: ES = segment of ASSIGN work area and assignment table

Note:  under DOS 3+, the 26 bytes starting at ES:0103h specify which drive
     each of A: to Z: is mapped to.  Initially set to 01h 02h 03h....

See Also: AX=0600h