Int 2F Fn 921E  U - Pc Tools V8.0 Drivemap - ???                           [R]

   AX = 921Eh
   ???

Return: ???
Program: DRIVEMAP is a redirector which allows drives on computers connected
     over the parallel or serial ports to appear as local drives

Note:  this function sets two variables to 24h each

See Also: INT 16/AX=FF70h