Int 2F Fn 920B  U - PC Tools V8.0 Drivemap - Set Drive Mapping             [R]

   AX = 920Bh
   BL = drive letter (41h ['A'] = A:, etc)
   CX = ??? (0000h removes mapping)

Return: AX = ??? or FFF8h on error

See Also: AX=9201h,AX=920Dh