Int 2F Fn 1981  U - Ibm Rom-dos V4.0 - Get ??? String                      [-]

   AX = 1981h
   DS:DX -> buffer for ???

Return: AL = status
       FFh if successful
       DS:DX buffer filled (refer to note below)
       81h on error

Note:  the first byte of the buffer is unchanged; depending on a byte in
     IBMBIO.COM, the remainder of the buffer is filled with either
     "C:\ROMSHELL.COM",0Dh or xxh,xxh,0Fh,"C:\ROMSHELL.COM",0Dh

See Also: AX=1980h,AX=1982h