Int 16 Fn 5758  U - Netroom Prenet - Get Old Interrupt Vectors             [m]

   AX = 5758h
   BX = 5858h

Return: CF clear
   DX:BX -> saved copy of interrupt vector table

Note:  the installation check consists of calling this function and comparing
     BX against 5858h on return; if it has changed, PRENET is installed

See Also: AX=5758h/BX=5859h
Index: installation check;Netroom PRENET