RBIL61 - INT 16 - Netroom PRENET - GET OLD INTERRUPT VECTORS {undocumented}

INT 16 U - Netroom PRENET - GET OLD INTERRUPT VECTORS                           
	AX = 5758h
	BX = 5858h
Return: CF clear
	DX:BX -> saved copy of interrupt vector table
InstallCheck:	call this function and compare BX against 5858h on return; if
	  it has changed, PRENET is installed
SeeAlso: AX=5758h/BX=5859h
Index:	installation check;Netroom PRENET