Int 2F Fn F800 U - Superstor Pro 2xon.com - Installation Check [d] AX = F800h CX = 4455h ("DU") DL = 45h ("E") Return: AL = FFh if installed ES:BX -> ASCII signature "Universal Data Exchange" Program: SuperStor is a disk-compression program by Addstor. Note: returns AX=0001h if AL is not 00h or 01h See Also: AX=1001h,AX=F801h