Int 2F Fn 48C4  - PCed/assoc - Installation Check                          [-]

   AX = 48C4h
   BL = 00h

Return: AX = 0000h if installed
       BX = ASSOC resident segment
Program: ASSOC is a resident utility included as part of the PCED package which
     associated files with executable programs based on their extensions

Note:  chains if BL > 02h on entry

See Also: AX=48C0h,AX=48C4h,AX=48C5h/BL=01h,AX=48C5h/BL=02h