Int 13 Fn 18  - Pu_1700.com - Installation Check                           [d]

   AH = 18h
   CX = 5055h ('PU')
   DL = 00h

Return: AX = 7570h ('up') if PU_1700 is installed
Program: PU_1700 is a BIOS enhancer from PU Service Systems which permits
     formatting diskettes at higher capacity (1.78M instead of 1.44M)

See Also: AX=057Fh/SI=324Dh"2M"