A USB flash stick is not hard to interface to if you use the Vinculum VNC1L... it gives you a simple set of commands to read/write the FAT filesystem via asynch or SPI. Still not quite an absolute beginner's project, but pretty close if you use one of Vinculum's pre-built modules.
can anybody explain me how to change a C Programm made for a CF, SD or MMC to a Programm for a kind of Flash memory using a parallel interface with the PIC (see the link below)?
Rq: I don't need a decoder or USB interface cause the ATJ2085 include them (the PIC 18F4525 will share with the ATJ2085* the use of the Flash memory (SAMSUNG k9f2G08U0M) in reading and writing)
..
can anybody explain me how to change a C Programm made for a CF, SD or MMC to a Programm for a kind of Flash memory using a parallel interface with the PIC.
Not much similarity there. I would start from scratch and develop a program that met a set of written requirements which you need to write. The sooner you get cracking the better off your project will be.