>You did it with the 8515 at 8 Mhz ??, astonishing !!! >So the 89C51 or 52 could also work, right ?? I want to use this cause I know >it is available. >What is TAR FAT ?? Fat I know. >Bye >Javier TAR can be used as the only filesystem on a disk. Its like one giant tar file. Grant Btw, the intel C series is 1/4, so a 32MHz 89C51 is comparable to an 8MHz AVR. Grant