cool. thanks for the advice. i can write my sys program to fit in those memory constraints. are you still free to pass filenames and paths (ie. LOAD this file from CFFA) under prodos 1.0.1? i'm using large files (3meg) and using byte offsets, as well. guess there's really only one way to find out..... anyone out there have a shrinked version of PRODOS 1.0.1?