I have a Fortran application that runs under DOS. I am running Win XP Pro and every time I access the command prompt and try to run the program, I get a notice that an “Out of Memory” condition exists. I have 525 meg of memory and it is hard to belive that my program requires this. The size from the link map is 500K bytes. Therefore, my deduction is that the debug program that I am running under takes 35K, my program takes 500k and where is the other 512 Meg being taken? I understand that Win 95 has a true DOS environment and that Win XP has a simulated environment which leads me to believe Win XP is still taking a lot of memory, vs. Win 95 which may take considerably less. Anybody have insights on this? please let me know at s.w.kraft@netzero.net. Thanks, Sid Kraft.