I believe that there may be some significant differences in the DOS environment that DOS programs "see" between WinXP and Win98 (where you could actually boot into the Win98 version of DOS.) I've had a situation with fractals that *would* calculate successfully at 640x480 in Disk Video Mode, but become corrupted when two copies of FRACTINT.EXE were running (calculating different fractals) in two 32-bit WinXP DOS CMD windows at the same time. I seem to remember that I could have several fractals being calculated simultaneously in DOS fractint in separate DOS windows (on the Win98 Windows desktop) and they would all calculate correctly. When doing the same thing in WinXP I find that one fractal will corrupt another being calculated at the same time -- almost as if the two copies of Fractint in the two 32-bit WinXP DOS CMD windows were sharing some of the same memory. Does anyone have any comments or info about this? - Hal Lane ######################### # hallane@earthlink.net # #########################