Along with some of my hair, teeth, hearing and sight I have lost considerable memory. Back in the 90's I played with Fractint without any problem, but I have not been able to remember "howto" just recently. Now I'm in business again, and without all the complex "sstools" statements recommended. This is the whole of my final file: [fractint] inside=0 map=maps\default.map ifsfile=ifs\fractint.ifs parmfile=pars\fractint.par lfile=lsystem\fractint.l formulafile=formulas\fractint.frm autokeyname=key\auto.key savename=gif_s I don't know why this works, but it's something to do with the way I'm setup in DOSBox. In the config file I set cycles="max", fullscreen="true" and added: [autoexec] mount c c:\fractl\ c:\ fractint.exe Without this autoexec the mounting commands must be typed in... with poor results. Fractint goes back into its snit-fit about pctools and, when allowed to continue, runs at its usual steady rate. Return to the DOSBox modifications and the program goes back into overdrive, and with no pctools problem. Something to do with all those "c's" ? Anyway I'm happy with my Fractint-dedicated DOSBox... don't have to understand it! During this investigation I discovered that Microsoft does not support *.hlp files in WIN 10. Navigation is ponderous, at least in my installation, and dragging files across the screen tortuous... sometimes taking 5 or 6 seconds for the mouse pointer to attach to the top of the file. Maybe it will improve. John W.