Your mandelbrot speedup is pretty cool stuff! Thank you!
And thank you for pointing out the run systax. It will be fixed in next version. :-)
Playing with V2, I've noted a small difference with GWBasic for the command AUTO. In GWBasic, if the generated line number is already used, I think there was a star displayed after the number, and hitting enter preserved existing line.
In TB, there is no visual hint that the generated line number is already used, and hitting Enter erases this line.
I've seen that, that's reactive, thanks!
Reading the doc 2.1 right now, TXTWINDOW example is "TXTWINDOW 0,20,79,29" but this causes "Illegal function call" error, since cols/rows are base 1, I guess it should be "TXTWINDOW 1,21,80,30". And on Windows, Files,W/Dir,W adds an extra new line at the end of each line (and I've learned it's not a good idea to run DIR,S on the root folder of a drive containing several hundred thousands of files since it can't be interrupted...)