First off, I think this DOS program is only for PC's, so if you're using a Mac I'm not sure you can run it. (Ignore the 'Bad command or file name' message in the DOS window if you get it - it's only on screen for a moment anyway.) It's best to extract the zipped files to a specific folder that you create specifically for it.
Found this
cool little freebie to help with Trachtenberg's speed arithmetic methods.

Not the sharpest bulb in the drawer.