It does contain some features not yet present in the Windows version. The current compile is larger than the version released as a beta, but was done to allow users of 386-SX's to be able to run the software. It's not otherwise significantly different. A pif and icon are provided so that it can be launched from Windows. James Vogh has written a Herrig Telescope design program which will run on either a PC or a Mac.
Required parameters are only the desired aperture and focal ratio.
That's why it can run on either platform. Let's see, type qbasic , load herdesn.bas, run the program. You may want this package if the following applies. You wish to read the manual, you have a friend running an XT or 286, or you want access to the source code. The original program did not draw the system schematically, nor did it handle toroidal surfaces.