Here are three versions of the SIMUL family of codes with supporting files and some older documentation. I use the Mac version on OS versions up through Catalina, with a reported compilation problem on Big Sur. This version also is reported to work under LINUX, but I have not tried it. An old UNIX version is also provided which may run well under some platforms. Finally, I was provided with a Windows version of the older code simulps14, but I am not able to take responsibility for whether or not it works for you Windows users. Two old users manuals are also provided here (included in some tar files too).