While working on improving the handling of WWV messages I did some digital archeology and found that the propagation display (Ctrl-P) is a straight port of MICROMUF.PAS, a MUF/LUF tool from the 80s. It was originally written in Basic then translated to Pascal. Here one can still find both: Xs://archives.scovetta.com/pub/simtelnet/msdos/hamradio/ (replace X with http. I'm unable to post mails with links...)
I suggest to include the original credits to our source. The Pascal version compiles on a 3.7 MHz Z-80 board in 8 seconds and drawing the chart takes ~45 seconds. Not that what you'd want to do during a contest. Those were different days... For those interested in seeing CP/M and Turbo Pascal 3.01A in action here is a 2 min screen recording: X://ha5cqz.info.tm/Screencast_micromuf.mp4 At the end I swithed to TLF's Ctrl-P screen with the same settings for comparison. This page gives a good review of propagation prediction programs X://www.astrosurf.com/luxorion/qsl-review-propagation-software-dos.htm 73, Zoli
