This is fascinating, thank you for preserving this work!
Do you have more details on the machine used by your father to develop these utilities? what process did you follow to extract these from the 3.5mm floppy disk?
I got fortunate with the disks - I just bought a USB 3.5mm reader and hooked it up to my Ubuntu machine, and there the files were, no corruption that I can tell. I'm glad other people are also enjoying the find!