When I was in the ham club at Michigan State knew a student who built a code reader for his Masters. He wrote the code for the university's IBM 360, inputting it with punch cards. My memory is that it worked quite well.
Now you can get one that runs on your cell phone, that's progress!
I've got a Morse code decoder and encoder running on a Rasberry Pi, it both sends the ident for my WSPR beacon and records contacts of other beacons. It does better on non-human encoded Morse which is more consistent than a human but still does pretty well.
Now you can get one that runs on your cell phone, that's progress!