After ignoring it since the 1980's, I dug out my old F4 two weeks ago, and started re-learning how to use it. Amazing how I forgot everything about it, but thanks to forums, the internet, Ken Rockell and both the user manual and a book on the F4, I'm starting to feel comfortable with it.
I just received my "MF-23 Multi Control" from KEH earlier today. Is there someplace where I can download and print the original instructions that came with it?
My understanding is that it can/will print image information (including the date) either "on" the image or between the frames. Since the F4 predates Exif files, I think this might be very useful in the future.
Over the past couple of weeks I had many questions come up, but this is the only question remaining (at least as of today).