New hardware project - my computer desk

I have 5 to 7 computers on my desk at any given time. With literal, physical desktop space being sparse, I have decided to do something that I think most would find odd. I'm going to take my Atari and my C64 and put them in a tower.


I will need a mechanism that will allow the two boards to share a single keyboard and a way to possibly power each independently.


I'll leave my primary Tandy CoCo2 and TI-99/4A alone of course.

I also need a tape cassette cable for the Tandy Coco so I can backup and restore code to my file server.