The Raspberry Pi Zero is not a very large computer at all. The case for the Zero was $1 more than the board itself!
Right now I have two Raspberry Pi 2 computers and a Raspberry pi 0.
On The Zero I have the sdltrs TRS-80 emulator running.
There were a number of issues I had to go through and packages to update to make the app for Raspian OS. (And of course, now that I have done it, all my shell history has cleared before I could add it to my notes.) On the screen is the Great Wave game written long ago by friend Troy Lyndon.
On the Windows PC, I run this emulator from Matthew Reed. He has done a great job.
The whole array is watched from the RealVNC VNC Viewer.