Jay wrote
I also recall their being a free-standing game version of the thing.
Nolan Bushnell, of Atari fame, built what he felt could be an arcade
version of Spacewar in 1970. He built it in his daughter's bedroom.
Bushnell licensed the design to a company (I can't remember the name)
that ended up building about 1500 or so of them, calling them
"Computer Space". They are extremely sought-after collector's items
today. I have no idea what hardware was in the machines.
Rick Bensene