> I am actually looking for the Space Chaser game (1979). I wondered whether it
> was available as the arcade game or even simply the software to use on my home
> PC.

It's emulated by MAME. http://www.mame.net
Note: The colors and sound are still a bit off yet.
http://www.mame.dk/gameinfo/schaser/

However, you're on your own to find the ROMS. (generally illegal copies of arcade game software)

- Stiletto