SN 30414 belongs to Neal Wilson.
The picture below is just a generic 2 Player Computer Space image, I have not heard back from Neal yet regarding his machine. He posted a message on the Google discussion groups back in 2002.
I tried emailing Neal to get more information about his machine, but his email address wilcafe@execpc.com seems to be inactive.
If he ever sees this site, I hope he contacts me.