Definition of "Marvin"

"Thank you the marketing division of the Sirius Cybernetic Corporation," said Marvin and trudged desolately up the gleaming curved corridor that stretched out before them. "Let's build robots with Genuine People personalities, they said. So they tried out with me. I'm a personality prototype. You can tell can't you?"

1979, Douglas Adams, The Hitch Hiker's Guide to the Galaxy: Chapter 11