Co-creator, Futurama, said: "I spent a good percentage of my high school years programming the Apple II Plus in 6502 assembly language, so I have fond memories of long nights alone with this chip. My greatest 6502 achievement was a video game I called Zoid that was played heavily by me and my father and no one else. Incidentally, Zoid incorporated digitized speech (me saying the word . Zoid ,. slowed down to make it mightier), which was pretty rare at the time. The digital audio for that single syllable used much more memory than the entire program. I tried to sell the game to Broderbund Software, but I knew I was in for bad news when the return letter they sent me started with a misspelling of my name."