I remember reading that in pc magazine, compute or some such 81-83 area he just flipped off to an interviewer who was harassing him on dos'es memory limits. I doubt he meant it and sounded annoyed by the response he gave. I doubt you will ever find a direct source, one the archives back then were nonexistent and 2 heck he could buy the reference to make it go away. Also I remember it as "no one will ever need more then 640k" when at the time 386-512 was the norm and 640 was a huge increase.