I loaned the book from Uxbridge town library, Middlesex, UK in autumn 1988. I read (but never finished) the book in the 1980's where a man has dreams to build a computer. He draws all the schematics and builds it.
On powering it up he asks the question - Who Are You? (Or something like that.)
The computer replies that it is Satan, the Devil, Lucifer, or some-such.
The book goes on but I never finished it.
Does anyone happen to know the name and author of this book?