None, it"s a dramatic record album, not a book! Danny Dunn and the Homework Machine was the full title. last seen in a record dept. in a Great Eastern store around l972. nobody ever bought this stuff. from cover illustrations, the machine resembled a Linotype or maybe a very early centralized traffic control machine used to run and monitor, say, subway or RR signal operations. many flashing lights, etc. My guess the story came out in the fifties when computers were remote and somewhat exotic, not everyday appliances like this one being used at the library. It was not, by the way, called a computer.
The Mightiest Machine has 228 pages.
The War Machine has 338 pages.
The Preserving Machine has 317 pages.
The Meme Machine has 264 pages.
The Myth of the Machine has 1352 pages.
The God Machine - comics - has 160 pages.
The Machine God Laughs has 134 pages.
Machine Man - novel - has 288 pages.
The Technicolor Time Machine has 190 pages.
Lord Kelvin's Machine has 262 pages.
The Winter of Frankie Machine has 320 pages.
The Republican Noise Machine has 432 pages.