There's no date on that particular book, but if the year weren't already incorporated into the computer's name I think we might still have been able to deduce it from internal evidence. For example, one of the programs is called "Biorhythm", and usefully allows you to align your intellectual, emotional and vital cycles. In the '70s, my father owned a mechanical biorhythm calculator much like this one (I wonder what became of it?), but it's a craze that fell precipitously out of fashion at the turn of the decade, as this ngram illustrates.
Another program, "Vols", is described as "a useful conversion program that will tell you how many glasses of beer you can drink after we go metric, and still drive home". In fact, the nightmare world in which British beer was sold in litres never came to pass (it has actually been illegal to use that measure since 1988), giving this program an alternative-history frisson similar to that provided by Went the Day Well?. The casual incitement to drink driving, like the fag-proffering Shirley Temple lookalike in Come Back Alive, also gives a shock to the system, of the past-is-a-foreign-country variety. (Gene Hunt isn't fiction, kids. Nor is it a cutesy name for the Human Genome Project.)
On which note, my mother told me today of a game she used to play in the 1920s with her elder brother and sister, in which they would take up a loose floorboard in their house and crouch in the dark, confined space beneath. They called it "Togoland": make of that what you will.