Which were connected to the very expensive machine that a whole household shared.

In mid-late 90s central Texas, a well-off family might have had one PC and a second phone line shared between Internet access and the kids, as well as a dot matrix printer or even an inkjet (ink was a LOT cheaper back then), but only the most indulged (or nerdy, spending their savings on that instead of driving expenses) kids would have had their own PCs.