Nintendo had dial up modems and their own intranet in 37% of Japanese households in the mid 80s? How did I not know this was a thing.
That Wikipedia link says that the Famicom (NES) was in 37% of households. Nintendo only shipped 130,000 modems, a tiny percentage of the total Famicom units sold.
(There is a note that there were remakes of the horse race betting software for SNES and Dreamcast)