1200 bps didn't really show up as something people could buy until the early 1980s, however. In the mid 1970s if you had a 1200 bps modem it would be equivalent

1200 bps didn't really show up as something people could buy until the early 1980s, however. In the mid 1970s if you had a 1200 bps modem it would be equivalent today to the cost of having a cisco or juniper router with several ports of 100GbE interface in your house. They were in use for university mainframe/minicomputer data links and such.