The Tektronix
4052 and 4006 (and presumaby 4051 and 4012) do this.
These machines all have storage-tube vector displays, but when you want
to display text, scan a little dot matrix of the character. [...]
In all of these machines they do *not* send characters to the monitor.
They send dots or vectors. Just like in any character based terminal,
there is a circuit that takes a character and turns it into a pixel or
vector representation and *that* is sent to the monitor. Monitors
don't eat characters as input.
Not unless they are a Charactron -- which was mentioned earlier. Wikipedia has a good
description.
paul