The most common serial comms line graphics protocol evolved from the Tektronix 401x
storage scope displays, sometimes refered to as the "GS" protocol for
the escape sequence it used.
https://en.wikipedia.org/wiki/Tektronix_4010
There are tons of manuals on bitsavers about them.
Just about everyone in the graphics terminal business had to support Tek
protocol, including the company I worked for (AED).
On 9/16/18 8:01 AM, Carlo Pisani via cctalk wrote:
"Tektronix vector
graphics", but I have only found dead links =(