tty and video displays

[emanuel stiebler]

On 2020-12-14 05:41, Brent Hilpert via cctalk wrote:
> On 2020-Dec-14, at 1:26 AM, ben via cctalk wrote:
>> Often for data input one could use over strike characters for input. Not EQ might be = BS | Did any video display terminals
>> repeat the same effect?
> 
> Yes. Coincidentally I've just been refurbishing one - a Teleray 3931.
> It's an ASCII/APL terminal, overstriking was included for the APL mode.
> 
> 	http://madrona.ca/e/teleray3931/index.html
> 
> Note the screenshots in APL mode.

Is it really an overstrike? They look simply like different characters.
At least, I didn't (probably missed it) how they can be generated out of
the available ones...