More likely EGA or VGA with 16 or 256 available colors. CGA was only 4 and the colors were chosen by someone who really liked pink.
Still, there was probably some video mode somewhere that only had 8 colors.
Edit: I didn’t know teletype was not PC related. TIL.
This is not pc-related though. Teletext was information pages transmitted on UK terrestrial (analogue) television channels in the long-distant past.
I’ve always loved it. Here in Sweden it’s called text-tv.
Edit: Was supposed to say it’s but said was