The only teletext I remember in the states was sent by WTBS Atlanta Ga.
It was carried on most CATV systems. It was built in to Zenith
"digital system 3" line of TV's. They also had a printer option. It worked
well & showed the future but the internet prevailed.
BTW "Digital System 3" sets were NTSC sets that were digitally processed.
They used a chip set from ITT. Toshiba, Panasonic, NEC & probably MGA
sold them in the US. Zenith by far sold the most. I only remember
one NEC, maybe 6 Toshibas & training on Panasonic sets.
73 Zeno
LFOD !