ok i tried it with my raspberry pi 1 on a circa 2001 28" panasonic crt telly.

i made a mistake and used raspbian without X, so i couldn't actually make inputs to the game. but it wouldn't have mattered, because the update rate while it played the demo was slow as shit, about 3 fps like the person on github got on their modern tv. i forgot to actually check if the pi's cpu was maxed out or not, but i suspect it's a limitation of the teletext decoding circuitry, which is probably the exact same as used on modern tvs. unfortunately i have no other tvs to test with, so that's gonna be that.