Indeed, it looks deliciously like Ceefax: https://en.wikipedia.org/wiki/Ceefax
I might get up at 5am and stare at it while listening to some easy-listening music.
I might get up at 5am and stare at it while listening to some easy-listening music.
This is definitely based on the standard EGA/VGA text mode (originally 80x25 characters) used by DOS. Mode 0x10 IIRC.
This is also using the standard codepage 437, which includes the characters for single and double borders. You could also rewrite the symbol table to make custom characters, which is what Norton Utilities and others did.