The ADM3A was slightly more than a dumb TTY; it supported direct cursor addressing despite being made of SSI TTL chips. It was the main platform for vi. I bought a used one at a government surplus auction and, many years later, wrote an emulator. Thanks to termcap/terminfo, most TUI programs work adequately on an ADM3A emulator.

No graphics, though, not even TRS-80-style pseudographics. Not even inverse video.