With a bit more work (had to add rtscts flow control to null_modem), the graphics terminal (dvk_kcgd) is running. This board emulates a vt52, vt100 or vt220, and can run uploaded software (which is how vt220 emulator is done). Naturally, some of that software is game software
proof of concept -- 132-column mode with light background.
Demos, a Unix port for the DVK. Demos itself runs under SIMH for now, console is in MESS.