I made a cheap, simple VT100 emulator that works with a cheap Bluepill development board. I managed to get the STM32F103C8T6 or CS32F103C8T6 variants to work. I designed a PCB for the emulator though that is not strictly necessary. The Bluepill plugs into a NTSC monitor, a PS/2 keyboard, and a serial device. The source code and firmware are provided. You can find it at
https://github.com/profdc9/OneChipTerminalThis should hopefully provide a simple, cheap way to add an interface to projects.
Dan