I like UNIX and video cards. I used real hardware video terminals (vt320, vt340) when I was in high school. I was a software developer that knows a lot about software. But hardware was mysterious for me. It had changed when I started tinkering with microcontrollers. Now I understand how these things works so I can make my own hardware for computers!
I want to use one atmega328p (in Arduino Nano) with a few additional parts.
Is that new?
There is a lot of projects that outputs video signal or VGA monitors. Protocol is well documented.
Existing projects are far from useful UNIX-terminals. Popular resolution for terminal is 80x25 characters, but 40x25 was used sometimes too.
There is a ChibiTerm. Looks better than my BSW-100. It using STM32 chip. https://hw-by-design.blogspot.com/2018/07/low-cost-vga-terminal-module-project.html
This terminal outputs VGA signal with the best character resolution among AVR MCUs.
What is different?
BSW-100 terminal can output 40x29 characters but with a single color and specially crafted font. It can be used as a real video terminal. Characters typed on the keyboard are transfered to PC (or router).