This reminds me of the Duo Adept[1], a full TTL computer with video output, keyboard input and a homebrew operating system. All built by a teenager in his spare time.<p>1: <a href="https:&#x2F;&#x2F;m.youtube.com&#x2F;watch?v=qYvr0b8jqbg" rel="nofollow">https:&#x2F;&#x2F;m.youtube.com&#x2F;watch?v=qYvr0b8jqbg</a>