In 1978, a tape-driven computer known as the Sharp MZ-80K was created. The MZ has a 2 MHz CPU, a massive 20 KB of RAM, and a built-in monochrome monitor. Just a few years later, in 1981, Yasushi Enari (Panda Precision), a high-school student, created a miniature MZ. Just recently, he took his old project and upgraded it using a Raspberry Pi Zero. He replaced the screen with an Adafruit colour TFT and added the Zero with some power circuitry. You can read more about the project and see build photos here. Thanks to Adafruit for spotting this one.