TTL Retro computer runs 6502 and Z80 code. Has video, sound and filesystem. Runs a Windows-like OS. No microprocessor or FPGA.

https://hackaday.io/project/190345-isetta-ttl-computer

The builders used whatever was available on the black market; no two computers ever seemed to come out alike. Lucky owners fit their Cobras into cases from another Romanian ZX Spectrum clone, the HC. Others used manufactured metal or wooden boxes.

“I didn’t care about the case,” Moldovanu says. “Most of the time, my computer worked with its parts spread on my desk. If I broke it, I would fix it myself.”

In this closed Communist country with choice regulated by the state, Cobras gave their owners some feeling of independence and rebellion. “The fact that you could play the game you wanted, when you wanted, gave you the illusion of choosing for yourself,” Moldovanu says. Three decades later, he still knows by heart Highway Encounter, Chuckie Egg, and Nether Earth, which featured Isometric 3D Graphics, meaning that it was 2D, but looked 3D-ish. Moldovanu was amazed at the graphics, and so he began studying the algorithm to learn how it was possible to achieve them.

https://www.hackster.io/news/agustin-gimenez-bernad-s-logicanalyzer-turns-a-raspberry-pi-pico-into-a-4-24-channel-100msps-marvel-6674515a398f