A Raspberry Pico 2 microcontroller, installed into a Pimoroni VGA demo base. The software installed is the Pico MZ-80K, an emulator wot I wrote for the venerable Sharp MZ-80K.
https://files.mastodon.online/media_attachments/files/113/527/817/149/496/126/original/d7e9070e6f4e7012.jpg