This took a bit of effort but was very worthwhile! While pondering designing a VGA add-on for my BeanBoard I stumbled over parallel-RGB interfaces for TFT panels, and found Adafruit have a nice little controller board with an SPI interface. As I already have a GPIO on my board, I just had to figure out how to bit-bang SPI and then interact with the RA8875 chip

More details here: https://painfuldiodes.wordpress.com/2025/10/24/tft-display-for-z80-homebrew/