- MicroPython-based framebuf with drawing primitives
- SSD1306 I2C OLED driver
- EPD154 SPI e-paper driver (refactored to use spi_device abstraction)
- ST7789 SPI TFT driver
- Mono framebuffers (vertical LSB, horizontal)
- Adafruit GFX font support
- 16-color palette for blitting
- Desktop test suite