A Z80 DIY Modular Computer running my own operating system BBC Basic. Graphics commands supported by the OS. CPU Z80 8Mhz 32Kb Ram 32Kb Rom RS232 Serial port USB Keyboard in ps, 2 mode 7 LCD 800x480 with 18bit color (16 bits used by the cpu) so 65535 colors Code Schematics on GitHub: Web Site: