Because i can't afford color, I decided to make the first version have a monochrome display, and have the Z80 run the video routines. I am using an Attiny85 for the sound chip, configured as an SPI slave. Also, I tried to make a pierce oscillator to clock the system, but i failed at it and used a crystal driver IC. The updated schematics and dev manual will be uploaded soon. There will be a color version. When i can afford it.