In this series, I'll be building a video board using the same principles as the ZX80/81. At first' i'll be using a very simple design, but eventually, it will resemble the ZX80/81 more and more. Part 1: Z80 - Solo - (This video) Part 2: Hi-res display - Part 3: TEXT - Part 4: Display files - Part 5: A6 - Interrupt - Part 6: HSYNC - Part 7: ZX81 Slow mode - Extra 1: ZX81 16K RAM Expansion - Extra 2: ZX81 to ZX Spectrum -