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 - https://youtu.be/pVQJxV9JCSE
Part 2: Hi-res display - https://youtu.be/T5yu_0K32s8
Part 3: TEXT - https://youtu.be/Y1mMUuR7wLs
Part 4: Display files - https://youtu.be/Lr5wi_q69Pw
Part 5: A6 - Interrupt - https://youtu.be/JHETqNwk7gs
Part 6: HSYNC - https://youtu.be/QPGE8JjC700
Part 7: ZX81 Slow mode - https://youtu.be/xIfiWr-CRmk