ZX Spectrum build video circuit.

Bring up for the video circuit. Part 1: https://youtu.be/u8TRJXLCfQo Part 2: This video Part 3: https://youtu.be/If8GkpuakHM Part 4: https://youtu.be/jdkaOuP_c5I Part 5: https://youtu.be/N36iWYcXBAE ZX80/ZX81 build https://www.youtube.com/playlist?list=PLjQDRjQfW-84WG47-5UjPz1BrXxc1acvd