I rebuild the VIC chip sound generation circuit.
Part 1: CPU - https://youtu.be/epuP5fAuRj0
Part 2: Raster generator - https://youtu.be/Qv5tEn72Luc
Part 3: Monochrome display - https://youtu.be/giVttGIXC1E
Part 4: Colour - https://youtu.be/R-qfziBnLFY
Part 5: Sound - https://youtu.be/zlknpv7dIDM
Part 6: Bitmapped Graphics - https://youtu.be/ENB3yXGg0oI
The schematic for this part of the build and the code to generate the EPROMs are available on GitHub
https://github.com/Turing6502/VIC20